diff options
author | Alexis Reigel <mail@koffeinfrei.org> | 2017-03-09 22:27:14 +0300 |
---|---|---|
committer | Alexis Reigel <mail@koffeinfrei.org> | 2017-04-06 11:01:14 +0300 |
commit | 5ea4e34f4755e9a15503a6f16fd1574dc7864b23 (patch) | |
tree | fb48727932e90207614722ff95f79512c4ae04c3 /app/models/concerns/routable.rb | |
parent | b7ca7330ec9119c6a5eea00df20ddc690d4dafe1 (diff) |
add method to get a full routable hierarchy
Diffstat (limited to 'app/models/concerns/routable.rb')
-rw-r--r-- | app/models/concerns/routable.rb | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/app/models/concerns/routable.rb b/app/models/concerns/routable.rb index 529fb5ce988..9b8970a1f38 100644 --- a/app/models/concerns/routable.rb +++ b/app/models/concerns/routable.rb @@ -83,6 +83,74 @@ module Routable AND members.source_type = r2.source_type"). where('members.user_id = ?', user_id) end + + # Builds a relation to find multiple objects that are nested under user + # membership. Includes the parent, as opposed to `#member_descendants` + # which only includes the descendants. + # + # Usage: + # + # Klass.member_self_and_descendants(1) + # + # Returns an ActiveRecord::Relation. + def member_self_and_descendants(user_id) + joins(:route). + joins("INNER JOIN routes r2 ON routes.path LIKE CONCAT(r2.path, '/%') + OR routes.path = r2.path + INNER JOIN members ON members.source_id = r2.source_id + AND members.source_type = r2.source_type"). + where('members.user_id = ?', user_id) + end + + # Returns all objects in a hierarchy, where any node in the hierarchy is + # under the user membership. + # + # Usage: + # + # Klass.member_hierarchy(1) + # + # Examples: + # + # Given the following group tree... + # + # _______group_1_______ + # | | + # | | + # nested_group_1 nested_group_2 + # | | + # | | + # nested_group_1_1 nested_group_2_1 + # + # + # ... the following results are returned: + # + # * the user is a member of group 1 + # => 'group_1', + # 'nested_group_1', nested_group_1_1', + # 'nested_group_2', 'nested_group_2_1' + # + # * the user is a member of nested_group_2 + # => 'group1', + # 'nested_group_2', 'nested_group_2_1' + # + # * the user is a member of nested_group_2_1 + # => 'group1', + # 'nested_group_2', 'nested_group_2_1' + # + # Returns an ActiveRecord::Relation. + def member_hierarchy(user_id) + paths = member_self_and_descendants(user_id).pluck('routes.path') + + return none if paths.empty? + + leaf_paths = paths.group_by(&:length).flat_map(&:last) + + wheres = leaf_paths.map do |leaf_path| + "#{connection.quote(leaf_path)} LIKE CONCAT(routes.path, '%')" + end + + joins(:route).where(wheres.join(' OR ')) + end end def full_name |