Use string constants in Mongoid::Context

lib/ransack/adapters/active_record/ransack/constants.rb

@@ -1,10 +1,6 @@
 module Ransack
   module Constants
-    DISTINCT            = 'DISTINCT '.freeze
-    STRING_JOIN         = 'string_join'.freeze
-    ASSOCIATION_JOIN    = 'association_join'.freeze
-    STASHED_JOIN        = 'stashed_join'.freeze
-    JOIN_NODE           = 'join_node'.freeze
+    DISTINCT = 'DISTINCT '.freeze
 
     DERIVED_PREDICATES = [
       ['cont'.freeze, {

lib/ransack/adapters/mongoid/context.rb

@@ -145,27 +145,31 @@ module Ransack
           buckets = relation.joins_values.group_by do |join|
             case join
             when String
-              'string_join'
+              Ransack::Constants::STRING_JOIN
             when Hash, Symbol, Array
-              'association_join'
+              Ransack::Constants::ASSOCIATION_JOIN
             when JoinDependency, JoinDependency::JoinAssociation
-              'stashed_join'
+              Ransack::Constants::STASHED_JOIN
             when Arel::Nodes::Join
-              'join_node'
+              Ransack::Constants::JOIN_NODE
             else
               raise 'unknown class: %s' % join.class.name
             end
           end
 
-          association_joins         = buckets['association_join'] || []
+          association_joins =
+            buckets[Ransack::Constants::ASSOCIATION_JOIN] || []
 
-          stashed_association_joins = buckets['stashed_join'] || []
+          stashed_association_joins =
+            buckets[Ransack::Constants::STASHED_JOIN] || []
 
-          join_nodes                = buckets['join_node'] || []
+          join_nodes =
+            buckets[Ransack::Constants::JOIN_NODE] || []
 
-          string_joins              = (buckets['string_join'] || [])
-                                      .map { |x| x.strip }
-                                      .uniq
+          string_joins =
+            (buckets[Ransack::Constants::STRING_JOIN] || [])
+            .map { |x| x.strip }
+            .uniq
 
           join_list = relation.send :custom_join_ast,
             relation.table.from(relation.table), string_joins

lib/ransack/constants.rb

@@ -18,6 +18,11 @@ module Ransack
     NON_BREAKING_SPACE  = ' '.freeze
     EMPTY               = ''.freeze
 
+    STRING_JOIN         = 'string_join'.freeze
+    ASSOCIATION_JOIN    = 'association_join'.freeze
+    STASHED_JOIN        = 'stashed_join'.freeze
+    JOIN_NODE           = 'join_node'.freeze
+
     TRUE_VALUES = [true, 1, '1', 't', 'T', 'true', 'TRUE'].to_set
     FALSE_VALUES = [false, 0, '0', 'f', 'F', 'false', 'FALSE'].to_set
     BOOLEAN_VALUES = TRUE_VALUES + FALSE_VALUES