Rails-最佳实践：如何创建依赖的has_one关系

作者: 狗头军师
发布时间: 2024-04-15 09:11:15 (1天前)

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v-star*위위 | 2020-08-20 16-08

创建has_one关系的最佳实践是使用ActiveRecord回调before_create而不是after_create。或者使用更早的回调并处理子代未通过其自己的验证步骤的问题（如果有）。因为：通过良好的编码，如果验证失败，则您有机会将子记录的验证显示给用户它更干净，并由ActiveRecord明确支持-AR在保存父记录（创建时）后自动在子记录中填充外键。然后，AR将子记录保存为创建父记录的一部分。怎么做： ``` # in your User model... has_one :profile before_create :build_default_profile private def build_default_profile # build default profile instance. Will use default params. # The foreign key to the owning User model is set automatically build_profile true # Always return true in callbacks as the normal 'continue' state # Assumes that the default_profile can **always** be created. # or # Check the validation of the profile. If it is not valid, then # return false from the callback. Best to use a before_validation # if doing this. View code should check the errors of the child. # Or add the child's errors to the User model's error array of the :base # error item end ```

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