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Informations about the package eloquent-polymorphic-model

Eloquent extension for polymorphic models

Extend eloquent facilities to map one class Hierarchy branch to one table in database.

Purpose

If you have one table on database (let say a Person table with fields person_id, name and gender) and you want to map it with your class hierarchy (let say a parent class Person and 2 childs Man extends Person and Woman extends Person), then you can use this package to make the mapping automatically.

Configure class mapping

Retrieving instances from the parent class

In parent class, define the Model as usual :

Define empty children classes :

In parent class use the EloquentPolymorphism\PolymorphicParent helper You must define how database results will be bound with your class hierarchy (in my example it depends on the gender field value)

With that you can retrieve a collection of Men and Women :

Retrieving instances from children classes

Now we must define constraints in child classes (otherwise Man::all() would also retrieve a collection of men and women). For that in children classes you have to use the trait EloquentPolymorphism\PolymorphicChild and define the polymorphismScope constraint ;

Now if you write Man::all() or any more complex query on Man model it will result on a collection of Man instances, corresponding to the table entries which represent men.

Optionally, you can overwrite the name of the scope you just defined in Man class adding this code either in parent or child class :

Updating/Creating model :

default attributes

It is strongly recommended to define default attributes values in children classes.

In our example it would be comfortable to write :

without having to set her gender.

For this purpose, you must overwrite method setChildDefaultAttributes in children classes

verifications on save method call

The trait PolymorphicParent prevents unnatural update/create on children like as example :

This is done by checking that the conditions defined in instanceFactory method would effectively retrieve an instance of Man. You can overwrite this behaviour by implementing the method checkHierarchyConstraintsBeforeSaving

Complex queries, relations, etc.

You can use all other functionality of Eloquent models like usual. In particular, you can define relations and complex queries as needed.

Contribute

Fork the project in your github account. Init gitflow

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Code

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Requires php Version 7.*
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ext-json Version *
illuminate/database Version *
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