Ticket #11305: poc_11305-3.patch

File poc_11305-3.patch, 27.8 KB (added by nate_b, 3 years ago)

Update for a clean apply.

  • django/db/models/aggregates.py

    diff --git a/django/db/models/aggregates.py b/django/db/models/aggregates.py
    index a2349cf..d816aa7 100644
    a b class Aggregate(object): 
    66    """
    77    Default Aggregate definition.
    88    """
    9     def __init__(self, lookup, **extra):
     9    def __init__(self, lookup, only=None, **extra):
    1010        """Instantiate a new aggregate.
    1111
    1212         * lookup is the field on which the aggregate operates.
     13         * only is a Q-object used in conditional aggregation.
    1314         * extra is a dictionary of additional data to provide for the
    1415           aggregate definition
    1516
    class Aggregate(object): 
    1819        """
    1920        self.lookup = lookup
    2021        self.extra = extra
     22        self.only = only
     23        self.condition = None
    2124
    2225    def _default_alias(self):
     26        if hasattr(self.lookup, 'evaluate'):
     27             raise ValueError('When aggregating over an expression, you need to give an alias.')
    2328        return '%s__%s' % (self.lookup, self.name.lower())
    2429    default_alias = property(_default_alias)
    2530
    class Aggregate(object): 
    4247           summary value rather than an annotation.
    4348        """
    4449        klass = getattr(query.aggregates_module, self.name)
    45         aggregate = klass(col, source=source, is_summary=is_summary, **self.extra)
     50        aggregate = klass(col, source=source, is_summary=is_summary, condition=self.condition, **self.extra)
    4651        query.aggregates[alias] = aggregate
    4752
    4853class Avg(Aggregate):
  • django/db/models/expressions.py

    diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
    index a71f4a3..390f475 100644
    a b class ExpressionNode(tree.Node): 
    3939    # VISITOR METHODS #
    4040    ###################
    4141
    42     def prepare(self, evaluator, query, allow_joins):
    43         return evaluator.prepare_node(self, query, allow_joins)
     42    def prepare(self, evaluator, query, allow_joins, promote_joins=False):
     43        return evaluator.prepare_node(self, query, allow_joins, promote_joins)
    4444
    4545    def evaluate(self, evaluator, qn, connection):
    4646        return evaluator.evaluate_node(self, qn, connection)
    class F(ExpressionNode): 
    107107        obj.name = self.name
    108108        return obj
    109109
    110     def prepare(self, evaluator, query, allow_joins):
    111         return evaluator.prepare_leaf(self, query, allow_joins)
     110    def prepare(self, evaluator, query, allow_joins, promote_joins=False):
     111        return evaluator.prepare_leaf(self, query, allow_joins, promote_joins)
    112112
    113113    def evaluate(self, evaluator, qn, connection):
    114114        return evaluator.evaluate_leaf(self, qn, connection)
  • django/db/models/sql/aggregates.py

    diff --git a/django/db/models/sql/aggregates.py b/django/db/models/sql/aggregates.py
    index 207bc0c..45f9104 100644
    a b  
    11"""
    22Classes to represent the default SQL aggregate functions
    33"""
     4from django.db.models.sql.expressions import SQLEvaluator
    45
    56class AggregateField(object):
    67    """An internal field mockup used to identify aggregates in the
    class Aggregate(object): 
    2223    is_ordinal = False
    2324    is_computed = False
    2425    sql_template = '%(function)s(%(field)s)'
     26    conditional_template = "CASE WHEN %(condition)s THEN %(field_name)s ELSE null END"
    2527
    26     def __init__(self, col, source=None, is_summary=False, **extra):
     28    def __init__(self, col, source=None, is_summary=False, condition=None, **extra):
    2729        """Instantiate an SQL aggregate
    2830
    2931         * col is a column reference describing the subject field
    class Aggregate(object): 
    3335           the column reference. If the aggregate is not an ordinal or
    3436           computed type, this reference is used to determine the coerced
    3537           output type of the aggregate.
