Web定义关联. Eloquent 关联在 Eloquent 模型类中以方法的形式呈现。如同 Eloquent 模型本身，关联也可以作为强大的查询语句构造器，使用，提 WebLaravel 学院致力于提供优质 PHP 全栈编程技术学习资源
Laravel important methods: firstOrNew, firstOrCreate, firstOr, and ...
WebLaravel の firstOrNew () firstOrCreate () updateOrCreate () 等はレースコンディションが全く考慮されていない 普通はユニークキー制約エラーを拾ってリトライするだけで十分 updateOrCreate () 相当の処理で厳格にロストアップデートを回避する場合，悲観ロックまたは楽観ロックのいずれかの適用が必要。 Laravel 8.10 以降は upsert () という選択肢 … WebDescription: updateOrCreate () excludes key attributes on insertion. function internally. The problem is function uses newModelInstance () to get new Model instance. In this way, attribute which is not allowed by $fillable property would not be assigned to the model. (like st_id on my code below) simplify fpga
firstOrCreate, firstOrNew, updateOrCreate methods use
The firstOrCreate method is very similar to the firstOrNew method. It tries to find a model matching the attributes you pass in the first parameter. If a model is not found, it automatically creates and savesa new Model after applying any attributes passed in the second parameter: See more The firstOrNewmethod is really useful for finding the first Model that matches some constraints or making a new one if there isn’t one that matches those constraints. You can take a piece of code that looks like this: And turn it … See more I recently found the firstOr method while source-diving. The firstOrmethod retrieves the first Model from a query, or if no matching Model is … See more Overall, I think these methods can help clean up your code in certain circumstances and are great options to have in your tool … See more The updateOrCreatemethod attempts to find a Model matching the constraints passed as the first parameter. If a matching Model is found, it will update the match with the attributes passed as the second parameter. If … See more WebJul 13, 2024 · It is similar to firstOrNew () but the difference is that: firstOrNew (): As discussed above, it will save your Model if the Model does not exist but it gives you a Model instance and you need to call the save () function. firstOrCreate (): In this method, you don’t need to call save () function. raymond\u0027s clinic