# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Nebula, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import collections
import copy
import logging
from operator import attrgetter
import sys
from django import forms
from django.http import HttpResponse
from django import template
from django.conf import settings
from django.core import urlresolvers
from django.template.defaultfilters import truncatechars
from django.template.loader import render_to_string
from django.utils import http
from django.utils.datastructures import SortedDict
from django.utils.html import escape
from django.utils.http import urlencode
from django.utils.translation import ugettext_lazy as _
from django.utils.safestring import mark_safe
from django.utils import termcolors
from horizon import conf
from horizon import exceptions
from horizon import messages
from horizon.utils import html
from .actions import FilterAction, LinkAction
LOG = logging.getLogger(__name__)
PALETTE = termcolors.PALETTES[termcolors.DEFAULT_PALETTE]
STRING_SEPARATOR = "__"
[docs]class Column(html.HTMLElement):
""" A class which represents a single column in a :class:`.DataTable`.
.. attribute:: transform
A string or callable. If ``transform`` is a string, it should be the
name of the attribute on the underlying data class which
should be displayed in this column. If it is a callable, it
will be passed the current row's data at render-time and should
return the contents of the cell. Required.
.. attribute:: verbose_name
The name for this column which should be used for display purposes.
Defaults to the value of ``transform`` with the first letter
of each word capitalized.
.. attribute:: sortable
Boolean to determine whether this column should be sortable or not.
Defaults to ``True``.
.. attribute:: hidden
Boolean to determine whether or not this column should be displayed
when rendering the table. Default: ``False``.
.. attribute:: link
A string or callable which returns a URL which will be wrapped around
this column's text as a link.
.. attribute:: allowed_data_types
A list of data types for which the link should be created.
Default is an empty list (``[]``).
When the list is empty and the ``link`` attribute is not None, all the
rows under this column will be links.
.. attribute:: status
Boolean designating whether or not this column represents a status
(i.e. "enabled/disabled", "up/down", "active/inactive").
Default: ``False``.
.. attribute:: status_choices
A tuple of tuples representing the possible data values for the
status column and their associated boolean equivalent. Positive
states should equate to ``True``, negative states should equate
to ``False``, and indeterminate states should be ``None``.
Values are compared in a case-insensitive manner.
Example (these are also the default values)::
status_choices = (
('enabled', True),
('true', True)
('up', True),
('active', True),
('on', True),
('none', None),
('unknown', None),
('', None),
('disabled', False),
('down', False),
('false', False),
('inactive', False),
('off', False),
)
.. attribute:: display_choices
A tuple of tuples representing the possible values to substitute
the data when displayed in the column cell.
.. attribute:: empty_value
A string or callable to be used for cells which have no data.
Defaults to the string ``"-"``.
.. attribute:: summation
A string containing the name of a summation method to be used in
the generation of a summary row for this column. By default the
options are ``"sum"`` or ``"average"``, which behave as expected.
Optional.
.. attribute:: filters
A list of functions (often template filters) to be applied to the
value of the data for this column prior to output. This is effectively
a shortcut for writing a custom ``transform`` function in simple cases.
.. attribute:: classes
An iterable of CSS classes which should be added to this column.
Example: ``classes=('foo', 'bar')``.
.. attribute:: attrs
A dict of HTML attribute strings which should be added to this column.
Example: ``attrs={"data-foo": "bar"}``.
.. attribute:: truncate
An integer for the maximum length of the string in this column. If the
data in this column is larger than the supplied number, the data for
this column will be truncated and an ellipsis will be appended to the
truncated data.
Defaults to ``None``.
.. attribute:: link_classes
An iterable of CSS classes which will be added when the column's text
is displayed as a link.
Example: ``classes=('link-foo', 'link-bar')``.
Defaults to ``None``.
