Add bigint primary key support for MySQL.

Example:

    create_table :foos, id: :bigint do |t|
    end

3 files changed, 14 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
index 11893684cf..896691d249 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
@@ -65,6 +65,7 @@ module ActiveRecord
             column_options[:column] = o
             column_options[:first] = o.first
             column_options[:after] = o.after
+            column_options[:auto_increment] = o.auto_increment
             column_options[:primary_key] = o.primary_key
             column_options
           end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index cd52ce98c7..26a536be87 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -15,7 +15,7 @@ module ActiveRecord
     # are typically created by methods in TableDefinition, and added to the
     # +columns+ attribute of said TableDefinition object, in order to be used
     # for generating a number of table creation or table changing SQL statements.
-    class ColumnDefinition < Struct.new(:name, :type, :limit, :precision, :scale, :default, :null, :first, :after, :primary_key, :sql_type, :cast_type) #:nodoc:
+    class ColumnDefinition < Struct.new(:name, :type, :limit, :precision, :scale, :default, :null, :first, :after, :auto_increment, :primary_key, :sql_type, :cast_type) #:nodoc:
 
       def primary_key?
         primary_key || type.to_sym == :primary_key
@@ -413,6 +413,7 @@ module ActiveRecord
         column.null        = options[:null]
         column.first       = options[:first]
         column.after       = options[:after]
+        column.auto_increment = options[:auto_increment]
         column.primary_key = type == :primary_key || options[:primary_key]
         column
       end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index ced80bacc8..a3c124bae6 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -6,6 +6,13 @@ module ActiveRecord
     class AbstractMysqlAdapter < AbstractAdapter
       include Savepoints
 
+      class TableDefinition < ActiveRecord::ConnectionAdapters::TableDefinition
+        def primary_key(name, type = :primary_key, options = {})
+          options[:auto_increment] ||= type == :bigint
+          super
+        end
+      end
+
       class SchemaCreation < AbstractAdapter::SchemaCreation
         def visit_AddColumn(o)
           add_column_position!(super, column_options(o))
@@ -859,6 +866,10 @@ module ActiveRecord
         end
       end
 
+      def create_table_definition(name, temporary, options, as = nil) # :nodoc:
+        TableDefinition.new(native_database_types, name, temporary, options, as)
+      end
+
       class MysqlString < Type::String # :nodoc:
         def type_cast_for_database(value)
           case value