https://github.com/codeenigma/entity-validation-examples

Drupal 8 Entity Validation API examples to accompany a blog post
https://github.com/codeenigma/entity-validation-examples

drupal drupal8

Last synced: 4 months ago
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Drupal 8 Entity Validation API examples to accompany a blog post

• Host: GitHub
• URL: https://github.com/codeenigma/entity-validation-examples
• Owner: codeenigma
• License: mit
• Created: 2018-07-18T10:54:31.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-07-24T13:24:46.000Z (over 6 years ago)
• Last Synced: 2024-09-27T10:41:08.987Z (5 months ago)
• Topics: drupal, drupal8
• Language: PHP
• Homepage:
• Size: 7.81 KB
• Stars: 6
• Watchers: 6
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# Entity Validation Examples

This Drupal 8 module accompanies a Code Enigma blog post.

It illustrates how to use the Drupal 8 Entity Validation API to add different validation 

constraints to the entity creation process.

Blog post: [Introduction to Drupal 8 Entity Validation](https://blog.codeenigma.com/introduction-to-drupal-8-entity-validation-f0aa37c1f9a3)

The examples are kept short and avoid anything that is not related to the 

actual topic of entity validation.

## Example 1: ArticleLimitConstraint

This example limits the creation of nodes of the type article to a 

specified number (2).

In a real-world scenario this limit would probably be configured using 

a configuration form, or specified with a config variable in settings.php.

The module does the following:

1. Defines a new constraint: ```ArticleLimitConstraint```.

2. Defines a new constraint validator: ```ArticleLimitConstraintValidator```

3. Attaches the constraint to entities of the type _node_ using a 

```hook_entity_type_alter``` implementation.

### How to test

To test this functionality:

* Enable the module.

* Create 2 articles.

* Attempt to create a 3rd article and notice the error message.

## Example 2

Coming soon.