"""
summation_methods = {
"sum": sum,
"average": lambda data: sum(data, 0.0) / len(data)
}
# Used to retain order when instantiating columns on a table
creation_counter = 0
transform = None
name = None
verbose_name = None
status_choices = (
('enabled', True),
('true', True),
('up', True),
('active', True),
('on', True),
('none', None),
('unknown', None),
('', None),
('disabled', False),
('down', False),
('false', False),
('inactive', False),
('off', False),
)
def __init__(self, transform, verbose_name=None, sortable=True,
link=None, allowed_data_types=[], hidden=False, attrs=None,
status=False, status_choices=None, display_choices=None,
empty_value=None, filters=None, classes=None, summation=None,
auto=None, truncate=None, link_classes=None):
self.classes = list(classes or getattr(self, "classes", []))
super(Column, self).__init__()
self.attrs.update(attrs or {})
if callable(transform):
self.transform = transform
self.name = transform.__name__
else:
self.transform = unicode(transform)
self.name = self.transform
# Empty string is a valid value for verbose_name
if verbose_name is None:
verbose_name = self.transform.title()
else:
verbose_name = verbose_name
self.auto = auto
self.sortable = sortable
self.verbose_name = verbose_name
self.link = link
self.allowed_data_types = allowed_data_types
self.hidden = hidden
self.status = status
self.empty_value = empty_value or '-'
self.filters = filters or []
self.truncate = truncate
self.link_classes = link_classes or []
if status_choices:
self.status_choices = status_choices
self.display_choices = display_choices
if summation is not None and summation not in self.summation_methods:
raise ValueError("Summation method %s must be one of %s."
% (summation,
", ".join(self.summation_methods.keys())))
self.summation = summation
self.creation_counter = Column.creation_counter
Column.creation_counter += 1
if self.sortable and not self.auto:
self.classes.append("sortable")
if self.hidden:
self.classes.append("hide")
if self.link is not None:
self.classes.append('anchor')
def __unicode__(self):
return unicode(self.verbose_name)
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self.name)
[docs] def get_raw_data(self, datum):
"""
Returns the raw data for this column, before any filters or formatting
are applied to it. This is useful when doing calculations on data in
the table.
"""
# Callable transformations
if callable(self.transform):
data = self.transform(datum)
# Basic object lookups
elif hasattr(datum, self.transform):
data = getattr(datum, self.transform, None)
# Dict lookups
elif isinstance(datum, collections.Iterable) and \
self.transform in datum:
data = datum.get(self.transform)
else:
if settings.DEBUG:
msg = _("The attribute %(attr)s doesn't exist on "
"%(obj)s.") % {'attr': self.transform, 'obj': datum}
msg = termcolors.colorize(msg, **PALETTE['ERROR'])
LOG.warning(msg)
data = None
return data
[docs] def get_data(self, datum):
"""
Returns the final display data for this column from the given inputs.
The return value will be either the attribute specified for this column
or the return value of the attr:`~horizon.tables.Column.transform`
method for this column.
"""
datum_id = self.table.get_object_id(datum)
if datum_id in self.table._data_cache[self]:
return self.table._data_cache[self][datum_id]
data = self.get_raw_data(datum)
display_value = None
if self.display_choices:
display_value = [display for (value, display) in
self.display_choices
if value.lower() == (data or '').lower()]
if display_value:
data = display_value[0]
else:
for filter_func in self.filters:
data = filter_func(data)
if data and self.truncate:
data = truncatechars(data, self.truncate)
self.table._data_cache[self][datum_id] = data
return self.table._data_cache[self][datum_id]
[docs] def get_link_url(self, datum):
""" Returns the final value for the column's ``link`` property.
If ``allowed_data_types`` of this column is not empty and the datum
has an assigned type, check if the datum's type is in the
``allowed_data_types`` list. If not, the datum won't be displayed
as a link.
If ``link`` is a callable, it will be passed the current data object
and should return a URL. Otherwise ``get_link_url`` will attempt to
call ``reverse`` on ``link`` with the object's id as a parameter.
Failing that, it will simply return the value of ``link``.
"""
if self.allowed_data_types:
data_type_name = self.table._meta.data_type_name
data_type = getattr(datum, data_type_name, None)
if data_type and (data_type not in self.allowed_data_types):
return None
obj_id = self.table.get_object_id(datum)
if callable(self.link):
return self.link(datum)
try:
return urlresolvers.reverse(self.link, args=(obj_id,))
except urlresolvers.NoReverseMatch:
return self.link
[docs] def get_summation(self):
"""
Returns the summary value for the data in this column if a
valid summation method is specified for it. Otherwise returns ``None``.
