12/16/2023 0 Comments Eloquent model using relationMySQL was running on RDS, and this image was took from AWS CloudWatch.īelow, you can see the methods this package implements and also the Laravel equivalent. A relationship means that you have two or more tables with records that are related to each other. That said, below you can see one example of the MySQL CPU usage after deploying a change to use hasUsingJoins instead of has, in one of our client's application. Eloquent determines the default foreign key name by examining the name of the relationship method and suffixing the method name with id. You shouldn't assume this is true for every query, and you should use tools like Laravel Debugbar, Laravel Telescope or any tool of your choice to figure out what's best for YOUR use-case. In the example above, Eloquent will try to match the userid from the Phone model to an id on the User model. Performanceįirst thing to be aware here, is that the below example is one use-case where using joins over where exists is a lot more performant. This package also implements almost all Laravel methods for querying relationship existence using joins instead of where exists. All Eloquent models extend Illuminate\Database\Eloquent\Model class. Models typically live in the app directory, but you are free to place them anywhere that can be auto-loaded according to your composer.json file. However, if the foreign key on the Phone model is not userid, you may pass a custom key name as the second argument to the belongsTo method: Get the user that owns the phone. To get started, let's create an Eloquent model. I am thinking of using Model Relation one-to-many, but the foreign key cannot be static. However, it uses the where exists syntax which is not always the best and more performant choice, depending on how many records you have or the structure of your table. Eloquent determines the default foreign key name by examining the name of the relationship method and suffixing the method name with id. I want to count how many record from table Code 2 are exist in table Code 1 column 34222X234X4422, 34222X234X4423, 34222X234X4424 depend on Code2.cid using Eloquent Laravel withCount. Querying relationship existence is a very powerful and convenient feature of Eloquent.
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