     38         * condition is used in conditional aggregation
    3639         * extra is a dictionary of additional data to provide for the
    3740           aggregate definition
    3841
    class Aggregate(object): 
    5255        self.source = source
    5356        self.is_summary = is_summary
    5457        self.extra = extra
     58        self.condition = condition
    5559
    5660        # Follow the chain of aggregate sources back until you find an
    5761        # actual field, or an aggregate that forces a particular output
    class Aggregate(object): 
    6670                tmp = computed_aggregate_field
    6771            else:
    6872                tmp = tmp.source
    69 
     73       
     74        # We don't know the real source of this aggregate, and the
     75        # aggregate doesn't define ordinal or computed either. So
     76        # we default to computed for these cases.
     77        if tmp is None:
     78            tmp = computed_aggregate_field
    7079        self.field = tmp
    7180
     81
    7282    def relabel_aliases(self, change_map):
    7383        if isinstance(self.col, (list, tuple)):
    7484            self.col = (change_map.get(self.col[0], self.col[0]), self.col[1])
     85        else:
     86            self.col.relabel_aliases(change_map)
     87        if self.condition:
     88            self.condition.relabel_aliases(change_map)
    7589
    7690    def as_sql(self, qn, connection):
    7791        "Return the aggregate, rendered as SQL."
    7892
     93        condition_params = []
     94        col_params = []
    7995        if hasattr(self.col, 'as_sql'):
    80             field_name = self.col.as_sql(qn, connection)
     96            if isinstance(self.col, SQLEvaluator):
     97                field_name, col_params = self.col.as_sql(qn, connection)
     98            else:
     99                field_name = self.col.as_sql(qn, connection)
     100           
    81101        elif isinstance(self.col, (list, tuple)):
    82102            field_name = '.'.join([qn(c) for c in self.col])
    83103        else:
    84104            field_name = self.col
    85 
    86         params = {
    87             'function': self.sql_function,
    88             'field': field_name
    89         }
     105        if self.condition:
     106            condition, condition_params = self.condition.as_sql(qn, connection)
     107            conditional_field = self.conditional_template % {
     108                'condition': condition,
     109                'field_name': field_name
     110            }
     111            params = {
     112                'function': self.sql_function,
     113                'field': conditional_field,
     114            }
     115        else:
     116            params = {
     117                'function': self.sql_function,
     118                'field': field_name
     119            }
    90120        params.update(self.extra)
    91 
    92         return self.sql_template % params
     121        condition_params.extend(col_params)
     122        return (self.sql_template % params, condition_params)
    93123
    94124
    95125class Avg(Aggregate):
  • django/db/models/sql/compiler.py

    diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
    index 72948f9..bf3cb25 100644
    a b class SQLCompiler(object): 
    6868        # as the pre_sql_setup will modify query state in a way that forbids
    6969        # another run of it.
    7070        self.refcounts_before = self.query.alias_refcount.copy()
    71         out_cols = self.get_columns(with_col_aliases)
     71        out_cols, c_params = self.get_columns(with_col_aliases)
    7272        ordering, ordering_group_by = self.get_ordering()
    7373
    7474        distinct_fields = self.get_distinct()
    class SQLCompiler(object): 
    8484        params = []
    8585        for val in self.query.extra_select.itervalues():
    8686            params.extend(val[1])
     87        # Extra-select comes before aggregation in the select list
     88        params.extend(c_params)
    8789
    8890        result = ['SELECT']
    8991
    class SQLCompiler(object): 
    178180        qn = self.quote_name_unless_alias
    179181        qn2 = self.connection.ops.quote_name
    180182        result = ['(%s) AS %s' % (col[0], qn2(alias)) for alias, col in self.query.extra_select.iteritems()]
     183        query_params = []
    181184        aliases = set(self.query.extra_select.keys())
    182185        if with_aliases:
    183186            col_aliases = aliases.copy()
    class SQLCompiler(object): 
    220223            aliases.update(new_aliases)
    221224
    222225        max_name_length = self.connection.ops.max_name_length()
    223         result.extend([
    224             '%s%s' % (
    225                 aggregate.as_sql(qn, self.connection),
    226                 alias is not None
    227                     and ' AS %s' % qn(truncate_name(alias, max_name_length))
