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-rw-r--r--rubocop/cop/migration/remove_column.rb30
-rw-r--r--rubocop/migration_helpers.rb6
-rw-r--r--rubocop/rubocop.rb1
3 files changed, 37 insertions, 0 deletions
diff --git a/rubocop/cop/migration/remove_column.rb b/rubocop/cop/migration/remove_column.rb
new file mode 100644
index 00000000000..e53eb2e07b2
--- /dev/null
+++ b/rubocop/cop/migration/remove_column.rb
@@ -0,0 +1,30 @@
+require_relative '../../migration_helpers'
+
+module RuboCop
+ module Cop
+ module Migration
+ # Cop that checks if remove_column is used in a regular (not
+ # post-deployment) migration.
+ class RemoveColumn < RuboCop::Cop::Cop
+ include MigrationHelpers
+
+ MSG = '`remove_column` must only be used in post-deployment migrations'.freeze
+
+ def on_def(node)
+ def_method = node.children[0]
+
+ return unless in_migration?(node) && !in_post_deployment_migration?(node)
+ return unless def_method == :change || def_method == :up
+
+ node.each_descendant(:send) do |send_node|
+ send_method = send_node.children[1]
+
+ if send_method == :remove_column
+ add_offense(send_node, :selector)
+ end
+ end
+ end
+ end
+ end
+ end
+end
diff --git a/rubocop/migration_helpers.rb b/rubocop/migration_helpers.rb
index c3473771178..c066d424437 100644
--- a/rubocop/migration_helpers.rb
+++ b/rubocop/migration_helpers.rb
@@ -7,5 +7,11 @@ module RuboCop
dirname.end_with?('db/migrate', 'db/post_migrate')
end
+
+ def in_post_deployment_migration?(node)
+ dirname = File.dirname(node.location.expression.source_buffer.name)
+
+ dirname.end_with?('db/post_migrate')
+ end
end
end
diff --git a/rubocop/rubocop.rb b/rubocop/rubocop.rb
index 7621ea50da9..eb52be3d731 100644
--- a/rubocop/rubocop.rb
+++ b/rubocop/rubocop.rb
@@ -14,6 +14,7 @@ require_relative 'cop/migration/add_index'
require_relative 'cop/migration/add_timestamps'
require_relative 'cop/migration/datetime'
require_relative 'cop/migration/hash_index'
+require_relative 'cop/migration/remove_column'
require_relative 'cop/migration/remove_concurrent_index'
require_relative 'cop/migration/remove_index'
require_relative 'cop/migration/reversible_add_column_with_default'