WildcardScopes¶ ↑

Use ActiveRecord scopes with dynamic names.

Example¶ ↑

# config/initializers/wildcard_scopes.rb
# Global scopes. Wildcard scope should be wrapped in a proc. a is array of matches.
ActiveRecord::Base.wildcard_scope /descend_by_(.*)/, proc { |a| order("#{table_name}.#{a.first} DESC") }

# app/models/user.rb
class User < ActiveRecord::Base
  wildcard_scope /ascend_by_(.*)/, proc { |a| order("#{table_name}.#{a.first} ASC") }
end

User.ascend_by_name.to_sql     # SELECT "users".* FROM "users"  ORDER BY users.name ASC
User.ascend_by_position.to_sql # SELECT "users".* FROM "users"  ORDER BY users.position ASC
User.descend_by_name.to_sql    # SELECT "users".* FROM "users"  ORDER BY users.name DESC

Notes¶ ↑

1. This gem is created to simplify migration from SearchLogic to Ransack.

2. Use of global scopes is not a good idea at all.

3. Association extensions are not yet allowed.

4. Tested with Rails 3.1, Ruby 1.8.7 and 1.9.3.