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remove deprecation warning when modifying a Relation with cached arel.

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senny committed Jan 5, 2015
1 parent 65520c2 commit 3ae98181433dda1b5e19910e107494762512a86c
@@ -1,3 +1,8 @@
* Remove deprecation when modifying a relation with cached arel.
This raises an `ImmutableRelation` error instead.

*Yves Senn*

* Added `ActiveRecord::SecureToken` in order to encapsulate generation of
unique tokens for attributes in a model using `SecureRandom`.

@@ -62,15 +62,14 @@ def not(opts, *rest)

Relation::MULTI_VALUE_METHODS.each do |name|
class_eval <<-CODE, __FILE__, __LINE__ + 1
def #{name}_values # def select_values
@values[:#{name}] || [] # @values[:select] || []
end # end
#
def #{name}_values=(values) # def select_values=(values)
raise ImmutableRelation if @loaded # raise ImmutableRelation if @loaded
check_cached_relation
@values[:#{name}] = values # @values[:select] = values
end # end
def #{name}_values # def select_values
@values[:#{name}] || [] # @values[:select] || []
end # end
#
def #{name}_values=(values) # def select_values=(values)
assert_mutability! # assert_mutability!
@values[:#{name}] = values # @values[:select] = values
end # end
CODE
end

@@ -85,23 +84,12 @@ def #{name}_value # def readonly_value
Relation::SINGLE_VALUE_METHODS.each do |name|
class_eval <<-CODE, __FILE__, __LINE__ + 1
def #{name}_value=(value) # def readonly_value=(value)
raise ImmutableRelation if @loaded # raise ImmutableRelation if @loaded
check_cached_relation
assert_mutability! # assert_mutability!
@values[:#{name}] = value # @values[:readonly] = value
end # end
CODE
end

def check_cached_relation # :nodoc:
if defined?(@arel) && @arel
@arel = nil
ActiveSupport::Deprecation.warn(<<-MSG.squish)
Modifying already cached Relation. The cache will be reset. Use a
cloned Relation to prevent this warning.
MSG
end
end

def create_with_value # :nodoc:
@values[:create_with] || {}
end
@@ -857,6 +845,11 @@ def arel # :nodoc:

private

def assert_mutability!
raise ImmutableRelation if @loaded
raise ImmutableRelation if defined?(@arel) && @arel
end

def build_arel
arel = Arel::SelectManager.new(table)

@@ -1651,6 +1651,14 @@ def test_presence
end
end

test "relations with cached arel can't be mutated [internal API]" do
relation = Post.all
relation.count

assert_raises(ActiveRecord::ImmutableRelation) { relation.limit!(5) }
assert_raises(ActiveRecord::ImmutableRelation) { relation.where!("1 = 2") }
end

test "relations show the records in #inspect" do
relation = Post.limit(2)
assert_equal "#<ActiveRecord::Relation [#{Post.limit(2).map(&:inspect).join(', ')}]>", relation.inspect

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