new files?

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/active_relation/relations/join.rb b/lib/active_relation/relations/join.rb
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index 0000000000..1bd1439dd6
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+++ b/lib/active_relation/relations/join.rb
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+module ActiveRelation
+  module Relations
+    class Join < Base
+      attr_reader :join_sql, :relation1, :relation2, :predicates
+  
+      def initialize(join_sql, relation1, relation2, *predicates)
+        @join_sql, @relation1, @relation2, @predicates = join_sql, relation1, relation2, predicates
+      end
+  
+      def ==(other)
+        predicates == other.predicates and
+          ((relation1 == other.relation1 and relation2 == other.relation2) or
+          (relation2 == other.relation1 and relation1 == other.relation2))
+      end
+
+      def qualify
+        Join.new(join_sql, relation1.qualify, relation2.qualify, *predicates.collect(&:qualify))
+      end
+  
+      protected
+      def joins
+        [relation1.joins, relation2.joins, join].compact.join(" ")
+      end
+  
+      def selects
+        relation1.send(:selects) + relation2.send(:selects)
+      end
+  
+      def attributes
+        relation1.attributes + relation2.attributes
+      end
+  
+      def attribute(name)
+        relation1[name] || relation2[name]
+      end
+  
+      delegate :table, :to => :relation1
+  
+      private
+      def join
+        "#{join_sql} #{quote_table_name(relation2.table)} ON #{predicates.collect { |p| p.to_sql(:quote => false) }.join(' AND ')}"
+      end
+    end
+  end
+end
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