"""
if self.summation not in self.summation_methods:
return None
summation_function = self.summation_methods[self.summation]
data = [self.get_raw_data(datum) for datum in self.table.data]
data = filter(lambda datum: datum is not None, data)
if len(data):
summation = summation_function(data)
for filter_func in self.filters:
summation = filter_func(summation)
return summation
else:
return None
[docs]class Row(html.HTMLElement):
""" Represents a row in the table.
When iterated, the ``Row`` instance will yield each of its cells.
Rows are capable of AJAX updating, with a little added work:
The ``ajax`` property needs to be set to ``True``, and
subclasses need to define a ``get_data`` method which returns a data
object appropriate for consumption by the table (effectively the "get"
lookup versus the table's "list" lookup).
The automatic update interval is configurable by setting the key
``ajax_poll_interval`` in the ``HORIZON_CONFIG`` dictionary.
Default: ``2500`` (measured in milliseconds).
.. attribute:: table
The table which this row belongs to.
.. attribute:: datum
The data object which this row represents.
.. attribute:: id
A string uniquely representing this row composed of the table name
and the row data object's identifier.
.. attribute:: cells
The cells belonging to this row stored in a ``SortedDict`` object.
This attribute is populated during instantiation.
.. attribute:: status
Boolean value representing the status of this row calculated from
the values of the table's ``status_columns`` if they are set.
.. attribute:: status_class
Returns a css class for the status of the row based on ``status``.
.. attribute:: ajax
Boolean value to determine whether ajax updating for this row is
enabled.
.. attribute:: ajax_action_name
String that is used for the query parameter key to request AJAX
updates. Generally you won't need to change this value.
Default: ``"row_update"``.
"""
ajax = False
ajax_action_name = "row_update"
def __init__(self, table, datum=None):
super(Row, self).__init__()
self.table = table
self.datum = datum
self.selected = False
if self.datum:
self.load_cells()
else:
self.id = None
self.cells = []
[docs] def load_cells(self, datum=None):
"""
Load the row's data (either provided at initialization or as an
argument to this function), initiailize all the cells contained
by this row, and set the appropriate row properties which require
the row's data to be determined.
This function is called automatically by
:meth:`~horizon.tables.Row.__init__` if the ``datum`` argument is
provided. However, by not providing the data during initialization
this function allows for the possibility of a two-step loading
pattern when you need a row instance but don't yet have the data
available.
"""
# Compile all the cells on instantiation.
table = self.table
if datum:
self.datum = datum
else:
datum = self.datum
cells = []
for column in table.columns.values():
if column.auto == "multi_select":
widget = forms.CheckboxInput(check_test=False)
# Convert value to string to avoid accidental type conversion
data = widget.render('object_ids',
unicode(table.get_object_id(datum)))
table._data_cache[column][table.get_object_id(datum)] = data
elif column.auto == "actions":
data = table.render_row_actions(datum)
table._data_cache[column][table.get_object_id(datum)] = data
else:
data = column.get_data(datum)
cell = Cell(datum, data, column, self)
cells.append((column.name or column.auto, cell))
self.cells = SortedDict(cells)
if self.ajax:
interval = conf.HORIZON_CONFIG['ajax_poll_interval']
self.attrs['data-update-interval'] = interval
self.attrs['data-update-url'] = self.get_ajax_update_url()
self.classes.append("ajax-update")
# Add the row's status class and id to the attributes to be rendered.
self.classes.append(self.status_class)
id_vals = {"table": self.table.name,
"sep": STRING_SEPARATOR,
"id": table.get_object_id(datum)}
self.id = "%(table)s%(sep)srow%(sep)s%(id)s" % id_vals
self.attrs['id'] = self.id
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self.id)
def __iter__(self):
return iter(self.cells.values())
@property
[docs] def status(self):
column_names = self.table._meta.status_columns
if column_names:
statuses = dict([(column_name, self.cells[column_name].status) for
column_name in column_names])
return self.table.calculate_row_status(statuses)
@property
[docs] def status_class(self):
column_names = self.table._meta.status_columns
if column_names:
return self.table.get_row_status_class(self.status)
else:
return ''
[docs] def render(self):
return render_to_string("horizon/common/_data_table_row.html",
{"row": self})
[docs] def get_cells(self):
""" Returns the bound cells for this row in order. """
return self.cells.values()
[docs] def get_ajax_update_url(self):
table_url = self.table.get_absolute_url()
params = urlencode({"table": self.table.name,
"action": self.ajax_action_name,
"obj_id": self.table.get_object_id(self.datum)})
return "%s?%s" % (table_url, params)
[docs] def get_data(self, request, obj_id):
"""
Fetches the updated data for the row based on the object id
passed in. Must be implemented by a subclass to allow AJAX updating.
