Now, let's imagine we want to retrieve ActivityFeed instances and eager load the parentable parent models for each ActivityFeed instance. Additionally, let's assume that Photo models "have many" Tag models and Post models "have many" Comment models. We will assume the ActivityFeed model defines a "morph to" relationship named parentable that allows us to retrieve the parent Photo or Post model for a given ActivityFeed instance. In this example, let's assume that Photo and Post models may create ActivityFeed models. If you would like to eager load a "morph to" relationship, as well as related model counts for the various entities that may be returned by that relationship, you may utilize the with method in combination with the morphTo relationship's morphWithCount method. We can summarize the relationship's table structure like so:Ĭounting Related Models On Morph To Relationships In order to provide support for roles being assigned to multiple users, the role_user table is needed. This would mean that a role could only belong to a single user. Remember, since a role can belong to many users, we cannot simply place a user_id column on the roles table. This table is used as an intermediate table linking the users and roles. In this article, I will show you a few tricks. The role_user table is derived from the alphabetical order of the related model names and contains user_id and role_id columns. ORM seems like a simple mechanism, but under the hood, there’s a lot of semi-hidden functions and less-known ways to achieve more with it. To define this relationship, three database tables are needed: users, roles, and role_user. The most interesting thing is that the post section comments, favorites and other things are connected to the database using Eloquent. Apart from this, there is a separate crud system for admin and author to provide complete security. Laravel - Eloquent 'Has', 'With', 'WhereHas' - What do they mean 395. Where I used SMTP mail api starting from multi authenticache. So, a user has many roles and a role has many users. This is my running first Laravel blog project. For example, a user may be assigned the role of "Author" and "Editor" however, those roles may also be assigned to other users as well. An example of a many-to-many relationship is a user that has many roles and those roles are also shared by other users in the application. Many-to-many relations are slightly more complicated than hasOne and hasMany relationships. Return $this -> throughEnvironments () -> hasDeployments () Eloquent makes managing and working with these relationships easy, and supports a variety of common relationships: For example, a blog post may have many comments or an order could be related to the user who placed it. Counting Related Models On Morph To Relationshipsĭatabase tables are often related to one another.Defining Custom Intermediate Table Models.Ordering Queries Via Intermediate Table Columns.Do note that this sorting is less efficient than calling the 'orderBy' method available to the Query Builder. Filtering Queries Via Intermediate Table Columns Order By The Eloquent Collection If you already get the eloquent collection such as by using 'all ()' and then chaining it with the 'sortBy ()' method.The second way is by eager loading the relationship with an order by statement. Now, whenever you call $company->users (as a collection), or $company->users() (as a query builder), the users will be automatically ordered by their name. So, in this case, Eloquent assumes that the Phone model has a userid column. Eloquent determines the foreign key name by examining the name of the relationship method and suffixing the method name with id. Return $this->hasMany(User::class)->orderBy('name') When invoking the user method, Eloquent will attempt to find a User model that has an id which matches the userid column on the Phone model. However, just in case you landed on this article wondering how to order an Eloquent relationship, here's three techniques you can use.įirst, you can simply append an order by statement to your relationship: class Company extends Model In fact, you might want to a order database query by a relationship value without even loading that relationship from the database! We're not trying to simply order the results of the relationship itself. To be clear, what we're trying to do here is order an Eloquent model database query by the value of one of its relationships. This article will cover the following relationship types: And yet, this is a common enough thing to want to do! However, it always involves ordering by a column in a separate database table, and that's what makes it somewhat tricky, especially compared to a normal order by. The way to do this is different depending on the relationship type. For example, maybe we want to order some users by the name of their company, which is in a separate companies table. In this article we're going to explore how to order database queries by the value (column) of an Eloquent relationship.
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