def usage_for_model(self,
model,
counts=False,
min_count=None,
filters=None,
extra=None):
"""
Obtain a list of tags associated with instances of the given
Model class.
If ``counts`` is True, a ``count`` attribute will be added to
each tag, indicating how many times it has been used against
the Model class in question.
If ``min_count`` is given, only tags which have a ``count``
greater than or equal to ``min_count`` will be returned.
Passing a value for ``min_count`` implies ``counts=True``.
To limit the tags (and counts, if specified) returned to those
used by a subset of the Model's instances, pass a dictionary
of field lookups to be applied to the given Model as the
``filters`` argument.
"""
if extra is None: extra = {}
if filters is None: filters = {}
if not parse_lookup:
# post-queryset-refactor (hand off to usage_for_queryset)
queryset = model._default_manager.filter()
for f in filters.items():
queryset.query.add_filter(f)
usage = self.usage_for_queryset(queryset, counts, min_count, extra)
else:
# pre-queryset-refactor
extra_joins = ''
extra_criteria = ''
params = []
if len(filters) > 0:
joins, where, params = parse_lookup(filters.items(),
model._meta)
extra_joins = ' '.join([
'%s %s AS %s ON %s' % (join_type, table, alias, condition)
for (alias, (table, join_type,
condition)) in joins.items()
])
extra_criteria = 'AND %s' % (' AND '.join(where))
usage = self._get_usage(model, counts, min_count, extra_joins,
extra_criteria, params, extra)
return usage
def usage_for_model(self, model, counts=False, min_count=None, filters=None):
"""
Obtain a list of tags associated with instances of the given
Model class.
If ``counts`` is True, a ``count`` attribute will be added to
each tag, indicating how many times it has been used against
the Model class in question.
If ``min_count`` is given, only tags which have a ``count``
greater than or equal to ``min_count`` will be returned.
Passing a value for ``min_count`` implies ``counts=True``.
To limit the tags (and counts, if specified) returned to those
used by a subset of the Model's instances, pass a dictionary
of field lookups to be applied to the given Model as the
``filters`` argument.
"""
if filters is None:
filters = {}
if not parse_lookup:
# post-queryset-refactor (hand off to usage_for_queryset)
queryset = model._default_manager.filter()
for f in filters.items():
queryset.query.add_filter(f)
usage = self.usage_for_queryset(queryset, counts, min_count)
else:
# pre-queryset-refactor
extra_joins = ""
extra_criteria = ""
params = []
if len(filters) > 0:
joins, where, params = parse_lookup(filters.items(), model._meta)
extra_joins = " ".join(
[
"%s %s AS %s ON %s" % (join_type, table, alias, condition)
for (alias, (table, join_type, condition)) in joins.items()
]
)
extra_criteria = "AND %s" % (" AND ".join(where))
usage = self._get_usage(model, counts, min_count, extra_joins, extra_criteria, params)
return usage
def usage_for_model(self,
Model,
counts=False,
min_count=None,
filters=None):
"""
Obtain a list of tags associated with instances of the given
Model.
If ``counts`` is True, a ``count`` attribute will be added to
each tag, indicating how many times it has been used against
the Model in question.
If ``min_count`` is given, only tags which have a ``count``
greater than or equal to ``min_count`` will be returned.
Passing a value for ``min_count`` implies ``counts=True``.
To limit the tags (and counts, if specified) returned to those
used by a subset of the Model's instances, pass a dictionary
of field lookups to be applied to the given Model as the
``filters`` argument.
