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module Arel
class Join
def table_sql(formatter = Sql::TableReference.new(self))
relation1.externalize.table_sql(formatter)
end
def joins(environment, formatter = Sql::TableReference.new(environment))
@joins ||= begin
this_join = [
join_sql,
relation2.externalize.table_sql(formatter),
("ON" unless predicates.blank?),
(ons + relation2.externalize.wheres).collect { |p| p.bind(environment).to_sql(Sql::WhereClause.new(environment)) }.join(' AND ')
].compact.join(" ")
[relation1.joins(environment), this_join, relation2.joins(environment)].compact.join(" ")
end
end
end
class InnerJoin < Join
def join_sql; "INNER JOIN" end
end
class OuterJoin < Join
def join_sql; "LEFT OUTER JOIN" end
end
class StringJoin < Join
def joins(environment, formatter = Sql::TableReference.new(environment))
[relation1.joins(environment), relation2].compact.join(" ")
end
end
end
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