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OpenStack Study: base.py**** CubicPower OpenStack Study ****
# 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 json import logging from operator import attrgetter import sys from django.core import exceptions as core_exceptions from django.core import urlresolvers from django import forms from django.http import HttpResponse # noqa from django import template from django.template.defaultfilters import truncatechars # noqa from django.template.loader import render_to_string from django.utils.datastructures import SortedDict from django.utils.html import escape from django.utils import http from django.utils.http import urlencode from django.utils.safestring import mark_safe from django.utils import termcolors from django.utils.translation import ugettext_lazy as _ from horizon import conf from horizon import exceptions from horizon import messages from horizon.tables.actions import FilterAction # noqa from horizon.tables.actions import LinkAction # noqa from horizon.utils import html LOG = logging.getLogger(__name__) PALETTE = termcolors.PALETTES[termcolors.DEFAULT_PALETTE] STRING_SEPARATOR = "__"
**** CubicPower OpenStack Study **** 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 if the ``transform`` is not callable, otherwise it
**** CubicPower OpenStack Study **** 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, wrap_list=False, form_field=None, form_field_attributes=None, update_action=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 = "<%s callable>" % 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: if callable(transform): self.verbose_name = '' else: self.verbose_name = self.transform.title() else: self.verbose_name = verbose_name self.auto = auto self.sortable = sortable 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 [] self.wrap_list = wrap_list self.form_field = form_field self.form_field_attributes = form_field_attributes or {} self.update_action = update_action 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')
**** CubicPower OpenStack Study **** def __unicode__(self): return unicode(self.verbose_name)
**** CubicPower OpenStack Study **** def __repr__(self): return '<%s: %s>' % (self.__class__.__name__, self.name)
**** CubicPower OpenStack Study **** 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) # Dict lookups elif isinstance(datum, collections.Mapping) and \ self.transform in datum: data = datum.get(self.transform) else: # Basic object lookups try: data = getattr(datum, self.transform) except AttributeError: 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
**** CubicPower OpenStack Study **** 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: try: data = filter_func(data) except Exception: msg = ("Filter '%(filter)s' failed with data " "'%(data)s' on column '%(col_name)s'") LOG.warning(msg, {'filter': filter_func.func_name, 'data': data, 'col_name': unicode(self.verbose_name)}) 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]
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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 = []
**** CubicPower OpenStack Study **** 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(): cell = table._meta.cell_class(datum, 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") self.attrs['data-object-id'] = table.get_object_id(datum) # 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 # Add the row's display name if available display_name = table.get_object_display(datum) if display_name: self.attrs['data-display'] = escape(display_name)
**** CubicPower OpenStack Study **** def __repr__(self): return '<%s: %s>' % (self.__class__.__name__, self.id)
**** CubicPower OpenStack Study **** def __iter__(self): return iter(self.cells.values()) @property
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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 ''
**** CubicPower OpenStack Study **** def render(self): return render_to_string("horizon/common/_data_table_row.html", {"row": self})
**** CubicPower OpenStack Study **** def get_cells(self): """Returns the bound cells for this row in order.""" return self.cells.values()
**** CubicPower OpenStack Study **** 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)
**** CubicPower OpenStack Study **** def can_be_selected(self, datum): """By default if multiselect enabled return True. You can remove the checkbox after an ajax update here if required. """ return True
**** CubicPower OpenStack Study **** 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__)
**** CubicPower OpenStack Study **** class Cell(html.HTMLElement): """Represents a single cell in the table."""
**** CubicPower OpenStack Study **** def __init__(self, datum, 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.column = column self.row = row self.wrap_list = column.wrap_list self.inline_edit_available = self.column.update_action is not None # initialize the update action if available if self.inline_edit_available: self.update_action = self.column.update_action() self.attrs['data-cell-name'] = column.name self.attrs['data-update-url'] = self.get_ajax_update_url() self.inline_edit_mod = False self.data = self.get_data(datum, column, row)
**** CubicPower OpenStack Study **** def get_data(self, datum, column, row): """Fetches the data to be displayed in this cell.""" table = row.table if column.auto == "multi_select": data = "" if row.can_be_selected(datum): widget = forms.CheckboxInput(check_test=lambda value: False) # Convert value to string to avoid accidental type conversion data = widget.render('object_ids', unicode(table.get_object_id(datum)), {'class': 'table-row-multi-select'}) table._data_cache[column][table.get_object_id(datum)] = data elif column.auto == "form_field": widget = column.form_field if issubclass(widget.__class__, forms.Field): widget = widget.widget widget_name = "%s__%s" % \ (column.name, unicode(table.get_object_id(datum))) # Create local copy of attributes, so it don't change column # class form_field_attributes form_field_attributes = {} form_field_attributes.update(column.form_field_attributes) # Adding id of the input so it pairs with label correctly form_field_attributes['id'] = widget_name data = widget.render(widget_name, column.get_data(datum), form_field_attributes) 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) return data
**** CubicPower OpenStack Study **** def __repr__(self): return '<%s: %s, %s>' % (self.__class__.__name__, self.column.name, self.row.id) @property
**** CubicPower OpenStack Study **** def id(self): return ("%s__%s" % (self.column.name, unicode(self.row.table.get_object_id(self.datum)))) @property
**** CubicPower OpenStack Study **** 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 Exception: 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(' (self.url, link_classes, escape(unicode(data)))) return data @property
**** CubicPower OpenStack Study **** def url(self): if self.column.link: url = self.column.get_link_url(self.datum) if url: return url else: return None @property
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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"
**** CubicPower OpenStack Study **** 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)) if self.inline_edit_available: classes.add("inline_edit_available") return list(classes)
**** CubicPower OpenStack Study **** def get_ajax_update_url(self): column = self.column table_url = column.table.get_absolute_url() params = urlencode({"table": column.table.name, "action": self.row.ajax_cell_action_name, "obj_id": column.table.get_object_id(self.datum), "cell_name": column.name}) return "%s?%s" % (table_url, params) @property
**** CubicPower OpenStack Study **** def update_allowed(self): """Determines whether update of given cell is allowed. Calls allowed action of defined UpdateAction of the Column. """ return self.update_action.allowed(self.column.table.request, self.datum, self)
**** CubicPower OpenStack Study **** def render(self): return render_to_string("horizon/common/_data_table_cell.html", {"cell": self})
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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.cell_class = getattr(options, 'cell_class', Cell) 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 = getattr(options, '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 error. 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")
**** CubicPower OpenStack Study **** class DataTableMetaclass(type): """Metaclass to add options to DataTable class and collect columns."""