"""
raise NotImplementedError("You must define a get_data method on %s"
% self.__class__.__name__)
[docs]class Cell(html.HTMLElement):
""" Represents a single cell in the table. """
def __init__(self, datum, data, column, row, attrs=None, classes=None):
self.classes = classes or getattr(self, "classes", [])
super(Cell, self).__init__()
self.attrs.update(attrs or {})
self.datum = datum
self.data = data
self.column = column
self.row = row
def __repr__(self):
return '<%s: %s, %s>' % (self.__class__.__name__,
self.column.name,
self.row.id)
@property
[docs] def value(self):
"""
Returns a formatted version of the data for final output.
This takes into consideration the
:attr:`~horizon.tables.Column.link`` and
:attr:`~horizon.tables.Column.empty_value`
attributes.
"""
try:
data = self.column.get_data(self.datum)
if data is None:
if callable(self.column.empty_value):
data = self.column.empty_value(self.datum)
else:
data = self.column.empty_value
except:
data = None
exc_info = sys.exc_info()
raise template.TemplateSyntaxError, exc_info[1], exc_info[2]
if self.url:
link_classes = ' '.join(self.column.link_classes)
# Escape the data inside while allowing our HTML to render
data = mark_safe('<a href="%s" class="%s">%s</a>' %
(self.url, link_classes, escape(data)))
return data
@property
[docs] def url(self):
if self.column.link:
url = self.column.get_link_url(self.datum)
if url:
return url
else:
return None
@property
[docs] def status(self):
""" Gets the status for the column based on the cell's data. """
# Deal with status column mechanics based in this cell's data
if hasattr(self, '_status'):
return self._status
if self.column.status or \
self.column.name in self.column.table._meta.status_columns:
#returns the first matching status found
data_value_lower = unicode(self.data).lower()
for status_name, status_value in self.column.status_choices:
if unicode(status_name).lower() == data_value_lower:
self._status = status_value
return self._status
self._status = None
return self._status
[docs] def get_status_class(self, status):
""" Returns a css class name determined by the status value. """
if status is True:
return "status_up"
elif status is False:
return "status_down"
else:
return "status_unknown"
[docs] def get_default_classes(self):
""" Returns a flattened string of the cell's CSS classes. """
if not self.url:
self.column.classes = [cls for cls in self.column.classes
if cls != "anchor"]
column_class_string = self.column.get_final_attrs().get('class', "")
classes = set(column_class_string.split(" "))
if self.column.status:
classes.add(self.get_status_class(self.status))
return list(classes)
[docs]class DataTableOptions(object):
""" Contains options for :class:`.DataTable` objects.
.. attribute:: name
A short name or slug for the table.
.. attribute:: verbose_name
A more verbose name for the table meant for display purposes.
.. attribute:: columns
A list of column objects or column names. Controls ordering/display
of the columns in the table.
.. attribute:: table_actions
A list of action classes derived from the
:class:`~horizon.tables.Action` class. These actions will handle tasks
such as bulk deletion, etc. for multiple objects at once.
.. attribute:: row_actions
A list similar to ``table_actions`` except tailored to appear for
each row. These actions act on a single object at a time.
.. attribute:: actions_column
Boolean value to control rendering of an additional column containing
the various actions for each row. Defaults to ``True`` if any actions
are specified in the ``row_actions`` option.
.. attribute:: multi_select
Boolean value to control rendering of an extra column with checkboxes
for selecting multiple objects in the table. Defaults to ``True`` if
any actions are specified in the ``table_actions`` option.
.. attribute:: filter
Boolean value to control the display of the "filter" search box
in the table actions. By default it checks whether or not an instance
of :class:`.FilterAction` is in :attr:`.table_actions`.