    228                     or ''
     226        for alias, aggregate in self.query.aggregate_select.items():
     227            sql, params = aggregate.as_sql(qn, self.connection)
     228            result.append(
     229                '%s%s' % (
     230                    sql,
     231                    alias is not None
     232                       and ' AS %s' % qn(truncate_name(alias, max_name_length))
     233                       or ''
     234                )
    229235            )
    230             for alias, aggregate in self.query.aggregate_select.items()
    231         ])
     236            query_params.extend(params)
    232237
    233238        for table, col in self.query.related_select_cols:
    234239            r = '%s.%s' % (qn(table), qn(col))
    class SQLCompiler(object): 
    243248                col_aliases.add(col)
    244249
    245250        self._select_aliases = aliases
    246         return result
     251        return result, query_params
    247252
    248253    def get_default_columns(self, with_aliases=False, col_aliases=None,
    249254            start_alias=None, opts=None, as_pairs=False, local_only=False):
    class SQLAggregateCompiler(SQLCompiler): 
    10461051        """
    10471052        if qn is None:
    10481053            qn = self.quote_name_unless_alias
     1054        buf = []
     1055        a_params = []
     1056        for aggregate in self.query.aggregate_select.values():
     1057            sql, query_params = aggregate.as_sql(qn, self.connection)
     1058            buf.append(sql)
     1059            a_params.extend(query_params)
     1060        aggregate_sql = ', '.join(buf)
    10491061
    10501062        sql = ('SELECT %s FROM (%s) subquery' % (
    1051             ', '.join([
    1052                 aggregate.as_sql(qn, self.connection)
    1053                 for aggregate in self.query.aggregate_select.values()
    1054             ]),
     1063            aggregate_sql, 
    10551064            self.query.subquery)
    10561065        )
    1057         params = self.query.sub_params
     1066        params = tuple(a_params) + (self.query.sub_params)
    10581067        return (sql, params)
    10591068
    10601069class SQLDateCompiler(SQLCompiler):
  • django/db/models/sql/expressions.py

    diff --git a/django/db/models/sql/expressions.py b/django/db/models/sql/expressions.py
    index 1bbf742..3df33f0 100644
    a b from django.db.models.fields import FieldDoesNotExist 
    33from django.db.models.sql.constants import LOOKUP_SEP
    44
    55class SQLEvaluator(object):
    6     def __init__(self, expression, query, allow_joins=True):
     6    def __init__(self, expression, query, allow_joins=True, promote_joins=False):
    77        self.expression = expression
    88        self.opts = query.get_meta()
    99        self.cols = {}
    1010
    1111        self.contains_aggregate = False
    12         self.expression.prepare(self, query, allow_joins)
     12        self.expression.prepare(self, query, allow_joins, promote_joins)
    1313
    1414    def prepare(self):
    1515        return self
    class SQLEvaluator(object): 
    2828    # Vistor methods for initial expression preparation #
    2929    #####################################################
    3030
    31     def prepare_node(self, node, query, allow_joins):
     31    def prepare_node(self, node, query, allow_joins, promote_joins):
    3232        for child in node.children:
    3333            if hasattr(child, 'prepare'):
    34                 child.prepare(self, query, allow_joins)
     34                child.prepare(self, query, allow_joins, promote_joins)
    3535
    36     def prepare_leaf(self, node, query, allow_joins):
     36    def prepare_leaf(self, node, query, allow_joins, promote_joins):
    3737        if not allow_joins and LOOKUP_SEP in node.name:
    3838            raise FieldError("Joined field references are not permitted in this query")
    3939
    class SQLEvaluator(object): 
    4848                    field_list, query.get_meta(),
    4949                    query.get_initial_alias(), False)
    5050                col, _, join_list = query.trim_joins(source, join_list, last, False)
     51                if promote_joins:
     52                    for column_alias in join_list:
     53                        query.promote_alias(column_alias, unconditional=True)
    5154
    5255                self.cols[node] = (join_list[-1], col)
    5356            except FieldDoesNotExist:
    class SQLEvaluator(object): 
    6568        for child in node.children:
    6669            if hasattr(child, 'evaluate'):
    6770                sql, params = child.evaluate(self, qn, connection)
     71                if isinstance(sql, tuple):
     72                    expression_params.extend(sql[1])
     73                    sql = sql[0]
    6874            else:
    6975                sql, params = '%s', (child,)
    7076
  • django/db/models/sql/query.py

    diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
    index ed2bc06..6074ed1 100644
    a b class Query(object): 
    987987        Adds a single aggregate expression to the Query
    988988        """
    989989        opts = model._meta
    990         field_list = aggregate.lookup.split(LOOKUP_SEP)
    991         if len(field_list) == 1 and aggregate.lookup in self.aggregates:
    992             # Aggregate is over an annotation
    993             field_name = field_list[0]
    994             col = field_name
    995             source = self.aggregates[field_name]
    996             if not is_summary:
    997                 raise FieldError("Cannot compute %s('%s'): '%s' is an aggregate" % (
    998                     aggregate.name, field_name, field_name))
    999         elif ((len(field_list) > 1) or
    1000             (field_list[0] not in [i.name for i in opts.fields]) or
    1001             self.group_by is None or
    1002             not is_summary):
    1003             # If:
    1004             #   - the field descriptor has more than one part (foo__bar), or
    1005             #   - the field descriptor is referencing an m2m/m2o field, or
    1006             #   - this is a reference to a model field (possibly inherited), or
    1007             #   - this is an annotation over a model field
    1008             # then we need to explore the joins that are required.
    1009 
    1010             field, source, opts, join_list, last, _ = self.setup_joins(
    1011                 field_list, opts, self.get_initial_alias(), False)
    1012 
    1013             # Process the join chain to see if it can be trimmed
    1014             col, _, join_list = self.trim_joins(source, join_list, last, False)
    1015 
    1016             # If the aggregate references a model or field that requires a join,
    1017             # those joins must be LEFT OUTER - empty join rows must be returned
    1018             # in order for zeros to be returned for those aggregates.
    1019             for column_alias in join_list:
    1020                 self.promote_alias(column_alias, unconditional=True)
    1021 
    1022             col = (join_list[-1], col)
     990        only = aggregate.only
     991        if hasattr(aggregate.lookup, 'evaluate'):
     992            # If lookup is a query expression, evaluate it
     993            col = SQLEvaluator(aggregate.lookup, self, promote_joins=True)
     994            # TODO: find out the real source of this field. If any field has
     995            # is_computed, then source can be set to is_computed.
     996            source = None
    1023997        else:
    1024             # The simplest cases. No joins required -
    1025             # just reference the provided column alias.
    1026             field_name = field_list[0]
    1027             source = opts.get_field(field_name)
    1028             col = field_name
    1029 
     998            field_list = aggregate.lookup.split(LOOKUP_SEP)
     999            join_list = []
     1000            if len(field_list) == 1 and aggregate.lookup in self.aggregates:
     1001                # Aggregate is over an annotation
     1002                field_name = field_list[0]
     1003                col = field_name
     1004                source = self.aggregates[field_name]
     1005                if not is_summary:
     1006                    raise FieldError("Cannot compute %s('%s'): '%s' is an aggregate" % (
     1007                        aggregate.name, field_name, field_name))
     1008                if only:
     1009                    raise FieldError("Cannot use aggregated fields in conditional aggregates")
     1010            elif ((len(field_list) > 1) or
     1011                (field_list[0] not in [i.name for i in opts.fields]) or
     1012                self.group_by is None or
     1013                not is_summary):
     1014                # If:
     1015                #   - the field descriptor has more than one part (foo__bar), or
     1016                #   - the field descriptor is referencing an m2m/m2o field, or
     1017                #   - this is a reference to a model field (possibly inherited), or
     1018                #   - this is an annotation over a model field
     1019                # then we need to explore the joins that are required.
     1020
     1021                field, source, opts, join_list, last, _ = self.setup_joins(
     1022                    field_list, opts, self.get_initial_alias(), False)
     1023
     1024                # Process the join chain to see if it can be trimmed
     1025                col, _, join_list = self.trim_joins(source, join_list, last, False)
     1026
     1027                # If the aggregate references a model or field that requires a join,
     1028                # those joins must be LEFT OUTER - empty join rows must be returned
     1029                # in order for zeros to be returned for those aggregates.
