Ruby China

Rails 如何判断对象是否存在？

jofone · March 03, 2013 · Last by deathdealer replied at March 03, 2013 · 4263 hits

我有一个公司的模型，其 has_one 营业执照模型，如何判断公司的营业执照是否存在？我这样判断： if @company.biz_licence?

结果出错：undefined method `biz_licence?' for #Company:0x007f2614bbcd08。

windwiny #1 March 03, 2013

defined? aa and defined? aa.bb

rociiu #2 March 03, 2013

if @comany.biz_licence 即可

ericguo #3 March 03, 2013

if @company.biz_licence.present?可能更好？

jofone #4 March 03, 2013

#2 楼 @rociiu 谢谢！这样行了！ #3 楼 @ericguo if @company.biz_licence.present? 也试过了，可行！谢谢！

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