"""
if filters is None: filters = {}
if min_count is not None: counts = True
model_table = backend.quote_name(Model._meta.db_table)
model_pk = '%s.%s' % (model_table,
backend.quote_name(Model._meta.pk.column))
query = """
SELECT DISTINCT %(tag)s.id, %(tag)s.name%(count_sql)s
FROM
%(tag)s
INNER JOIN %(tagged_item)s
ON %(tag)s.id = %(tagged_item)s.tag_id
INNER JOIN %(model)s
ON %(tagged_item)s.object_id = %(model_pk)s
%%s
WHERE %(tagged_item)s.content_type_id = %(content_type_id)s
%%s
GROUP BY %(tag)s.id, %(tag)s.name
%%s
ORDER BY %(tag)s.name ASC""" % {
'tag':
backend.quote_name(self.model._meta.db_table),
'count_sql':
counts and (', COUNT(%s)' % model_pk) or '',
'tagged_item':
backend.quote_name(
self._get_related_model_by_accessor('items')._meta.db_table),
'model':
model_table,
'model_pk':
model_pk,
'content_type_id':
ContentType.objects.get_for_model(Model).id,
}
extra_joins = ''
extra_criteria = ''
min_count_sql = ''
params = []
if len(filters) > 0:
joins, where, params = parse_lookup(filters.items(), Model._meta)
extra_joins = ' '.join([
'%s %s AS %s ON %s' % (join_type, table, alias, condition)
for (alias, (table, join_type, condition)) in joins.items()
])
extra_criteria = 'AND %s' % (' AND '.join(where))
if min_count is not None:
min_count_sql = 'HAVING COUNT(%s) >= %%s' % model_pk
params.append(min_count)
cursor = connection.cursor()
cursor.execute(query % (extra_joins, extra_criteria, min_count_sql),
params)
tags = []
for row in cursor.fetchall():
t = self.model(*row[:2])
if counts:
t.count = row[2]
tags.append(t)
return tags
def usage_for_model(self, model, counts=False, min_count=None, filters=None):
"""
Obtain a list of tags associated with instances of the given
Model class.
If ``counts`` is True, a ``count`` attribute will be added to
each tag, indicating how many times it has been used against
the Model class in question.
If ``min_count`` is given, only tags which have a ``count``
greater than or equal to ``min_count`` will be returned.
Passing a value for ``min_count`` implies ``counts=True``.
To limit the tags (and counts, if specified) returned to those
used by a subset of the Model's instances, pass a dictionary
of field lookups to be applied to the given Model as the
``filters`` argument.
"""
if filters is None: filters = {}
if min_count is not None: counts = True
model_table = qn(model._meta.db_table)
model_pk = '%s.%s' % (model_table, qn(model._meta.pk.column))
query = """
SELECT DISTINCT %(tag)s.id, %(tag)s.name%(count_sql)s
FROM
%(tag)s
INNER JOIN %(tagged_item)s
ON %(tag)s.id = %(tagged_item)s.tag_id
INNER JOIN %(model)s
ON %(tagged_item)s.object_id = %(model_pk)s
%%s
WHERE %(tagged_item)s.content_type_id = %(content_type_id)s
%%s
GROUP BY %(tag)s.id, %(tag)s.name
%%s
ORDER BY %(tag)s.name ASC""" % {
'tag': qn(self.model._meta.db_table),
'count_sql': counts and (', COUNT(%s)' % model_pk) or '',
'tagged_item': qn(self._get_related_model_by_accessor('items')._meta.db_table),
'model': model_table,
'model_pk': model_pk,
'content_type_id': ContentType.objects.get_for_model(model).pk,
}
extra_joins = ''
extra_criteria = ''
min_count_sql = ''
params = []
if len(filters) > 0:
joins, where, params = parse_lookup(filters.items(), model._meta)
extra_joins = ' '.join(['%s %s AS %s ON %s' % (join_type, table, alias, condition)
for (alias, (table, join_type, condition)) in joins.items()])
extra_criteria = 'AND %s' % (' AND '.join(where))
if min_count is not None:
min_count_sql = 'HAVING COUNT(%s) >= %%s' % model_pk
params.append(min_count)
cursor = connection.cursor()
cursor.execute(query % (extra_joins, extra_criteria, min_count_sql), params)
tags = []
for row in cursor.fetchall():
t = self.model(*row[:2])
if counts:
t.count = row[2]
tags.append(t)
return tags