.. attribute:: template
String containing the template which should be used to render the
table. Defaults to ``"horizon/common/_data_table.html"``.
.. attribute:: context_var_name
The name of the context variable which will contain the table when
it is rendered. Defaults to ``"table"``.
.. attribute:: pagination_param
The name of the query string parameter which will be used when
paginating this table. When using multiple tables in a single
view this will need to be changed to differentiate between the
tables. Default: ``"marker"``.
.. attribute:: status_columns
A list or tuple of column names which represents the "state"
of the data object being represented.
If ``status_columns`` is set, when the rows are rendered the value
of this column will be used to add an extra class to the row in
the form of ``"status_up"`` or ``"status_down"`` for that row's
data.
The row status is used by other Horizon components to trigger tasks
such as dynamic AJAX updating.
.. attribute:: row_class
The class which should be used for rendering the rows of this table.
Optional. Default: :class:`~horizon.tables.Row`.
.. attribute:: column_class
The class which should be used for handling the columns of this table.
Optional. Default: :class:`~horizon.tables.Column`.
.. attribute:: mixed_data_type
A toggle to indicate if the table accepts two or more types of data.
Optional. Default: :``False``
.. attribute:: data_types
A list of data types that this table would accept. Default to be an
empty list, but if the attibute ``mixed_data_type`` is set to ``True``,
then this list must have at least one element.
.. attribute:: data_type_name
The name of an attribute to assign to data passed to the table when it
accepts mix data. Default: ``"_table_data_type"``
.. attribute:: footer
Boolean to control whether or not to show the table's footer.
Default: ``True``.
.. attribute:: permissions
A list of permission names which this table requires in order to be
displayed. Defaults to an empty list (``[]``).
"""
def __init__(self, options):
self.name = getattr(options, 'name', self.__class__.__name__)
verbose_name = getattr(options, 'verbose_name', None) \
or self.name.title()
self.verbose_name = verbose_name
self.columns = getattr(options, 'columns', None)
self.status_columns = getattr(options, 'status_columns', [])
self.table_actions = getattr(options, 'table_actions', [])
self.row_actions = getattr(options, 'row_actions', [])
self.row_class = getattr(options, 'row_class', Row)
self.column_class = getattr(options, 'column_class', Column)
self.pagination_param = getattr(options, 'pagination_param', 'marker')
self.browser_table = getattr(options, 'browser_table', None)
self.footer = getattr(options, 'footer', True)
self.no_data_message = getattr(options,
"no_data_message",
_("No items to display."))
self.permissions = getattr(options, 'permissions', [])
# Set self.filter if we have any FilterActions
filter_actions = [action for action in self.table_actions if
issubclass(action, FilterAction)]
if len(filter_actions) > 1:
raise NotImplementedError("Multiple filter actions is not "
"currently supported.")
self.filter = getattr(options, 'filter', len(filter_actions) > 0)
if len(filter_actions) == 1:
self._filter_action = filter_actions.pop()
else:
self._filter_action = None
self.template = 'horizon/common/_data_table.html'
self.row_actions_template = \
'horizon/common/_data_table_row_actions.html'
self.table_actions_template = \
'horizon/common/_data_table_table_actions.html'
self.context_var_name = unicode(getattr(options,
'context_var_name',
'table'))
self.actions_column = getattr(options,
'actions_column',
len(self.row_actions) > 0)
self.multi_select = getattr(options,
'multi_select',
len(self.table_actions) > 0)
# Set runtime table defaults; not configurable.
self.has_more_data = False
# Set mixed data type table attr
self.mixed_data_type = getattr(options, 'mixed_data_type', False)
self.data_types = getattr(options, 'data_types', [])
# If the data_types has more than 2 elements, set mixed_data_type
# to True automatically.
if len(self.data_types) > 1:
self.mixed_data_type = True
# However, if the mixed_data_type is set to True manually and the
# the data_types is empty, raise an errror.
if self.mixed_data_type and len(self.data_types) <= 1:
raise ValueError("If mixed_data_type is set to True in class %s, "
"data_types should has more than one types" %
self.name)
self.data_type_name = getattr(options,
'data_type_name',
"_table_data_type")
[docs]class DataTable(object):
""" A class which defines a table with all data and associated actions.
