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b5ad7aa47aMutable objects can be challenging to work with in larger codebases because different parts of a system may modify the same instance, making it difficult to trace where and when changes occurred. This becomes especially problematic when debugging unexpected behaviour. By making `Validator` immutable, we ensure that adding rules via `with()` returns a new instance rather than mutating the original, and we use the `with()` method inside `__call()`, making every call to a rule into a clone of the current `Validator`. This provides several benefits: 1. Predictability: A `Validator` instance will always behave the same way throughout its lifetime, regardless of what other parts of the codebase do. 2. Safe dependency injection: Users can now confidently inject a base `Validator` from a DI container, knowing that any modifications made elsewhere will not affect their instance. 3. Easier debugging: Since validators cannot be mutated after creation, there's no need to track down where an unexpected rule was added. 4. Reusability: Users can create an initial `Validator` with some base rules and reuse it by just adding new rules to the chain without affecting the base `Validator`.
124 lines
3.2 KiB
Markdown
124 lines
3.2 KiB
Markdown
# KeySet
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- `KeySet(KeyRelated $rule, KeyRelated ...$rules)`
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Validates a keys in a defined structure.
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```php
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v::keySet(
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v::keyExists('foo'),
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v::keyExists('bar')
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)->isValid(['foo' => 'whatever', 'bar' => 'something']); // true
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```
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It will validate the keys in the array with the rules passed in the constructor.
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```php
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v::keySet(
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v::key('foo', v::intVal())
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)->isValid(['foo' => 42]); // true
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v::keySet(
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v::key('foo', v::intVal())
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)->isValid(['foo' => 'string']); // false
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```
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Extra keys are not allowed:
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```php
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v::keySet(
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v::key('foo', v::intVal())
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)->isValid(['foo' => 42, 'bar' => 'String']); // false
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```
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Missing required keys are not allowed:
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```php
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v::keySet(
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v::key('foo', v::intVal()),
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v::key('bar', v::stringType()),
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v::key('baz', v::boolType())
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)->isValid(['foo' => 42, 'bar' => 'String']); // false
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```
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Missing non-required keys are allowed:
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```php
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v::keySet(
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v::key('foo', v::intVal()),
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v::key('bar', v::stringType()),
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v::keyOptional('baz', v::boolType())
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)->isValid(['foo' => 42, 'bar' => 'String']); // true
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```
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Alternatively, you can pass a chain of key-related rules to `keySet()`:
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```php
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v::keySet(
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v::init()
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->key('foo', v::intVal())
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->key('bar', v::stringType())
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->keyOptional('baz', v::boolType())
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)->isValid(['foo' => 42, 'bar' => 'String']); // true
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```
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It is not possible to negate `keySet()` rules with `not()`.
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The keys' order is not considered in the validation.
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## Templates
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### `KeySet::TEMPLATE_STANDARD`
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| Mode | Template |
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| ---------- | ----------------------------- |
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| `default` | {{subject}} validation failed |
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| `inverted` | {{subject}} validation passed |
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### `KeySet::TEMPLATE_BOTH`
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| Mode | Template |
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| ---------- | ------------------------------------------------ |
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| `default` | {{subject}} contains both missing and extra keys |
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| `inverted` | {{subject}} contains no missing or extra keys. |
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### `KeySet::TEMPLATE_EXTRA_KEYS`
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| Mode | Template |
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| ---------- | ---------------------------------- |
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| `default` | {{subject}} contains extra keys |
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| `inverted` | {{subject}} contains no extra keys |
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### `KeySet::TEMPLATE_MISSING_KEYS`
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| Mode | Template |
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| ---------- | ------------------------------------ |
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| `default` | {{subject}} contains missing keys |
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| `inverted` | {{subject}} contains no missing keys |
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## Template placeholders
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| Placeholder | Description |
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| ----------- | ---------------------------------------------------------------- |
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| `subject` | The validated input or the custom validator name (if specified). |
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## Categorization
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- Arrays
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- Nesting
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- Structures
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## Changelog
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| Version | Description |
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| ------: | ----------------------------------------------------- |
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| 3.0.0 | Requires at least one key-related rule |
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| 2.3.0 | KeySet is NonNegatable, fixed message with extra keys |
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| 1.0.0 | Created |
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---
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See also:
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- [ArrayVal](ArrayVal.md)
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- [Key](Key.md)
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