app/django/contrib/admin/views/main.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Tue, 14 Oct 2008 16:00:59 +0000
changeset 323 ff1a9aa48cfd
parent 54 03e267d67478
permissions -rw-r--r--
Load ../vendor/django into trunk/app/django.
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from django.contrib.admin.filterspecs import FilterSpec
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from django.contrib.admin.options import IncorrectLookupParameters
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from django.contrib.admin.util import quote
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from django.core.paginator import Paginator, InvalidPage
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from django.db import models
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from django.db.models.query import QuerySet
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from django.utils.encoding import force_unicode, smart_str
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from django.utils.translation import ugettext
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from django.utils.http import urlencode
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import operator
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try:
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    set
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except NameError:
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    from sets import Set as set   # Python 2.3 fallback
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# The system will display a "Show all" link on the change list only if the
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# total result count is less than or equal to this setting.
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MAX_SHOW_ALL_ALLOWED = 200
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# Changelist settings
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ALL_VAR = 'all'
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ORDER_VAR = 'o'
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ORDER_TYPE_VAR = 'ot'
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PAGE_VAR = 'p'
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SEARCH_VAR = 'q'
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TO_FIELD_VAR = 't'
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IS_POPUP_VAR = 'pop'
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ERROR_FLAG = 'e'
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# Text to display within change-list table cells if the value is blank.
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EMPTY_CHANGELIST_VALUE = '(None)'
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class ChangeList(object):
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    def __init__(self, request, model, list_display, list_display_links, list_filter, date_hierarchy, search_fields, list_select_related, list_per_page, model_admin):
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        self.model = model
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        self.opts = model._meta
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        self.lookup_opts = self.opts
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        self.root_query_set = model_admin.queryset(request)
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        self.list_display = list_display
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        self.list_display_links = list_display_links
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        self.list_filter = list_filter
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        self.date_hierarchy = date_hierarchy
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        self.search_fields = search_fields
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        self.list_select_related = list_select_related
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        self.list_per_page = list_per_page
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        self.model_admin = model_admin
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        # Get search parameters from the query string.
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        try:
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            self.page_num = int(request.GET.get(PAGE_VAR, 0))
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        except ValueError:
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            self.page_num = 0
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        self.show_all = ALL_VAR in request.GET
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        self.is_popup = IS_POPUP_VAR in request.GET
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        self.to_field = request.GET.get(TO_FIELD_VAR)
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        self.params = dict(request.GET.items())
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        if PAGE_VAR in self.params:
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            del self.params[PAGE_VAR]
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        if TO_FIELD_VAR in self.params:
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            del self.params[TO_FIELD_VAR]
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        if ERROR_FLAG in self.params:
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            del self.params[ERROR_FLAG]
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        self.order_field, self.order_type = self.get_ordering()
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        self.query = request.GET.get(SEARCH_VAR, '')
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        self.query_set = self.get_query_set()
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        self.get_results(request)
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        self.title = (self.is_popup and ugettext('Select %s') % force_unicode(self.opts.verbose_name) or ugettext('Select %s to change') % force_unicode(self.opts.verbose_name))
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        self.filter_specs, self.has_filters = self.get_filters(request)
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        self.pk_attname = self.lookup_opts.pk.attname
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    def get_filters(self, request):
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        filter_specs = []
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        if self.list_filter:
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            filter_fields = [self.lookup_opts.get_field(field_name) for field_name in self.list_filter]
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            for f in filter_fields:
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                spec = FilterSpec.create(f, request, self.params, self.model, self.model_admin)
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                if spec and spec.has_output():
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                    filter_specs.append(spec)
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        return filter_specs, bool(filter_specs)
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    def get_query_string(self, new_params=None, remove=None):
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        if new_params is None: new_params = {}
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        if remove is None: remove = []
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        p = self.params.copy()
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        for r in remove:
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            for k in p.keys():
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                if k.startswith(r):
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                    del p[k]
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        for k, v in new_params.items():
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            if v is None:
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                if k in p:
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                    del p[k]
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            else:
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                p[k] = v
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        return '?%s' % urlencode(p)
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    def get_results(self, request):
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        paginator = Paginator(self.query_set, self.list_per_page)
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        # Get the number of objects, with admin filters applied.
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        try:
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            result_count = paginator.count
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        # Naked except! Because we don't have any other way of validating
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        # "params". They might be invalid if the keyword arguments are
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        # incorrect, or if the values are not in the correct type (which would
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        # result in a database error).
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        except:
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            raise IncorrectLookupParameters
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        # Get the total number of objects, with no admin filters applied.
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        # Perform a slight optimization: Check to see whether any filters were
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        # given. If not, use paginator.hits to calculate the number of objects,
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        # because we've already done paginator.hits and the value is cached.
