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体验新版 GitCode,发现更多精彩内容 >>
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1a20683f
编写于
4月 11, 2012
作者:
J
Juanjo Bazán
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差异文件
Override AR::Relation methods in NullRelation.
So a NullRelation (Relation#none) is chainable with database methods.
上级
b79b784f
变更
2
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并排
Showing
2 changed file
with
86 addition
and
0 deletion
+86
-0
activerecord/lib/active_record/null_relation.rb
activerecord/lib/active_record/null_relation.rb
+53
-0
activerecord/test/cases/relations_test.rb
activerecord/test/cases/relations_test.rb
+33
-0
未找到文件。
activerecord/lib/active_record/null_relation.rb
浏览文件 @
1a20683f
...
...
@@ -6,5 +6,58 @@ class NullRelation < Relation
def
exec_queries
@records
=
[]
end
def
pluck
(
column_name
)
[]
end
def
delete_all
(
conditions
=
nil
)
0
end
def
update_all
(
updates
,
conditions
=
nil
,
options
=
{})
0
end
def
delete
(
id_or_array
)
0
end
def
size
0
end
def
empty?
true
end
def
any?
false
end
def
many?
false
end
def
to_sql
@to_sql
||=
""
end
def
where_values_hash
{}
end
def
count
0
end
def
calculate
(
operation
,
column_name
,
options
=
{})
nil
end
def
exists?
(
id
=
false
)
false
end
end
end
\ No newline at end of file
activerecord/test/cases/relations_test.rb
浏览文件 @
1a20683f
...
...
@@ -219,6 +219,7 @@ def test_none
assert_no_queries
do
assert_equal
[],
Developer
.
none
assert_equal
[],
Developer
.
scoped
.
none
assert
Developer
.
none
.
is_a?
(
ActiveRecord
::
NullRelation
)
end
end
...
...
@@ -228,6 +229,38 @@ def test_none_chainable
end
end
def
test_none_chained_to_methods_firing_queries_straight_to_db
assert_no_queries
do
assert_equal
[],
Developer
.
none
.
pluck
(
:id
)
# => uses select_all
assert_equal
0
,
Developer
.
none
.
delete_all
assert_equal
0
,
Developer
.
none
.
update_all
(
:name
=>
'David'
)
assert_equal
0
,
Developer
.
none
.
delete
(
1
)
assert_equal
false
,
Developer
.
none
.
exists?
(
1
)
end
end
def
test_null_relation_content_size_methods
assert_no_queries
do
assert_equal
0
,
Developer
.
none
.
size
assert_equal
0
,
Developer
.
none
.
count
assert_equal
true
,
Developer
.
none
.
empty?
assert_equal
false
,
Developer
.
none
.
any?
assert_equal
false
,
Developer
.
none
.
many?
end
end
def
test_null_relation_calculations_methods
assert_no_queries
do
assert_equal
0
,
Developer
.
none
.
count
assert_equal
nil
,
Developer
.
none
.
calculate
(
:average
,
'salary'
)
end
end
def
test_null_relation_metadata_methods
assert_equal
""
,
Developer
.
none
.
to_sql
assert_equal
({},
Developer
.
none
.
where_values_hash
)
end
def
test_joins_with_nil_argument
assert_nothing_raised
{
DependentFirm
.
joins
(
nil
).
first
}
end
...
...
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