Merge pull request #393 from wpjunior/queryset_select
select method in Queryset
This commit is contained in:
Ross Lawley
commit
318b42dff2
@ -314,6 +314,79 @@ class QueryFieldList(object):
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def __nonzero__(self):
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return bool(self.fields)
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class ListResult(object):
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"""
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Used for .values_list method in QuerySet
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"""
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def __init__(self, document_type, cursor, fields, dbfields):
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from base import BaseField
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from fields import ReferenceField, GenericReferenceField
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# Caches for optimization
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self.ReferenceField = ReferenceField
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self.GenericReferenceField = GenericReferenceField
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self._cursor = cursor
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f = []
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for field, dbfield in itertools.izip(fields, dbfields):
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p = document_type
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for path in field.split('.'):
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if p and isinstance(p, BaseField):
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p = p.lookup_member(path)
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elif p:
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p = getattr(p, path)
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else:
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break
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f.append((dbfield.split('.'), p))
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self._fields = f
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def _get_value(self, keys, field_type, data):
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for key in keys:
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if data:
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data = data.get(key)
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else:
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break
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if isinstance(field_type, self.ReferenceField):
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doc_type = field_type.document_type
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data = doc_type._get_db().dereference(data)
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if data:
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return doc_type._from_son(data)
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elif isinstance(field_type, self.GenericReferenceField):
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if data and isinstance(data, (dict, pymongo.dbref.DBRef)):
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return field_type.dereference(data)
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return field_type.to_python(data)
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def next(self):
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try:
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data = self._cursor.next()
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return [self._get_value(k, t, data)
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for k, t in self._fields]
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except StopIteration, e:
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self.rewind()
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raise e
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def rewind(self):
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self._cursor.rewind()
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def count(self):
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"""
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Count the selected elements in the query.
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"""
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return self._cursor.count(with_limit_and_skip=True)
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def __len__(self):
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return self.count()
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def __iter__(self):
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return self
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class QuerySet(object):
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"""A set of results returned from a query. Wraps a MongoDB cursor,
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@ -548,33 +621,38 @@ class QuerySet(object):
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cursor_args['fields'] = self._loaded_fields.as_dict()
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return cursor_args
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@property
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def _cursor(self):
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if self._cursor_obj is None:
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self._cursor_obj = self._collection.find(self._query,
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**self._cursor_args)
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def _build_cursor(self, **cursor_args):
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obj = self._collection.find(self._query,
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**cursor_args)
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# Apply where clauses to cursor
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if self._where_clause:
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self._cursor_obj.where(self._where_clause)
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obj.where(self._where_clause)
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# apply default ordering
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if self._ordering:
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self._cursor_obj.sort(self._ordering)
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obj.sort(self._ordering)
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elif self._document._meta['ordering']:
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self.order_by(*self._document._meta['ordering'])
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self._ordering = self._get_order_key_list(
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*self._document._meta['ordering'])
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obj.sort(self._ordering)
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if self._limit is not None:
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self._cursor_obj.limit(self._limit)
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obj.limit(self._limit)
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if self._skip is not None:
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self._cursor_obj.skip(self._skip)
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obj.skip(self._skip)
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if self._hint != -1:
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self._cursor_obj.hint(self._hint)
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obj.hint(self._hint)
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return obj
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@property
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def _cursor(self):
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if self._cursor_obj is None:
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self._cursor_obj = self._build_cursor(**self._cursor_args)
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return self._cursor_obj
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@classmethod
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def _lookup_field(cls, document, parts):
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"""Lookup a field based on its attribute and return a list containing
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@ -803,6 +881,19 @@ class QuerySet(object):
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doc.save()
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return doc
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def values_list(self, *fields):
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"""
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make a list of elements
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.. versionadded:: 0.6
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"""
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dbfields = self._fields_to_dbfields(fields)
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cursor_args = self._cursor_args
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cursor_args['fields'] = dbfields
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cursor = self._build_cursor(**cursor_args)
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return ListResult(self._document, cursor, fields, dbfields)
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def first(self):
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"""Retrieve the first object matching the query.
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"""
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@ -1163,13 +1254,9 @@ class QuerySet(object):
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ret.append(field)
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return ret
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def order_by(self, *keys):
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"""Order the :class:`~mongoengine.queryset.QuerySet` by the keys. The
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order may be specified by prepending each of the keys by a + or a -.
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Ascending order is assumed.
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:param keys: fields to order the query results by; keys may be
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prefixed with **+** or **-** to determine the ordering direction
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def _get_order_key_list(self, *keys):
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"""
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Build order list for query
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"""
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key_list = []
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for key in keys:
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@ -1186,6 +1273,18 @@ class QuerySet(object):
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pass
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key_list.append((key, direction))
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return key_list
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def order_by(self, *keys):
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"""Order the :class:`~mongoengine.queryset.QuerySet` by the keys. The
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order may be specified by prepending each of the keys by a + or a -.
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Ascending order is assumed.