     1030                for column_alias in join_list:
     1031                    self.promote_alias(column_alias, unconditional=True)
     1032
     1033                col = (join_list[-1], col)
     1034            else:
     1035                # The simplest cases. No joins required -
     1036                # just reference the provided column alias.
     1037                field_name = field_list[0]
     1038                source = opts.get_field(field_name)
     1039                col = field_name
     1040
     1041        if only:
     1042            original_where = self.where
     1043            original_having = self.having
     1044            aggregate.condition = self.where_class()
     1045            self.where = aggregate.condition
     1046            self.having = self.where_class()
     1047            original_alias_map = self.alias_map.keys()[:]
     1048            self.add_q(only, used_aliases=set(original_alias_map))
     1049            if original_alias_map != self.alias_map.keys():
     1050                raise FieldError("Aggregate's only condition can not require additional joins, Original joins: %s, joins after: %s" % (original_alias_map, self.alias_map.keys()))
     1051            if self.having.children:
     1052                raise FieldError("Aggregate's only condition can not reference annotated fields")
     1053            self.having = original_having
     1054            self.where = original_where
    10301055        # Add the aggregate to the query
    10311056        aggregate.add_to_query(self, alias, col=col, source=source, is_summary=is_summary)
    10321057
  • django/db/models/sql/where.py

    diff --git a/django/db/models/sql/where.py b/django/db/models/sql/where.py
    index 1455ba6..8b530bd 100644
    a b class WhereNode(tree.Node): 
    139139        it.
    140140        """
    141141        lvalue, lookup_type, value_annot, params_or_value = child
     142        additional_params = []
    142143        if hasattr(lvalue, 'process'):
    143144            try:
    144145                lvalue, params = lvalue.process(lookup_type, params_or_value, connection)
    class WhereNode(tree.Node): 
    153154        else:
    154155            # A smart object with an as_sql() method.
    155156            field_sql = lvalue.as_sql(qn, connection)
     157            if isinstance(field_sql, tuple):
     158                # It returned also params
     159                additional_params.extend(field_sql[1])
     160                field_sql = field_sql[0]
    156161
    157162        if value_annot is datetime.datetime:
    158163            cast_sql = connection.ops.datetime_cast_sql()
    class WhereNode(tree.Node): 
    161166
    162167        if hasattr(params, 'as_sql'):
    163168            extra, params = params.as_sql(qn, connection)
     169            if isinstance(extra, tuple):
     170                params = params + tuple(extra[1])
     171                extra = extra[0]
    164172            cast_sql = ''
    165173        else:
    166174            extra = ''
    class WhereNode(tree.Node): 
    170178            lookup_type = 'isnull'
    171179            value_annot = True
    172180
     181        additional_params.extend(params)
     182        params = additional_params
    173183        if lookup_type in connection.operators:
    174184            format = "%s %%s %%s" % (connection.ops.lookup_cast(lookup_type),)
    175185            return (format % (field_sql,
  • tests/modeltests/aggregation/tests.py

    diff --git a/tests/modeltests/aggregation/tests.py b/tests/modeltests/aggregation/tests.py
    index a35dbb3..058ba80 100644
    a b import datetime 
    44from decimal import Decimal
    55
    66from django.db.models import Avg, Sum, Count, Max, Min
     7from django.db.models import Q, F
     8from django.core.exceptions import FieldError
    79from django.test import TestCase, Approximate
    810
    911from .models import Author, Publisher, Book, Store
    class BaseAggregateTestCase(TestCase): 
    1820    def test_single_aggregate(self):
    1921        vals = Author.objects.aggregate(Avg("age"))
    2022        self.assertEqual(vals, {"age__avg": Approximate(37.4, places=1)})
     23        vals = Author.objects.aggregate(Sum("age", only=Q(age__gt=29)))
     24        self.assertEqual(vals, {"age__sum": 254})
     25        vals = Author.objects.extra(select={'testparams':'age < %s'}, select_params=[0])\
     26               .aggregate(Sum("age", only=Q(age__gt=29)))
     27        self.assertEqual(vals, {"age__sum": 254})
     28        vals = Author.objects.aggregate(Sum("age", only=Q(name__icontains='jaco')|Q(name__icontains='adrian')))
     29        self.assertEqual(vals, {"age__sum": 69})
    2130
    2231    def test_multiple_aggregates(self):
    2332        vals = Author.objects.aggregate(Sum("age"), Avg("age"))
    2433        self.assertEqual(vals, {"age__sum": 337, "age__avg": Approximate(37.4, places=1)})
     34        vals = Author.objects.aggregate(Sum("age", only=Q(age__gt=29)), Avg("age"))
     35        self.assertEqual(vals, {"age__sum": 254, "age__avg": Approximate(37.4, places=1)})
    2536
    2637    def test_filter_aggregate(self):
    2738        vals = Author.objects.filter(age__gt=29).aggregate(Sum("age"))
    2839        self.assertEqual(len(vals), 1)
    2940        self.assertEqual(vals["age__sum"], 254)
     41        vals = Author.objects.filter(age__gt=29).aggregate(Sum("age", only=Q(age__lt=29)))
     42        # If there are no matching aggregates, then None, not 0 is the answer.
