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17-Sep-2018 20:01

An example of such a relationship is a user with many roles, where the roles are also shared by other users.

For example, many users may have the role of "Admin".

To do so, you may pass the name of the relationship to the When accessing the records for a model, you may wish to limit your results based on the absence of a relationship.

For example, imagine you want to retrieve all blog posts that don't have any comments.

For example, imagine users of your application can "comment" both posts and videos.

Using polymorphic relationships, you can use a single instance, depending on which type of model owns the comment.

In addition, all types of Eloquent relationships also serve as query builders, allowing you to continue to chain constraints onto the relationship query before finally executing the SQL against your database.

For example, imagine you want to retrieve all blog posts that have at least one comment.To define this relationship, three database tables are needed: As mentioned previously, to determine the table name of the relationship's joining table, Eloquent will join the two related model names in alphabetical order. You may do so by passing a second argument to the method, all of the usual table and key customization options are available when defining the inverse of many-to-many relationships.As you have already learned, working with many-to-many relations requires the presence of an intermediate table.Eloquent provides some very helpful ways of interacting with this table. However, you are free to customize the name of this attribute to better reflect its purpose within your application.

For example, if your application contains users that may subscribe to podcasts, you probably have a many-to-many relationship between users and podcasts.

However, you may wish to decouple your database from your application's internal structure.



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