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Category: Symfony Framework

In all web applications, user input is handled by HTML Forms. Symfony has the form component to make easy and fast form implementation and handling. Here is a basic form layout that you may use to implement your own forms:

 

Basic Form Creation:
Let's say you want to create a simple contact form with a name, email, and message field.

// src/Form/ContactFormType.php
namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\EmailType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class ContactFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class, ['label' => 'Name'])
            ->add('email', EmailType::class, ['label' => 'Email'])
            ->add('message', TextareaType::class, ['label' => 'Message']);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            // Configure the data class to store the form data (optional)
            'data_class' => 'App\Entity\Contact', // Replace with your entity class if using one
        ]);
    }
}

 

Details
Category: Symfony Framework

To implement Symfony forms with children forms (form collections) to add or remove elements, we'll create a simple Book entity related to a Author entity in a one-to-many relationship. We'll use form collections to allow users to add, update or remove authors while creating or editing a book.

 

Create the Entity Classes:
Create the Book and Author entity classes and set up the one-to-many relationship between them.

// src/Entity/Book.php
namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Book
{
    // ... other properties and annotations ...

    /**
     * @ORM\OneToMany(targetEntity="Author", mappedBy="book", cascade={"persist", "remove"}, orphanRemoval=true)
     */
    private $authors;

    public function __construct()
    {
        $this->authors = new ArrayCollection();
    }

    // ... getters and setters ...
}

// src/Entity/Author.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Author
{
    // ... other properties and annotations ...

    /**
     * @ORM\ManyToOne(targetEntity="Book", inversedBy="authors")
     * @ORM\JoinColumn(name="book_id", referencedColumnName="id")
     */
    private $book;

    // ... getters and setters ...
}

 

Create the Form Type Classes:
Now, create the form type classes for the Book and Author entities. In the BookType class, use the CollectionType field type to handle the one-to-many relationship with AuthorType as the embedded child form.

Details
Category: Symfony Framework

Implementing a many-to-many relationship with Symfony forms involves using the EntityType field type with multiple selections enabled. In this example, we'll create a simple application with User and Role entities in a many-to-many relationship. We'll use checkboxes to allow multiple role selections when creating or editing a user.

 

Create the Entity Classes:

Create the User and Role entity classes and set up the many-to-many relationship between them.

// src/Entity/User.php
namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class User
{
    // ... other properties and annotations ...

    /**
     * @ORM\ManyToMany(targetEntity="Role", inversedBy="users")
     * @ORM\JoinTable(name="user_roles")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }

    // ... getters and setters ...
}

// src/Entity/Role.php
namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Role
{
    // ... other properties and annotations ...

    /**
     * @ORM\ManyToMany(targetEntity="User", mappedBy="roles")
     */
    private $users;

    public function __construct()
    {
        $this->users = new ArrayCollection();
    }

    // ... getters and setters ...
}

 

Create the Form Type Class:
Now, create the form type class for the User entity, including the EntityType field for the Role relationship with multiple selections enabled.

Details
Category: Symfony Framework

Implementing a Symfony form with a one-to-many relationship shown in a dropdown involves using Symfony's EntityType field type. In this example, we'll create a simple task management application with a Task entity related to a Category entity in a one-to-many relationship. We'll display the categories in a dropdown when creating or editing a task.

 

Create the Entity Classes: Assuming you already have a Task entity class and a Category entity class, make sure they are correctly related with a one-to-many relationship.

// src/Entity/Task.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Task
{
    // ... other properties and annotations ...

    /**
     * @ORM\ManyToOne(targetEntity="Category", inversedBy="tasks")
     * @ORM\JoinColumn(name="category_id", referencedColumnName="id")
     */
    private $category;

    // ... getters and setters ...
}

// src/Entity/Category.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Category
{
    // ... other properties and annotations ...

    /**
     * @ORM\OneToMany(targetEntity="Task", mappedBy="category")
     */
    private $tasks;

    // ... getters and setters ...
}

 

Create the Form Type Class:
Now, create the form type class for the Task entity, including the EntityType field for the Category relationship.