     43        self.assertEqual(vals["age__sum"], None)
    3044
    3145    def test_related_aggregate(self):
    3246        vals = Author.objects.aggregate(Avg("friends__age"))
    3347        self.assertEqual(len(vals), 1)
    3448        self.assertAlmostEqual(vals["friends__age__avg"], 34.07, places=2)
    3549
     50        vals = Author.objects.aggregate(Avg("friends__age", only=Q(age__lt=29)))
     51        self.assertEqual(len(vals), 1)
     52        self.assertAlmostEqual(vals["friends__age__avg"], 33.67, places=2)
     53        vals2 = Author.objects.filter(age__lt=29).aggregate(Avg("friends__age"))
     54        self.assertEqual(vals, vals2)
     55
     56        vals = Author.objects.aggregate(Avg("friends__age", only=Q(friends__age__lt=35)))
     57        self.assertEqual(len(vals), 1)
     58        self.assertAlmostEqual(vals["friends__age__avg"], 28.75, places=2)
     59
     60        # The average age of author's friends, whose age is lower than the authors age.
     61        vals = Author.objects.aggregate(Avg("friends__age", only=Q(friends__age__lt=F('age'))))
     62        self.assertEqual(len(vals), 1)
     63        self.assertAlmostEqual(vals["friends__age__avg"], 30.43, places=2)
     64
    3665        vals = Book.objects.filter(rating__lt=4.5).aggregate(Avg("authors__age"))
    3766        self.assertEqual(len(vals), 1)
    3867        self.assertAlmostEqual(vals["authors__age__avg"], 38.2857, places=2)
    class BaseAggregateTestCase(TestCase): 
    5382        vals = Store.objects.aggregate(Max("books__authors__age"))
    5483        self.assertEqual(len(vals), 1)
    5584        self.assertEqual(vals["books__authors__age__max"], 57)
     85       
     86        vals = Store.objects.aggregate(Max("books__authors__age", only=Q(books__authors__age__lt=56)))
     87        self.assertEqual(len(vals), 1)
     88        self.assertEqual(vals["books__authors__age__max"], 46)
    5689
    5790        vals = Author.objects.aggregate(Min("book__publisher__num_awards"))
    5891        self.assertEqual(len(vals), 1)
    class BaseAggregateTestCase(TestCase): 
    84117        )
    85118        self.assertEqual(b.mean_age, 34.5)
    86119
     120        # Test extra-select
     121        books = Book.objects.annotate(mean_age=Avg("authors__age"))
     122        books = books.annotate(mean_age2=Avg('authors__age', only=Q(authors__age__gte=0)))
     123        books = books.extra(select={'testparams': 'publisher_id = %s'}, select_params=[1])
     124        b = books.get(pk=1)
     125        self.assertEqual(b.mean_age, 34.5)
     126        self.assertEqual(b.mean_age2, 34.5)
     127        self.assertEqual(b.testparams, True)
     128
     129        # Test relabel_aliases
     130        excluded_authors = Author.objects.annotate(book_rating=Min(F('book__rating') + 5, only=Q(pk__gte=1)))
     131        excluded_authors = excluded_authors.filter(book_rating__lt=0)
     132        books = books.exclude(authors__in=excluded_authors)
     133        b = books.get(pk=1)
     134        self.assertEqual(b.mean_age, 34.5)
     135
     136        # Test joins in F-based annotation
     137        books = Book.objects.annotate(oldest=Max(F('authors__age')))
     138        books = books.values_list('rating', 'oldest').order_by('rating', 'oldest')
     139        self.assertEqual(
     140            list(books),
     141            [(3.0, 45), (4.0, 29), (4.0, 37), (4.0, 57), (4.5, 35), (5.0, 57)]
     142        )
     143
