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scope_chain should not be mutated for other reflections

Currently `scope_chain` uses same array for building different
`scope_chain` for different associations. During processing
these arrays are sometimes mutated and because of in-place
mutation the changed `scope_chain` impacts other reflections.

Fix is to dup the value before adding to the `scope_chain`.

Fixes #3882.
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1 parent 25649c7 commit cd9592959f9f16b228ac3f4bc6fc92932253f8dc Neeraj Singh committed May 9, 2013
@@ -1,3 +1,16 @@
+* `scope_chain` should not be mutated for other reflections.
+
+ Currently `scope_chain` uses same array for building different
+ `scope_chain` for different associations. During processing
+ these arrays are sometimes mutated and because of in-place
+ mutation the changed `scope_chain` impacts other reflections.
+
+ Fix is to dup the value before adding to the `scope_chain`.
+
+ Fixes #3882.
+
+ *Neeraj Singh*
+
* Prevent the inversed association from being reloaded on save.
Fixes #9499.
@@ -574,7 +574,7 @@ def scope_chain
# Add to it the scope from this reflection (if any)
scope_chain.first << scope if scope
- through_scope_chain = through_reflection.scope_chain
+ through_scope_chain = through_reflection.scope_chain.map(&:dup)
if options[:source_type]
through_scope_chain.first <<
@@ -18,6 +18,11 @@
require 'models/tag'
require 'models/sponsor'
require 'models/edge'
+require 'models/hotel'
+require 'models/chef'
+require 'models/department'
+require 'models/cake_designer'
+require 'models/drink_designer'
class ReflectionTest < ActiveRecord::TestCase
include ActiveRecord::Reflection
@@ -227,6 +232,17 @@ def test_scope_chain
assert_equal expected, actual
end
+ def test_scope_chain_does_not_interfere_with_hmt_with_polymorphic_case
+ @hotel = Hotel.create!
+ @department = @hotel.departments.create!
+ @department.chefs.create!(employable: CakeDesigner.create!)
+ @department.chefs.create!(employable: DrinkDesigner.create!)
+
+ assert_equal 1, @hotel.cake_designers.size
+ assert_equal 1, @hotel.drink_designers.size
+ assert_equal 2, @hotel.chefs.size
+ end
+
def test_nested?
assert !Author.reflect_on_association(:comments).nested?
assert Author.reflect_on_association(:tags).nested?
@@ -0,0 +1,3 @@
+class CakeDesigner < ActiveRecord::Base
+ has_one :chef, as: :employable
+end
@@ -0,0 +1,3 @@
+class Chef < ActiveRecord::Base
+ belongs_to :employable, polymorphic: true
+end
@@ -0,0 +1,4 @@
+class Department < ActiveRecord::Base
+ has_many :chefs
+ belongs_to :hotel
+end
@@ -0,0 +1,3 @@
+class DrinkDesigner < ActiveRecord::Base
+ has_one :chef, as: :employable
+end
@@ -0,0 +1,6 @@
+class Hotel < ActiveRecord::Base
+ has_many :departments
+ has_many :chefs, through: :departments
+ has_many :cake_designers, source_type: 'CakeDesigner', source: :employable, through: :chefs
+ has_many :drink_designers, source_type: 'DrinkDesigner', source: :employable, through: :chefs
+end
@@ -787,6 +787,22 @@ def create_table(*args, &block)
t.string 'from'
end
+ create_table :hotels, force: true do |t|
+ end
+ create_table :departments, force: true do |t|
+ t.integer :hotel_id
+ end
+ create_table :cake_designers, force: true do |t|
+ end
+ create_table :drink_designers, force: true do |t|
+ end
+ create_table :chefs, force: true do |t|
+ t.integer :employable_id
+ t.string :employable_type
+ t.integer :department_id
+ end
+
+
except 'SQLite' do
# fk_test_has_fk should be before fk_test_has_pk
create_table :fk_test_has_fk, :force => true do |t|

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