.. attribute:: name
String. Read-only access to the name specified in the
table's Meta options.
.. attribute:: multi_select
Boolean. Read-only access to whether or not this table
should display a column for multi-select checkboxes.
.. attribute:: data
Read-only access to the data this table represents.
.. attribute:: filtered_data
Read-only access to the data this table represents, filtered by
the :meth:`~horizon.tables.FilterAction.filter` method of the table's
:class:`~horizon.tables.FilterAction` class (if one is provided)
using the current request's query parameters.
"""
__metaclass__ = DataTableMetaclass
def __init__(self, request, data=None, needs_form_wrapper=None, **kwargs):
self.request = request
self.data = data
self.kwargs = kwargs
self._needs_form_wrapper = needs_form_wrapper
self._no_data_message = self._meta.no_data_message
self.breadcrumb = None
self.current_item_id = None
self.permissions = self._meta.permissions
# Create a new set
columns = []
for key, _column in self._columns.items():
column = copy.copy(_column)
column.table = self
columns.append((key, column))
self.columns = SortedDict(columns)
self._populate_data_cache()
# Associate these actions with this table
for action in self.base_actions.values():
action.table = self
self.needs_summary_row = any([col.summation
for col in self.columns.values()])
def __unicode__(self):
return unicode(self._meta.verbose_name)
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self._meta.name)
@property
[docs] def name(self):
return self._meta.name
@property
@property
[docs] def multi_select(self):
return self._meta.multi_select
@property
[docs] def filtered_data(self):
if not hasattr(self, '_filtered_data'):
self._filtered_data = self.data
if self._meta.filter and self._meta._filter_action:
action = self._meta._filter_action
filter_string = self.get_filter_string()
request_method = self.request.method
needs_preloading = (not filter_string
and request_method == 'GET'
and action.needs_preloading)
valid_method = (request_method == action.method)
if (filter_string and valid_method) or needs_preloading:
if self._meta.mixed_data_type:
self._filtered_data = action.data_type_filter(self,
self.data,
filter_string)
else:
self._filtered_data = action.filter(self,
self.data,
filter_string)
return self._filtered_data
[docs] def get_filter_string(self):
filter_action = self._meta._filter_action
param_name = filter_action.get_param_name()
filter_string = self.request.POST.get(param_name, '')
return filter_string
def _populate_data_cache(self):
self._data_cache = {}
# Set up hash tables to store data points for each column
for column in self.get_columns():
self._data_cache[column] = {}
def _filter_action(self, action, request, datum=None):
try:
# Catch user errors in permission functions here
row_matched = True
if self._meta.mixed_data_type:
row_matched = action.data_type_matched(datum)
return action._allowed(request, datum) and row_matched
except Exception:
LOG.exception("Error while checking action permissions.")
return None
[docs] def is_browser_table(self):
if self._meta.browser_table:
return True
return False
[docs] def render(self):
""" Renders the table using the template from the table options. """
table_template = template.loader.get_template(self._meta.template)
extra_context = {self._meta.context_var_name: self}
context = template.RequestContext(self.request, extra_context)
return table_template.render(context)
[docs] def get_absolute_url(self):
""" Returns the canonical URL for this table.
This is used for the POST action attribute on the form element
wrapping the table. In many cases it is also useful for redirecting
after a successful action on the table.
For convenience it defaults to the value of
``request.get_full_path()`` with any query string stripped off,
e.g. the path at which the table was requested.
"""
return self.request.get_full_path().partition('?')[0]
[docs] def get_empty_message(self):
""" Returns the message to be displayed when there is no data. """
return self._no_data_message
[docs] def get_object_by_id(self, lookup):
"""
Returns the data object from the table's dataset which matches
the ``lookup`` parameter specified. An error will be raised if
the match is not a single data object.
Uses :meth:`~horizon.tables.DataTable.get_object_id` internally.
"""
matches = [datum for datum in self.data if
self.get_object_id(datum) == lookup]
if len(matches) > 1:
raise ValueError("Multiple matches were returned for that id: %s."
