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module Arel
class Update < Compound
attributes :relation, :assignments
deriving :==
def initialize(relation, assignments)
@relation, @assignments = relation, assignments
end
def to_sql(formatter = nil)
[
"UPDATE #{table_sql} SET",
map_assignments,
("WHERE #{wheres.map(&:to_sql).join('\n\tAND ')}" unless wheres.blank? ),
("LIMIT #{taken}" unless taken.blank? )
].join("\n")
end
def call(connection = engine)
connection.update(to_sql)
end
def map_assignments
assignments.collect do |attribute, value|
attribute.respond_to?(:name) ?
"#{engine.quote_column_name(attribute.name)} = #{attribute.format(value)}" : attribute
end.join(",\n")
end
end
end
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