1 files changed, 13 insertions, 21 deletions

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 cb83d0022c..158b773e11 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -1,8 +1,3 @@
-require 'date'
-require 'set'
-require 'bigdecimal'
-require 'bigdecimal/util'
-
 module ActiveRecord
   module ConnectionAdapters #:nodoc:
     # Abstract representation of an index definition on a table. Instances of
@@ -15,13 +10,16 @@ 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, :auto_increment, :primary_key, :sql_type) #:nodoc:
+    class ColumnDefinition < Struct.new(:name, :type, :limit, :precision, :scale, :default, :null, :first, :after, :auto_increment, :primary_key, :collation, :sql_type) #:nodoc:
 
       def primary_key?
         primary_key || type.to_sym == :primary_key
       end
     end
 
+    class AddColumnDefinition < Struct.new(:column) # :nodoc:
+    end
+
     class ChangeColumnDefinition < Struct.new(:column, :name) #:nodoc:
     end
 
@@ -227,7 +225,7 @@ module ActiveRecord
       # The +type+ parameter is normally one of the migrations native types,
       # which is one of the following:
       # <tt>:primary_key</tt>, <tt>:string</tt>, <tt>:text</tt>,
-      # <tt>:integer</tt>, <tt>:float</tt>, <tt>:decimal</tt>,
+      # <tt>:integer</tt>, <tt>:bigint</tt>, <tt>:float</tt>, <tt>:decimal</tt>,
       # <tt>:datetime</tt>, <tt>:time</tt>, <tt>:date</tt>,
       # <tt>:binary</tt>, <tt>:boolean</tt>.
       #
@@ -359,6 +357,7 @@ module ActiveRecord
       def column(name, type, options = {})
         name = name.to_s
         type = type.to_sym
+        options = options.dup
 
         if @columns_hash[name] && @columns_hash[name].primary_key?
           raise ArgumentError, "you can't redefine the primary key column '#{name}'. To define a custom primary key, pass { id: false } to create_table."
@@ -399,17 +398,12 @@ module ActiveRecord
         column(:updated_at, :datetime, options)
       end
 
-      # Adds a reference. Optionally adds a +type+ column, if the
-      # +:polymorphic+ option is provided. +references+ and +belongs_to+
-      # are interchangeable. The reference column will be an +integer+ by default,
-      # the +:type+ option can be used to specify a different type. A foreign
-      # key will be created if the +:foreign_key+ option is passed.
+      # Adds a reference.
       #
       #  t.references(:user)
-      #  t.references(:user, type: "string")
-      #  t.belongs_to(:supplier, polymorphic: true)
+      #  t.belongs_to(:supplier, foreign_key: true)
       #
-      # See SchemaStatements#add_reference
+      # See SchemaStatements#add_reference for details of the options you can use.
       def references(*args, **options)
         args.each do |col|
           ReferenceDefinition.new(col, **options).add_to(self)
@@ -433,6 +427,7 @@ module ActiveRecord
         column.after       = options[:after]
         column.auto_increment = options[:auto_increment]
         column.primary_key = type == :primary_key || options[:primary_key]
+        column.collation   = options[:collation]
         column
       end
 
@@ -475,7 +470,7 @@ module ActiveRecord
       def add_column(name, type, options)
         name = name.to_s
         type = type.to_sym
-        @adds << @td.new_column_definition(name, type, options)
+        @adds << AddColumnDefinition.new(@td.new_column_definition(name, type, options))
       end
     end
 
@@ -642,15 +637,12 @@ module ActiveRecord
         @base.rename_column(name, column_name, new_column_name)
       end
 
-      # Adds a reference. Optionally adds a +type+ column, if
-      # <tt>:polymorphic</tt> option is provided.
+      # Adds a reference.
       #
       #  t.references(:user)
-      #  t.references(:user, type: "string")
-      #  t.belongs_to(:supplier, polymorphic: true)
       #  t.belongs_to(:supplier, foreign_key: true)
       #
-      # See SchemaStatements#add_reference
+      # See SchemaStatements#add_reference for details of the options you can use.
       def references(*args)
         options = args.extract_options!
         args.each do |ref_name|