diff options
Diffstat (limited to 'lib/active_relation/relations/join.rb')
| -rw-r--r-- | lib/active_relation/relations/join.rb | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/active_relation/relations/join.rb b/lib/active_relation/relations/join.rb new file mode 100644 index 0000000000..1bd1439dd6 --- /dev/null +++ b/lib/active_relation/relations/join.rb @@ -0,0 +1,45 @@ +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
\ No newline at end of file |