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module Arel
class UpdateManager < Arel::TreeManager
def initialize engine
super
@head = Nodes::UpdateStatement.new
end
def take limit
@head.limit = limit
self
end
def order *expr
@head.orders = expr
self
end
###
# UPDATE +table+
def table table
@head.relation = table
self
end
def wheres= exprs
@head.wheres = exprs
end
def where expr
@head.wheres << expr
self
end
def set values
if String === values
@head.values = [values]
else
@head.values = values.map { |column,value|
Nodes::Assignment.new(
Nodes::UnqualifiedColumn.new(column),
value
)
}
end
self
end
def to_sql
viz = Visitors::ToSql.new @engine
unless @engine.connection_pool.spec.config[:adapter] =~ /^mysql/
viz.extend(Visitors::UpdateSql)
end
viz.accept @head
end
end
end
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