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module Arel
class Update < Writing
attr_reader :assignments
def initialize(relation, assignments)
@relation, @assignments = relation, assignments.bind(relation)
end
def to_sql(formatter = nil)
[
"UPDATE #{table_sql} SET",
assignments.collect do |attribute, value|
"#{value.format(attribute)} = #{attribute.format(value)}"
end.join(",\n"),
("WHERE #{selects.collect(&:to_sql).join('\n\tAND ')}" unless selects.blank? ),
("LIMIT #{taken}" unless taken.blank? )
].join("\n")
end
def call(connection = engine.connection)
connection.update(to_sql)
end
def ==(other)
self.class == other.class and
relation == other.relation and
assignments == other.assignments
end
end
end
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