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-rw-r--r--rubocop/cop/migration/add_index.rb46
-rw-r--r--rubocop/cop/migration/column_with_default.rb50
-rw-r--r--rubocop/migration_helpers.rb10
-rw-r--r--rubocop/rubocop.rb3
4 files changed, 109 insertions, 0 deletions
diff --git a/rubocop/cop/migration/add_index.rb b/rubocop/cop/migration/add_index.rb
new file mode 100644
index 00000000000..d9247a1f7ea
--- /dev/null
+++ b/rubocop/cop/migration/add_index.rb
@@ -0,0 +1,46 @@
+module RuboCop
+ module Cop
+ module Migration
+ # Cop that checks if indexes are added in a concurrent manner.
+ class AddIndex < RuboCop::Cop::Cop
+ include MigrationHelpers
+
+ MSG = 'add_index requires downtime, use add_concurrent_index instead'
+
+ def on_def(node)
+ return unless in_migration?(node)
+
+ new_tables = []
+
+ node.each_descendant(:send) do |send_node|
+ first_arg = first_argument(send_node)
+
+ # The first argument of "create_table" / "add_index" is the table
+ # name.
+ new_tables << first_arg if create_table?(send_node)
+
+ next if method_name(send_node) != :add_index
+
+ # Using "add_index" is fine for newly created tables as there's no
+ # data in these tables yet.
+ next if new_tables.include?(first_arg)
+
+ add_offense(send_node, :selector)
+ end
+ end
+
+ def create_table?(node)
+ method_name(node) == :create_table
+ end
+
+ def method_name(node)
+ node.children[1]
+ end
+
+ def first_argument(node)
+ node.children[2] ? node.children[0] : nil
+ end
+ end
+ end
+ end
+end
diff --git a/rubocop/cop/migration/column_with_default.rb b/rubocop/cop/migration/column_with_default.rb
new file mode 100644
index 00000000000..97ee8b11044
--- /dev/null
+++ b/rubocop/cop/migration/column_with_default.rb
@@ -0,0 +1,50 @@
+module RuboCop
+ module Cop
+ module Migration
+ # Cop that checks if columns are added in a way that doesn't require
+ # downtime.
+ class ColumnWithDefault < RuboCop::Cop::Cop
+ include MigrationHelpers
+
+ WHITELISTED_TABLES = [:application_settings]
+
+ MSG = 'add_column with a default value requires downtime, ' \
+ 'use add_column_with_default instead'
+
+ def on_send(node)
+ return unless in_migration?(node)
+
+ name = node.children[1]
+
+ return unless name == :add_column
+
+ # Ignore whitelisted tables.
+ return if table_whitelisted?(node.children[2])
+
+ opts = node.children.last
+
+ return unless opts && opts.type == :hash
+
+ opts.each_node(:pair) do |pair|
+ if hash_key_type(pair) == :sym && hash_key_name(pair) == :default
+ add_offense(node, :selector)
+ end
+ end
+ end
+
+ def table_whitelisted?(symbol)
+ symbol && symbol.type == :sym &&
+ WHITELISTED_TABLES.include?(symbol.children[0])
+ end
+
+ def hash_key_type(pair)
+ pair.children[0].type
+ end
+
+ def hash_key_name(pair)
+ pair.children[0].children[0]
+ end
+ end
+ end
+ end
+end
diff --git a/rubocop/migration_helpers.rb b/rubocop/migration_helpers.rb
new file mode 100644
index 00000000000..3160a784a04
--- /dev/null
+++ b/rubocop/migration_helpers.rb
@@ -0,0 +1,10 @@
+module RuboCop
+ # Module containing helper methods for writing migration cops.
+ module MigrationHelpers
+ # Returns true if the given node originated from the db/migrate directory.
+ def in_migration?(node)
+ File.dirname(node.location.expression.source_buffer.name).
+ end_with?('db/migrate')
+ end
+ end
+end
diff --git a/rubocop/rubocop.rb b/rubocop/rubocop.rb
new file mode 100644
index 00000000000..7922e19768b
--- /dev/null
+++ b/rubocop/rubocop.rb
@@ -0,0 +1,3 @@
+require_relative 'migration_helpers'
+require_relative 'cop/migration/add_index'
+require_relative 'cop/migration/column_with_default'