     144        publishers = Publisher.objects.annotate(avg_rating=Avg(F('book__rating') - 0))
     145        publishers = publishers.values_list('id', 'avg_rating').order_by('id')
     146        self.assertEqual(list(publishers), [(1, 4.25), (2, 3.0), (3, 4.0), (4, 5.0), (5, None)])
     147
    87148    def test_annotate_m2m(self):
    88149        books = Book.objects.filter(rating__lt=4.5).annotate(Avg("authors__age")).order_by("name")
    89150        self.assertQuerysetEqual(
    class BaseAggregateTestCase(TestCase): 
    108169            ],
    109170            lambda b: (b.name, b.num_authors)
    110171        )
     172       
     173        def raises_exception():
     174            list(Book.objects.annotate(num_authors=Count("authors")).annotate(num_authors2=Count("authors", only=Q(num_authors__gt=1))).order_by("name"))
     175
     176        self.assertRaises(FieldError, raises_exception)
    111177
    112178    def test_backwards_m2m_annotate(self):
    113179        authors = Author.objects.filter(name__contains="a").annotate(Avg("book__rating")).order_by("name")
    class BaseAggregateTestCase(TestCase): 
    194260                }
    195261            ]
    196262        )
     263        books = Book.objects.filter(pk=1).annotate(mean_age=Avg('authors__age', only=Q(authors__age__lt=35))).values('pk', 'isbn', 'mean_age')
     264        self.assertEqual(
     265            list(books), [
     266                {
     267                    "pk": 1,
     268                    "isbn": "159059725",
     269                    "mean_age": 34.0,
     270                }
     271            ]
     272        )
    197273
    198274        books = Book.objects.filter(pk=1).annotate(mean_age=Avg("authors__age")).values("name")
    199275        self.assertEqual(
    class BaseAggregateTestCase(TestCase): 
    271347
    272348        vals = Book.objects.aggregate(Count("rating", distinct=True))
    273349        self.assertEqual(vals, {"rating__count": 4})
     350        vals = Book.objects.aggregate(
     351            low_count=Count("rating", only=Q(rating__lt=4)),
     352            high_count=Count("rating", only=Q(rating__gte=4))
     353        )
     354        self.assertEqual(vals, {"low_count": 1, 'high_count': 5})
     355        vals = Book.objects.aggregate(
     356            low_count=Count("rating", distinct=True, only=Q(rating__lt=4)),
     357            high_count=Count("rating", distinct=True, only=Q(rating__gte=4))
     358        )
     359        self.assertEqual(vals, {"low_count": 1, 'high_count': 3})
    274360
    275361    def test_fkey_aggregate(self):
    276362        explicit = list(Author.objects.annotate(Count('book__id')))
    class BaseAggregateTestCase(TestCase): 
    390476            ],
    391477            lambda p: p.name,
    392478        )
     479        publishers = Publisher.objects.annotate(num_books=Count("book__id", only=Q(book__id__gt=5))).filter(num_books__gt=1, book__price__lt=Decimal("40.0")).order_by("pk")
     480        self.assertQuerysetEqual(
     481            publishers, [
     482                "Expensive Publisher",
     483            ],
     484            lambda p: p.name,
     485        )
    393486
    394487        publishers = Publisher.objects.filter(book__price__lt=Decimal("40.0")).annotate(num_books=Count("book__id")).filter(num_books__gt=1).order_by("pk")
    395488        self.assertQuerysetEqual(
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