Chapters

29 Chapters | 1:34:37 |

01

Introduction

1:00
02

ManyToOne Doctrine Relationships

4:40
03

Sharing Data between Fixture Classes

1:49
04

Restricting Edit Access to Owners

1:53
05

Using a shortcut Base Controller Class

2:30
06

Using PHPDoc for Auto-Completion

1:26
07

OneToMany: The Inverse Side of a Relationship

5:37
08

Doctrine Extensions: Sluggable and Timestampable

4:30
09

Using the slug in the Event URL

2:04
10

Adding createdAt and updatedAt Timestampable Fields

1:41
11

Creating a Custom orderBy Query

2:11
12

ManyToMany Relationship

2:37
13

Using the ManyToMany so Users can Attend an Event

4:53
14

More with ManyToMany: Avoiding Duplicates

2:51
15

JSON up in your Response

2:50
16

Come on, Set the Content-Type Header!

3:19
17

Adding the AJAX Touch: JavaScript

2:16
18

Customizing Error Pages and How Errors are Handled

6:01
19

Render another Controller in Twig

4:28
20

Creating a Pretty CSV Download

4:19
21

Your Very First Service

4:42
22

Symfony Overlord: The Service Container

4:58
23

Configuration Loading and Type-Hinting

2:01
24

Dependency Inject All the Things

3:14
25

Twig Extensions and Dependency Injection Tags

4:33
26

Doctrine is in your Lifecycle (with Callbacks)

2:08
27

Doctrine Event Listeners

5:59
28

Doctrine Listeners on Update

2:48
29

Keep Going!

1:19

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14.

More with ManyToMany: Avoiding Duplicates

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4 Comments

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guest 8 years ago

if ($event->hasAttendee($this->getUser())) {
$event->getAttendees()->removeElement($this->getUser());
}

$em->persist($event);
$em->flush();

is it not better to do this instead? Why we should disturb our database if nothing needed?

if ($event->hasAttendee($this->getUser())) {
$event->getAttendees()->removeElement($this->getUser());

$em->persist($event);
$em->flush();
}

|

weaverryan SFCASTS guest 8 years ago

Hey there!

Yes, you're right! But either way, Doctrine won't make a query to the database if it doesn't need to. In other words, both ways will result in 0 queries if there is no change. But, there will be a small performance boost with your method, since Doctrine doesn't even need to check on this.

Cheers!

|

Ivan 8 years ago

hasAttendee doing its job well in a Twig template.
But when a user tries to add new relationship it still could lead to error due to concurrency reasons.
Wouldn't it be better if we just try{} to add a relationship no matter what and then catch() the "duplicate key" exception?

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MolloKhan SFCASTS Ivan 8 years ago edited

Hey Ivan!
In that case you might preffer to create a new method for adding attendees like this:


public function addAttendee(User $user){
    if(!$this->getAttendees()->contains($user){
        $this->getAttendees()->add($user);
    }
}

So you can get rid of adding that try catch in every place where you need to add attendees

Have a nice day!

|

Symfony 2

What PHP libraries does this tutorial use?

// composer.json
{
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": "~2.4", // v2.4.2
        "doctrine/orm": "~2.2,>=2.2.3", // v2.4.2
        "doctrine/doctrine-bundle": "~1.2", // v1.2.0
        "twig/extensions": "~1.0", // v1.0.1
        "symfony/assetic-bundle": "~2.3", // v2.3.0
        "symfony/swiftmailer-bundle": "~2.3", // v2.3.5
        "symfony/monolog-bundle": "~2.4", // v2.5.0
        "sensio/distribution-bundle": "~2.3", // v2.3.4
        "sensio/framework-extra-bundle": "~3.0", // v3.0.0
        "sensio/generator-bundle": "~2.3", // v2.3.4
        "incenteev/composer-parameter-handler": "~2.0", // v2.1.0
        "doctrine/doctrine-fixtures-bundle": "~2.2.0", // v2.2.0
        "ircmaxell/password-compat": "~1.0.3", // 1.0.3
        "phpunit/phpunit": "~4.1", // 4.1.0
        "stof/doctrine-extensions-bundle": "~1.1.0" // v1.1.0
    }
}

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