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authorYorick Peterse <yorickpeterse@gmail.com>2016-06-24 17:26:28 +0200
committerYorick Peterse <yorickpeterse@gmail.com>2016-06-29 14:14:02 +0200
commitc740445ad3825da4e5f7fea943be561ece982443 (patch)
treec5b99c0d3665c720b6c307e5b0806767f7b7b19d /rubocop/cop
parentd33991f8cc343cef704d04fd7b97c69887f3299b (diff)
downloadgitlab-ce-c740445ad3825da4e5f7fea943be561ece982443.tar.gz
Added RuboCop cops for checking DB migrationsmigration-cops
There are currently two cops for this: * Migration/AddIndex: checks if indexes are added concurrently * Migration/ColumnWithDefault: checks if columns with default values are added in a concurrent manner Both cops are fairly simple and make no attempt at correcting the code as this is quite hard to do (e.g. modifications may need to be applied in various places in the same file). They however should provide enough to catch people ignoring the comments in generated migrations telling them to use add_concurrent_index or add_column_with_default.
Diffstat (limited to 'rubocop/cop')
-rw-r--r--rubocop/cop/migration/add_index.rb46
-rw-r--r--rubocop/cop/migration/column_with_default.rb50
2 files changed, 96 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