% matches)
if not matches:
raise exceptions.Http302(self.get_absolute_url(),
_('No match returned for the id "%s".')
% lookup)
return matches[0]
@property
[docs] def has_actions(self):
"""
Boolean. Indicates whether there are any available actions on this
table.
"""
if not self.base_actions:
return False
return any(self.get_table_actions()) or any(self._meta.row_actions)
@property
[docs] def get_table_actions(self):
""" Returns a list of the action instances for this table. """
bound_actions = [self.base_actions[action.name] for
action in self._meta.table_actions]
return [action for action in bound_actions if
self._filter_action(action, self.request)]
[docs] def get_row_actions(self, datum):
""" Returns a list of the action instances for a specific row. """
bound_actions = []
for action in self._meta.row_actions:
# Copy to allow modifying properties per row
bound_action = copy.copy(self.base_actions[action.name])
bound_action.attrs = copy.copy(bound_action.attrs)
bound_action.datum = datum
# Remove disallowed actions.
if not self._filter_action(bound_action,
self.request,
datum):
continue
# Hook for modifying actions based on data. No-op by default.
bound_action.update(self.request, datum)
# Pre-create the URL for this link with appropriate parameters
if issubclass(bound_action.__class__, LinkAction):
bound_action.bound_url = bound_action.get_link_url(datum)
bound_actions.append(bound_action)
return bound_actions
[docs] def render_table_actions(self):
""" Renders the actions specified in ``Meta.table_actions``. """
template_path = self._meta.table_actions_template
table_actions_template = template.loader.get_template(template_path)
bound_actions = self.get_table_actions()
extra_context = {"table_actions": bound_actions}
if self._meta.filter and \
self._filter_action(self._meta._filter_action, self.request):
extra_context["filter"] = self._meta._filter_action
context = template.RequestContext(self.request, extra_context)
return table_actions_template.render(context)
[docs] def render_row_actions(self, datum):
"""
Renders the actions specified in ``Meta.row_actions`` using the
current row data. """
template_path = self._meta.row_actions_template
row_actions_template = template.loader.get_template(template_path)
bound_actions = self.get_row_actions(datum)
extra_context = {"row_actions": bound_actions,
"row_id": self.get_object_id(datum)}
context = template.RequestContext(self.request, extra_context)
return row_actions_template.render(context)
@staticmethod
[docs] def parse_action(action_string):
"""
Parses the ``action`` parameter (a string) sent back with the
POST data. By default this parses a string formatted as
``{{ table_name }}__{{ action_name }}__{{ row_id }}`` and returns
each of the pieces. The ``row_id`` is optional.
"""
if action_string:
bits = action_string.split(STRING_SEPARATOR)
bits.reverse()
table = bits.pop()
action = bits.pop()
try:
object_id = bits.pop()
except IndexError:
object_id = None
return table, action, object_id
[docs] def take_action(self, action_name, obj_id=None, obj_ids=None):
"""
Locates the appropriate action and routes the object
data to it. The action should return an HTTP redirect
if successful, or a value which evaluates to ``False``
if unsuccessful.
"""
# See if we have a list of ids
obj_ids = obj_ids or self.request.POST.getlist('object_ids')
action = self.base_actions.get(action_name, None)
if not action or action.method != self.request.method:
# We either didn't get an action or we're being hacked. Goodbye.
return None
# Meanhile, back in Gotham...
if not action.requires_input or obj_id or obj_ids:
if obj_id:
obj_id = self.sanitize_id(obj_id)
if obj_ids:
obj_ids = [self.sanitize_id(i) for i in obj_ids]
# Single handling is easy
if not action.handles_multiple:
response = action.single(self, self.request, obj_id)
# Otherwise figure out what to pass along
else:
# Preference given to a specific id, since that implies
# the user selected an action for just one row.
if obj_id:
obj_ids = [obj_id]
response = action.multiple(self, self.request, obj_ids)
return response
elif action and action.requires_input and not (obj_id or obj_ids):
messages.info(self.request,
_("Please select a row before taking that action."))
return None
@classmethod
[docs] def check_handler(cls, request):
""" Determine whether the request should be handled by this table. """
if request.method == "POST" and "action" in request.POST:
table, action, obj_id = cls.parse_action(request.POST["action"])
elif "table" in request.GET and "action" in request.GET:
table = request.GET["table"]
action = request.GET["action"]
obj_id = request.GET.get("obj_id", None)
else:
table = action = obj_id = None
return table, action, obj_id
[docs] def maybe_preempt(self):
"""
Determine whether the request should be handled by a preemptive action
on this table or by an AJAX row update before loading any data.