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        if not self.query_set.query.where:
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            full_result_count = result_count
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        else:
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            full_result_count = self.root_query_set.count()
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        can_show_all = result_count <= MAX_SHOW_ALL_ALLOWED
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        multi_page = result_count > self.list_per_page
54
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   122
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   123
        # Get the list of objects to display on this page.
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   124
        if (self.show_all and can_show_all) or not multi_page:
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   125
            result_list = list(self.query_set)
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   126
        else:
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   127
            try:
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                result_list = paginator.page(self.page_num+1).object_list
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   129
            except InvalidPage:
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   130
                result_list = ()
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   131
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        self.result_count = result_count
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   133
        self.full_result_count = full_result_count
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        self.result_list = result_list
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   135
        self.can_show_all = can_show_all
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   136
        self.multi_page = multi_page
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   137
        self.paginator = paginator
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   138
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   139
    def get_ordering(self):
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        lookup_opts, params = self.lookup_opts, self.params
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   141
        # For ordering, first check the "ordering" parameter in the admin
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   142
        # options, then check the object's default ordering. If neither of
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   143
        # those exist, order descending by ID by default. Finally, look for
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   144
        # manually-specified ordering from the query string.
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        ordering = self.model_admin.ordering or lookup_opts.ordering or ['-' + lookup_opts.pk.name]
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   146
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   147
        if ordering[0].startswith('-'):
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   148
            order_field, order_type = ordering[0][1:], 'desc'
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   149
        else:
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            order_field, order_type = ordering[0], 'asc'
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   151
        if ORDER_VAR in params:
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            try:
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                field_name = self.list_display[int(params[ORDER_VAR])]
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   154
                try:
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                    f = lookup_opts.get_field(field_name)
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   156
                except models.FieldDoesNotExist:
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   157
                    # See whether field_name is a name of a non-field
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   158
                    # that allows sorting.
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   159
                    try:
323
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   160
                        if callable(field_name):
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   161
                            attr = field_name
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   162
                        elif hasattr(self.model_admin, field_name):
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   163
                            attr = getattr(self.model_admin, field_name)
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   164
                        else:
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   165
                            attr = getattr(self.model, field_name)
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   166
                        order_field = attr.admin_order_field
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   167
                    except AttributeError:
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   168
                        pass
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   169
                else:
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   170
                    order_field = f.name
54
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   171
            except (IndexError, ValueError):
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   172
                pass # Invalid ordering specified. Just use the default.
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   173
        if ORDER_TYPE_VAR in params and params[ORDER_TYPE_VAR] in ('asc', 'desc'):
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   174
            order_type = params[ORDER_TYPE_VAR]
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   175
        return order_field, order_type
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   176
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   177
    def get_query_set(self):
323
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   178
        qs = self.root_query_set
54
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   179
        lookup_params = self.params.copy() # a dictionary of the query string
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   180
        for i in (ALL_VAR, ORDER_VAR, ORDER_TYPE_VAR, SEARCH_VAR, IS_POPUP_VAR):
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   181
            if i in lookup_params:
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   182
                del lookup_params[i]
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   183
        for key, value in lookup_params.items():
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   184
            if not isinstance(key, str):
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   185
                # 'key' will be used as a keyword argument later, so Python
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   186
                # requires it to be a string.
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   187
                del lookup_params[key]
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   188
                lookup_params[smart_str(key)] = value
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   189
323
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   190
            # if key ends with __in, split parameter into separate values
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diff changeset
   191
            if key.endswith('__in'):
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parents: 54
diff changeset
   192
                lookup_params[key] = value.split(',')
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parents: 54
diff changeset
   193
54
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   194
        # Apply lookup parameters from the query string.
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diff changeset
   195
        qs = qs.filter(**lookup_params)
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   196
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   197
        # Use select_related() if one of the list_display options is a field
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diff changeset
   198
        # with a relationship.
323
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diff changeset
   199
        if self.list_select_related:
54
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   200
            qs = qs.select_related()
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   201
        else:
323
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   202
            for field_name in self.list_display:
54
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   203
                try:
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   204
                    f = self.lookup_opts.get_field(field_name)
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   205
                except models.FieldDoesNotExist:
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   206
                    pass
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diff changeset
   207
                else:
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   208
                    if isinstance(f.rel, models.ManyToOneRel):
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   209
                        qs = qs.select_related()
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   210
                        break
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diff changeset
   211
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   212
        # Set ordering.
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   213
        if self.order_field:
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   214
            qs = qs.order_by('%s%s' % ((self.order_type == 'desc' and '-' or ''), self.order_field))
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   215
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   216
        # Apply keyword searches.
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   217
        def construct_search(field_name):
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diff changeset
   218
            if field_name.startswith('^'):
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   219
                return "%s__istartswith" % field_name[1:]
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diff changeset
   220
            elif field_name.startswith('='):
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   221
                return "%s__iexact" % field_name[1:]
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   222
            elif field_name.startswith('@'):
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   223
                return "%s__search" % field_name[1:]
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diff changeset
   224
            else:
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   225
                return "%s__icontains" % field_name
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   226
323
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diff changeset
   227
        if self.search_fields and self.query:
54
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diff changeset
   228
            for bit in self.query.split():
323
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diff changeset
   229
                or_queries = [models.Q(**{construct_search(field_name): bit}) for field_name in self.search_fields]
54
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   230
                other_qs = QuerySet(self.model)
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diff changeset
   231
                other_qs.dup_select_related(qs)
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diff changeset
   232
                other_qs = other_qs.filter(reduce(operator.or_, or_queries))
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diff changeset
   233
                qs = qs & other_qs
323
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diff changeset
   234
            for field_name in self.search_fields:
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diff changeset
   235
                if '__' in field_name:
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diff changeset
   236
                    qs = qs.distinct()
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diff changeset
   237
                    break
54
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diff changeset
   238
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diff changeset
   239
        if self.opts.one_to_one_field:
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diff changeset
   240
            qs = qs.complex_filter(self.opts.one_to_one_field.rel.limit_choices_to)
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diff changeset
   241
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   242
        return qs
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diff changeset
   243
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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   244
    def url_for_result(self, result):
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff changeset
   245
        return "%s/" % quote(getattr(result, self.pk_attname))