Deprecate remove_column with array as an argument

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -269,6 +269,12 @@ module ActiveRecord
       #  remove_column(:suppliers, :qualification)
       #  remove_columns(:suppliers, :qualification, :experience)
       def remove_column(table_name, *column_names)
+        if column_names.first.kind_of?(Enumerable)
+          message = 'Passing array to remove_columns is deprecated, please use ' +
+                    'multiple arguments, like: `remove_columns(:posts, :foo, :bar)`'
+          ActiveSupport::Deprecation.warn message, caller
+        end
+
         columns_for_remove(table_name, *column_names).each {|column_name| execute "ALTER TABLE #{quote_table_name(table_name)} DROP #{column_name}" }
       end
       alias :remove_columns :remove_column

activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb

@@ -407,6 +407,13 @@ module ActiveRecord
 
       def remove_column(table_name, *column_names) #:nodoc:
         raise ArgumentError.new("You must specify at least one column name. Example: remove_column(:people, :first_name)") if column_names.empty?
+
+        if column_names.first.kind_of?(Enumerable)
+          message = 'Passing array to remove_columns is deprecated, please use ' +
+                    'multiple arguments, like: `remove_columns(:posts, :foo, :bar)`'
+          ActiveSupport::Deprecation.warn message, caller
+        end
+
         column_names.flatten.each do |column_name|
           alter_table(table_name) do |definition|
             definition.columns.delete(definition[column_name])

activerecord/test/cases/migration_test.rb

@@ -873,6 +873,12 @@ if ActiveRecord::Base.connection.supports_migrations?
       assert_raise(ArgumentError) { Person.connection.remove_column("funny") }
     end
 
+    def test_remove_column_with_array_as_an_argument_is_deprecated
+      assert_deprecated /Passing array to remove_columns is deprecated/ do
+        Person.connection.remove_column("people", ["last_name", "description"])
+      end
+    end
+
     def test_change_type_of_not_null_column
       assert_nothing_raised do
         Topic.connection.change_column "topics", "written_on", :datetime, :null => false