Handle aliased attributes in ActiveRecord::Relation.

When using symbol keys, ActiveRecord will now translate aliased attribute names to the actual column name used in the database:

With the model

  class Topic
    alias_attribute :heading, :title
  end

The call

  Topic.where(heading: 'The First Topic')

should yield the same result as

  Topic.where(title: 'The First Topic')

This also applies to ActiveRecord::Relation::Calculations calls such as `Model.sum(:aliased)` and `Model.pluck(:aliased)`.

This will not work with SQL fragment strings like `Model.sum('DISTINCT aliased')`.

Github #7839

*Godfrey Chan*

1 files changed, 2 insertions, 1 deletions

diff --git a/activerecord/test/cases/finder_test.rb b/activerecord/test/cases/finder_test.rb
index 557cc7e7a0..7db9aef218 100644
--- a/activerecord/test/cases/finder_test.rb
+++ b/activerecord/test/cases/finder_test.rb
@@ -47,7 +47,8 @@ class FinderTest < ActiveRecord::TestCase
   def test_exists
     assert Topic.exists?(1)
     assert Topic.exists?("1")
-    assert Topic.exists?(:author_name => "David")
+    assert Topic.exists?(title: "The First Topic")
+    assert Topic.exists?(heading: "The First Topic")
     assert Topic.exists?(:author_name => "Mary", :approved => true)
     assert Topic.exists?(["parent_id = ?", 1])
     assert !Topic.exists?(45)