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:param keys: fields to order the query results by; keys may be
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prefixed with **+** or **-** to determine the ordering direction
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"""
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key_list = self._get_order_key_list(*keys)
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self._ordering = key_list
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self._cursor.sort(key_list)
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return self
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@ -2910,5 +2910,159 @@ class QueryFieldListTest(unittest.TestCase):
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ak = list(Bar.objects(foo__match={'shape': "square", "color": "purple"}))
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self.assertEqual([b1], ak)
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def test_values_list(self):
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class TestDoc(Document):
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x = IntField()
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y = BooleanField()
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TestDoc.drop_collection()
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TestDoc(x=10, y=True).save()
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TestDoc(x=20, y=False).save()
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TestDoc(x=30, y=True).save()
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plist = list(TestDoc.objects.values_list('x', 'y'))
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self.assertEqual(len(plist), 3)
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self.assertEqual(plist[0], [10, True])
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self.assertEqual(plist[1], [20, False])
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self.assertEqual(plist[2], [30, True])
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class UserDoc(Document):
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name = StringField()
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age = IntField()
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UserDoc.drop_collection()
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UserDoc(name="Wilson Jr", age=19).save()
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UserDoc(name="Wilson", age=43).save()
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UserDoc(name="Eliana", age=37).save()
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UserDoc(name="Tayza", age=15).save()
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ulist = list(UserDoc.objects.values_list('name', 'age'))
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self.assertEqual(ulist, [
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[u'Wilson Jr', 19],
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[u'Wilson', 43],
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[u'Eliana', 37],
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[u'Tayza', 15]])
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ulist = list(UserDoc.objects.order_by('age').values_list('name'))
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self.assertEqual(ulist, [
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[u'Tayza'],
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[u'Wilson Jr'],
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[u'Eliana'],
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[u'Wilson']])
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def test_values_list_embedded(self):
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class Profile(EmbeddedDocument):
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name = StringField()
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age = IntField()
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class Locale(EmbeddedDocument):
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city = StringField()
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country = StringField()
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class Person(Document):
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profile = EmbeddedDocumentField(Profile)
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locale = EmbeddedDocumentField(Locale)
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Person.drop_collection()
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Person(profile=Profile(name="Wilson Jr", age=19),
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locale=Locale(city="Corumba-GO", country="Brazil")).save()
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Person(profile=Profile(name="Gabriel Falcao", age=23),
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locale=Locale(city="New York", country="USA")).save()
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Person(profile=Profile(name="Lincoln de souza", age=28),
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locale=Locale(city="Belo Horizonte", country="Brazil")).save()
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Person(profile=Profile(name="Walter cruz", age=30),
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locale=Locale(city="Brasilia", country="Brazil")).save()
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self.assertEqual(
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list(Person.objects.order_by('profile.age').values_list('profile.name')),
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[[u'Wilson Jr'], [u'Gabriel Falcao'],
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[u'Lincoln de souza'], [u'Walter cruz']])
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ulist = list(Person.objects.order_by('locale.city')
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.values_list('profile.name', 'profile.age', 'locale.city'))
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self.assertEqual(ulist,
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[[u'Lincoln de souza', 28, u'Belo Horizonte'],
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[u'Walter cruz', 30, u'Brasilia'],
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[u'Wilson Jr', 19, u'Corumba-GO'],
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[u'Gabriel Falcao', 23, u'New York']])
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def test_values_list_decimal(self):
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from decimal import Decimal
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class Person(Document):
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name = StringField()
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rating = DecimalField()
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Person.drop_collection()
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Person(name="Wilson Jr", rating=Decimal('1.0')).save()
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ulist = list(Person.objects.values_list('name', 'rating'))
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self.assertEqual(ulist, [[u'Wilson Jr', Decimal('1.0')]])
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def test_values_list_reference_field(self):
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class State(Document):
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name = StringField()
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class Person(Document):
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name = StringField()
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state = ReferenceField(State)
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State.drop_collection()
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Person.drop_collection()
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s1 = State(name="Goias")
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s1.save()
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Person(name="Wilson JR", state=s1).save()
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plist = list(Person.objects.values_list('name', 'state'))
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self.assertEqual(plist, [[u'Wilson JR', s1]])
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def test_values_list_generic_reference_field(self):
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class State(Document):
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name = StringField()
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class Person(Document):
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name = StringField()
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state = GenericReferenceField()
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State.drop_collection()
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Person.drop_collection()
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s1 = State(name="Goias")
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s1.save()
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Person(name="Wilson JR", state=s1).save()
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plist = list(Person.objects.values_list('name', 'state'))
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self.assertEqual(plist, [[u'Wilson JR', s1]])
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def test_values_list_db_field(self):
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class TestDoc(Document):
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x = IntField(db_field="y")
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y = BooleanField(db_field="x")
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TestDoc.drop_collection()
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TestDoc(x=10, y=True).save()
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TestDoc(x=20, y=False).save()
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TestDoc(x=30, y=True).save()
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plist = list(TestDoc.objects.values_list('x', 'y'))
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self.assertEqual(len(plist), 3)
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self.assertEqual(plist[0], [10, True])
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self.assertEqual(plist[1], [20, False])
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self.assertEqual(plist[2], [30, True])
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if __name__ == '__main__':
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unittest.main()
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