Deprecate `supports_migrations?` on connection adapters

`supports_migrations?` was added at 4160b518 to determine if schema
statements (`create_table`, `drop_table`, etc) are implemented in the
adapter. But all tested databases has been supported migrations since
a4fc93c3 at least.

1 files changed, 10 insertions, 12 deletions

diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index a43c06cd6e..c13a962e3e 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -566,19 +566,17 @@ class DirtyTest < ActiveRecord::TestCase
     travel_back
   end
 
-  if ActiveRecord::Base.connection.supports_migrations?
-    class Testings < ActiveRecord::Base; end
-    def test_field_named_field
-      ActiveRecord::Base.connection.create_table :testings do |t|
-        t.string :field
-      end
-      assert_nothing_raised do
-        Testings.new.attributes
-      end
-    ensure
-      ActiveRecord::Base.connection.drop_table :testings rescue nil
-      ActiveRecord::Base.clear_cache!
+  class Testings < ActiveRecord::Base; end
+  def test_field_named_field
+    ActiveRecord::Base.connection.create_table :testings do |t|
+      t.string :field
     end
+    assert_nothing_raised do
+      Testings.new.attributes
+    end
+  ensure
+    ActiveRecord::Base.connection.drop_table :testings rescue nil
+    ActiveRecord::Base.clear_cache!
   end
 
   def test_datetime_attribute_can_be_updated_with_fractional_seconds