**** CubicPower OpenStack Study **** def __new__(mcs, name, bases, attrs): # Process options from Meta class_name = name attrs["_meta"] = opts = DataTableOptions(attrs.get("Meta", None)) # Gather columns; this prevents the column from being an attribute # on the DataTable class and avoids naming conflicts. columns = [] for attr_name, obj in attrs.items(): if issubclass(type(obj), (opts.column_class, Column)): column_instance = attrs.pop(attr_name) column_instance.name = attr_name column_instance.classes.append('normal_column') columns.append((attr_name, column_instance)) columns.sort(key=lambda x: x[1].creation_counter) # Iterate in reverse to preserve final order for base in bases[::-1]: if hasattr(base, 'base_columns'): columns = base.base_columns.items() + columns attrs['base_columns'] = SortedDict(columns) # If the table is in a ResourceBrowser, the column number must meet # these limits because of the width of the browser. if opts.browser_table == "navigation" and len(columns) > 3: raise ValueError("You can only assign three column to %s." % class_name) if opts.browser_table == "content" and len(columns) > 2: raise ValueError("You can only assign two columns to %s." % class_name) if opts.columns: # Remove any columns that weren't declared if we're being explicit # NOTE: we're iterating a COPY of the list here! for column_data in columns[:]: if column_data[0] not in opts.columns: columns.pop(columns.index(column_data)) # Re-order based on declared columns columns.sort(key=lambda x: attrs['_meta'].columns.index(x[0])) # Add in our auto-generated columns if opts.multi_select and opts.browser_table != "navigation": multi_select = opts.column_class("multi_select", verbose_name="", auto="multi_select") multi_select.classes.append('multi_select_column') columns.insert(0, ("multi_select", multi_select)) if opts.actions_column: actions_column = opts.column_class("actions", verbose_name=_("Actions"), auto="actions") actions_column.classes.append('actions_column') columns.append(("actions", actions_column)) # Store this set of columns internally so we can copy them per-instance attrs['_columns'] = SortedDict(columns) # Gather and register actions for later access since we only want # to instantiate them once. # (list() call gives deterministic sort order, which sets don't have.) actions = list(set(opts.row_actions) | set(opts.table_actions)) actions.sort(key=attrgetter('name')) actions_dict = SortedDict([(action.name, action()) for action in actions]) attrs['base_actions'] = actions_dict if opts._filter_action: # Replace our filter action with the instantiated version opts._filter_action = actions_dict[opts._filter_action.name] # Create our new class! return type.__new__(mcs, name, bases, attrs)
**** CubicPower OpenStack Study **** class DataTable(object): """A class which
**** CubicPower OpenStack Study **** 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()])
**** CubicPower OpenStack Study **** def __unicode__(self): return unicode(self._meta.verbose_name)
**** CubicPower OpenStack Study **** def __repr__(self): return '<%s: %s>' % (self.__class__.__name__, self._meta.name) @property
**** CubicPower OpenStack Study **** def name(self): return self._meta.name @property
**** CubicPower OpenStack Study **** def footer(self): return self._meta.footer @property
**** CubicPower OpenStack Study **** def multi_select(self): return self._meta.multi_select @property
**** CubicPower OpenStack Study **** def filtered_data(self): # This function should be using django.utils.functional.cached_property # decorator, but unfortunately due to bug in Django # https://code.djangoproject.com/ticket/19872 it would make it fail # when being mocked by mox in tests. 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 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
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** 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] = {}
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** def is_browser_table(self): if self._meta.browser_table: return True return False
**** CubicPower OpenStack Study **** 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)
**** CubicPower OpenStack Study **** 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]
**** CubicPower OpenStack Study **** def get_full_url(self): """Returns the full URL path for this table. This is used for the POST action attribute on the form element wrapping the table. We use this method to persist the pagination marker. """ return self.request.get_full_path()
**** CubicPower OpenStack Study **** def get_empty_message(self): """Returns the message to be displayed when there is no data.""" return self._no_data_message
**** CubicPower OpenStack Study **** 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. We will convert the object id and ``lookup`` to unicode before comparison. Uses :meth:`~horizon.tables.DataTable.get_object_id` internally. """ if not isinstance(lookup, unicode): lookup = unicode(str(lookup), 'utf-8') matches = [] for datum in self.data: obj_id = self.get_object_id(datum) if not isinstance(obj_id, unicode): obj_id = unicode(str(obj_id), 'utf-8') if obj_id == lookup: matches.append(datum) 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
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** def needs_form_wrapper(self): """Boolean. Indicates whether this table should be rendered wrapped in a `` |