symfony-validation

Name: symfony-validation
Author: aligundogdu

32stars3forks

How to install symfony-validation?

aligundogdu/symfony-hexagonal-skill/symfony-validation

$npx -y skills add aligundogdu/symfony-hexagonal-skill --skill symfony-validation

Installs into the current project.

Summary

Symfony validation — 3-layer validation strategy, constraints, DTO validation, domain invariants, validation groups, custom validators. Triggers on: validation, validator, constraint, DTO validation, input validation, invariant, assert, validation group

Files · 1

View on GitHub

SKILL.md

1	# Symfony Validation
2
3	You are an expert in multi-layer validation within Symfony hexagonal architecture.
4
5	## When to Activate
6
7	- User needs input validation
8	- User asks about validation strategies
9	- User needs custom constraints
10	- User mentions DTO validation or domain invariants
11
12	## 3-Layer Validation Strategy
13
14	### Layer 1: Presentation (Input Validation)
15	Where: Controllers, request listeners
16	What: Format validation — is the input well-formed?
17	How: Symfony Validator on request DTOs
18
19	```php
20	// Request DTO with constraints
21	final readonly class CreateUserRequest
22	{
23	public function __construct(
24	#[Assert\NotBlank]
25	#[Assert\Email]
26	public string $email,
27
28	#[Assert\NotBlank]
29	#[Assert\Length(min: 2, max: 100)]
30	public string $name,
31
32	#[Assert\NotBlank]
33	#[Assert\Length(min: 8)]
34	#[Assert\Regex(pattern: '/[A-Z]/', message: 'Must contain uppercase')]
35	#[Assert\Regex(pattern: '/[0-9]/', message: 'Must contain a number')]
36	public string $password,
37	) {
38	}
39	}
40	```
41
42	### Layer 2: Application (DTO/Command Validation)
43	Where: Command/Query classes, validated by Messenger middleware
44	What: Business rule pre-checks — are the values acceptable?
45	How: Symfony Validator constraints on command properties
46
47	```php
48	final readonly class RegisterUser
49	{
50	public function __construct(
51	#[Assert\NotBlank]
52	#[Assert\Email]
53	public string $email,
54
55	#[Assert\NotBlank]
56	public string $name,
57
58	#[Assert\NotBlank]
59	public string $password,
60	) {
61	}
62	}
63	```
64
65	The `validation` middleware on the bus auto-validates before handler execution.
66
67	### Layer 3: Domain (Invariants)
68	Where: Entity constructors, value objects, business methods
69	What: Business invariants — is the operation valid in domain context?
70	How: Pure PHP validation, throw domain exceptions
71
72	```php
73	// Value object self-validates
74	final readonly class Email
75	{
76	public function __construct(public string $value)
77	{
78	if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
79	throw InvalidEmailException::forValue($value);
80	}
81	}
82	}
83
84	// Entity protects invariants
85	final class Order
86	{
87	public function cancel(string $reason): void
88	{
89	if ($this->status === OrderStatus::DELIVERED) {
90	throw CannotCancelDeliveredException::forOrder($this->id);
91	}
92	// ...
93	}
94	}
95	```
96
97	## References
98
99	See `references/` for detailed guides:
100	- `validation-layers.md` — Full examples for each layer, custom constraints, groups

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symfony-validation

32stars3forks

View on GitHub

How to install symfony-validation?

aligundogdu/symfony-hexagonal-skill/symfony-validation

$npx -y skills add aligundogdu/symfony-hexagonal-skill --skill symfony-validation

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Symfony Validation
2
3	You are an expert in multi-layer validation within Symfony hexagonal architecture.
4
5	## When to Activate
6
7	- User needs input validation
8	- User asks about validation strategies
9	- User needs custom constraints
10	- User mentions DTO validation or domain invariants
11
12	## 3-Layer Validation Strategy
13
14	### Layer 1: Presentation (Input Validation)
15	Where: Controllers, request listeners
16	What: Format validation — is the input well-formed?
17	How: Symfony Validator on request DTOs
18
19	```php
20	// Request DTO with constraints
21	final readonly class CreateUserRequest
22	{
23	public function __construct(
24	#[Assert\NotBlank]
25	#[Assert\Email]
26	public string $email,
27
28	#[Assert\NotBlank]
29	#[Assert\Length(min: 2, max: 100)]
30	public string $name,
31
32	#[Assert\NotBlank]
33	#[Assert\Length(min: 8)]
34	#[Assert\Regex(pattern: '/[A-Z]/', message: 'Must contain uppercase')]
35	#[Assert\Regex(pattern: '/[0-9]/', message: 'Must contain a number')]
36	public string $password,
37	) {
38	}
39	}
40	```
41
42	### Layer 2: Application (DTO/Command Validation)
43	Where: Command/Query classes, validated by Messenger middleware
44	What: Business rule pre-checks — are the values acceptable?
45	How: Symfony Validator constraints on command properties
46
47	```php
48	final readonly class RegisterUser
49	{
50	public function __construct(
51	#[Assert\NotBlank]
52	#[Assert\Email]
53	public string $email,
54
55	#[Assert\NotBlank]
56	public string $name,
57
58	#[Assert\NotBlank]
59	public string $password,
60	) {
61	}
62	}
63	```
64
65	The `validation` middleware on the bus auto-validates before handler execution.
66
67	### Layer 3: Domain (Invariants)
68	Where: Entity constructors, value objects, business methods
69	What: Business invariants — is the operation valid in domain context?
70	How: Pure PHP validation, throw domain exceptions
71
72	```php
73	// Value object self-validates
74	final readonly class Email
75	{
76	public function __construct(public string $value)
77	{
78	if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
79	throw InvalidEmailException::forValue($value);
80	}
81	}
82	}
83
84	// Entity protects invariants
85	final class Order
86	{
87	public function cancel(string $reason): void
88	{
89	if ($this->status === OrderStatus::DELIVERED) {
90	throw CannotCancelDeliveredException::forOrder($this->id);
91	}
92	// ...
93	}
94	}
95	```
96
97	## References
98
99	See `references/` for detailed guides:
100	- `validation-layers.md` — Full examples for each layer, custom constraints, groups

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