"""
request = self.request
table_name, action_name, obj_id = self.check_handler(request)
if table_name == self.name:
# Handle AJAX row updating.
new_row = self._meta.row_class(self)
if new_row.ajax and new_row.ajax_action_name == action_name:
try:
datum = new_row.get_data(request, obj_id)
new_row.load_cells(datum)
error = False
except:
datum = None
error = exceptions.handle(request, ignore=True)
if request.is_ajax():
if not error:
return HttpResponse(new_row.render())
else:
return HttpResponse(status=error.status_code)
preemptive_actions = [action for action in
self.base_actions.values() if action.preempt]
if action_name:
for action in preemptive_actions:
if action.name == action_name:
handled = self.take_action(action_name, obj_id)
if handled:
return handled
return None
[docs] def maybe_handle(self):
"""
Determine whether the request should be handled by any action on this
table after data has been loaded.
"""
request = self.request
table_name, action_name, obj_id = self.check_handler(request)
if table_name == self.name and action_name:
return self.take_action(action_name, obj_id)
return None
[docs] def sanitize_id(self, obj_id):
""" Override to modify an incoming obj_id to match existing
API data types or modify the format.
"""
return obj_id
[docs] def get_object_id(self, datum):
""" Returns the identifier for the object this row will represent.
By default this returns an ``id`` attribute on the given object,
but this can be overridden to return other values.
.. warning::
Make sure that the value returned is a unique value for the id
otherwise rendering issues can occur.
"""
return datum.id
[docs] def get_object_display(self, datum):
""" Returns a display name that identifies this object.
By default, this returns a ``name`` attribute from the given object,
but this can be overriden to return other values.
"""
return datum.name
[docs] def has_more_data(self):
"""
Returns a boolean value indicating whether there is more data
available to this table from the source (generally an API).
The method is largely meant for internal use, but if you want to
override it to provide custom behavior you can do so at your own risk.
"""
return self._meta.has_more_data
[docs] def get_marker(self):
"""
Returns the identifier for the last object in the current data set
for APIs that use marker/limit-based paging.
"""
return http.urlquote_plus(self.get_object_id(self.data[-1]))
[docs] def calculate_row_status(self, statuses):
"""
Returns a boolean value determining the overall row status
based on the dictionary of column name to status mappings passed in.
By default, it uses the following logic:
#. If any statuses are ``False``, return ``False``.
#. If no statuses are ``False`` but any or ``None``, return ``None``.
#. If all statuses are ``True``, return ``True``.
This provides the greatest protection against false positives without
weighting any particular columns.
The ``statuses`` parameter is passed in as a dictionary mapping
column names to their statuses in order to allow this function to
be overridden in such a way as to weight one column's status over
another should that behavior be desired.
"""
values = statuses.values()
if any([status is False for status in values]):
return False
elif any([status is None for status in values]):
return None
else:
return True
[docs] def get_row_status_class(self, status):
"""
Returns a css class name determined by the status value. This class
name is used to indicate the status of the rows in the table if
any ``status_columns`` have been specified.
"""
if status is True:
return "status_up"
elif status is False:
return "status_down"
else:
return "status_unknown"
[docs] def get_columns(self):
""" Returns this table's columns including auto-generated ones."""
return self.columns.values()
[docs] def get_rows(self):
""" Return the row data for this table broken out by columns. """
rows = []
try:
for datum in self.filtered_data:
row = self._meta.row_class(self, datum)
if self.get_object_id(datum) == self.current_item_id:
self.selected = True
row.classes.append('current_selected')
rows.append(row)
except:
# Exceptions can be swallowed at the template level here,
# re-raising as a TemplateSyntaxError makes them visible.
LOG.exception("Error while rendering table rows.")
exc_info = sys.exc_info()
raise template.TemplateSyntaxError, exc_info[1], exc_info[2]
return rows