Remove `Column#primary`

It appears to have been used at some point in the past, but is no longer
used in any meaningful way. Whether a column is considered primary is
a property of the model, not the schema/column. This also removes the
need for yet another layer of caching of the model's schema, and we can
leave that to the schema cache.

1 files changed, 1 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 704868c058..42aabd6d7f 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -14,7 +14,7 @@ module ActiveRecord
       end
 
       attr_reader :name, :default, :cast_type, :null, :sql_type, :default_function
-      attr_accessor :primary, :coder
+      attr_accessor :coder
 
       alias :encoded? :coder
 
@@ -36,7 +36,6 @@ module ActiveRecord
         @null             = null
         @default          = extract_default(default)
         @default_function = nil
-        @primary          = nil
         @coder            = nil
       end