rails5 belongs_to 默认不能为空，报错must exist

编程语言 2018-05-10 11:07:40 阅读次数: 1

1：在config/application.rb设置 config.active_record.belongs_to_required_by_default = false

2： belongs_to 的时候添加optional: true

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转载自zhangcaiyanbeyond.iteye.com/blog/2371728

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