How are one to many relationships defined in Laravel?
A one-to-many relationship is used to define relationships where a single model is the parent to one or more child models. For example, a blog post may have an infinite number of comments. Like all other Eloquent relationships, one-to-many relationships are defined by defining a method on your Eloquent model:
How to filter out incomplete relation in Laravel?
In Laravel 4.2 I have a model called Product with many-to-many relationshis to other models like Country or Category. I want to filter out products that are “incomplete”, which means they have no connected countries or no connected categories. I can use whereDoesntHave () method to filter out one relation.
When to use the doesnthave operator in Laravel?
You can use doesntHave and specify the boolean operator: Actually you only need whereDoesntHave if you want to pass in a closure to filter the related models before checking if any of them exist. In case you want to do that you can pass the closure as third argument:
When to use eloquent foreign key Conventions in Laravel?
The first argument passed to the hasOneThrough method is the name of the final model we wish to access, while the second argument is the name of the intermediate model. Typical Eloquent foreign key conventions will be used when performing the relationship’s queries.
Which is better MySQL 5 or 8 for Laravel?
The benchmark between MySQL 5 and 8 which MySQL 8 give huge difference in the time it takes to process transactions and improvement in high workload. For Laravel, there is also different in performance between L7 and L8 which based on my test is 2x faster than L7 and 4x faster than L6.
How to speed up database query in Laravel?
Because, the query actually runs once to get all the users BUT for each loop, its query another query for devices for 100 times. So, here is 100 + 1 = N+1 problem. Imagine if you want to fetch thousand of data. If one query cost 100ms * 100 = 10,000ms it takes to complete process. Mistake 2: Wrong Manipulation relation table using append attribute.