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UPGRADE FROM 3.0 to 3.1
=======================
DependencyInjection
-------------------
* Using unsupported configuration keys in YAML configuration files has been
deprecated and will raise an exception in Symfony 4.0.
* Using unsupported options to configure service aliases has been deprecated
and will raise an exception in Symfony 4.0.
Form
----
* The `choices_as_values` option of the `ChoiceType` has been deprecated and
will be removed in Symfony 4.0.
* Support for data objects that implements both `Traversable` and `ArrayAccess`
in `ResizeFormListener::preSubmit` method has been deprecated and will be
removed in Symfony 4.0.
* `TextType` now implements `DataTransformerInterface` and will always return
an empty string when `empty_data` option is explicitly assigned to it.
* Using callable strings as choice options in ChoiceType has been deprecated
in favor of `PropertyPath` in Symfony 4.0 use a "\Closure" instead.
Before:
```php
'choice_value' => new PropertyPath('range'),
'choice_label' => 'strtoupper',
```
After:
```php
'choice_value' => 'range',
'choice_label' => function ($choice) {
return strtoupper($choice);
},
```
* Caching of the loaded `ChoiceListInterface` in the `LazyChoiceList` has been deprecated,
it must be cached in the `ChoiceLoaderInterface` implementation instead.
FrameworkBundle
---------------
* As it was never an officially supported feature, the support for absolute
template paths has been deprecated and will be removed in Symfony 4.0.
* The abstract `Controller` class now has a `json()` helper method that creates
a `JsonResponse`. If you have existing controllers extending `Controller`
that contain a method with this name, you need to rename that method to avoid
conflicts.
* The following form types registered as services have been deprecated and
will be removed in Symfony 4.0; use their fully-qualified class name instead:
- `"form.type.birthday"`
- `"form.type.checkbox"`
- `"form.type.collection"`
- `"form.type.country"`
- `"form.type.currency"`
- `"form.type.date"`
- `"form.type.datetime"`
- `"form.type.email"`
- `"form.type.file"`
- `"form.type.hidden"`
- `"form.type.integer"`
- `"form.type.language"`
- `"form.type.locale"`
- `"form.type.money"`
- `"form.type.number"`
- `"form.type.password"`
- `"form.type.percent"`
- `"form.type.radio"`
- `"form.type.range"`
- `"form.type.repeated"`
- `"form.type.search"`
- `"form.type.textarea"`
- `"form.type.text"`
- `"form.type.time"`
- `"form.type.timezone"`
- `"form.type.url"`
- `"form.type.button"`
- `"form.type.submit"`
- `"form.type.reset"`
* The `framework.serializer.cache` option and the service
`serializer.mapping.cache.apc` have been deprecated. APCu should now be
automatically used when available.
HttpKernel
----------
* Passing non-scalar values as URI attributes to the ESI and SSI renderers has been
deprecated and will be removed in Symfony 4.0. The inline fragment
renderer should be used with non-scalar attributes.
* The `ControllerResolver::getArguments()` method has been deprecated and will
be removed in 4.0. If you have your own `ControllerResolverInterface`
implementation, you should inject either an `ArgumentResolverInterface`
instance or the new `ArgumentResolver` in the `HttpKernel`.
Serializer
----------
* Passing a Doctrine `Cache` instance to the `ClassMetadataFactory` has been
deprecated and will not be supported in Symfony 4.0. You should use the
`CacheClassMetadataFactory` class instead.
* The `AbstractObjectNormalizer::isAttributeToNormalize()` method has been removed
because it was initially added by mistake, has never been used and is not tested
nor documented.
Translation
-----------
* Deprecated the backup feature of the file dumper classes. It will be removed
in Symfony 4.0.
Yaml
----
* Usage of `%` at the beginning of an unquoted string has been deprecated and
will lead to a `ParseException` in Symfony 4.0.
* The `Dumper::setIndentation()` method is deprecated and will be removed in
Symfony 4.0. Pass the indentation level to the constructor instead.
* Deprecated support for passing `true`/`false` as the second argument to the
`parse()` method to trigger exceptions when an invalid type was passed.
Before:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', true);
```
After:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
```
* Deprecated support for passing `true`/`false` as the third argument to the
`parse()` method to toggle object support.
Before:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', false, true);
```
After:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_OBJECT);
```
* Deprecated support for passing `true`/`false` as the fourth argument to the
`parse()` method to parse objects as maps.
Before:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', false, false, true);
```
After:
```php
Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_OBJECT_FOR_MAP);
```
* Deprecated support for passing `true`/`false` as the fourth argument to the
`dump()` method to trigger exceptions when an invalid type was passed.
Before:
```php
Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, true);
```
After:
```php
Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE);
```
* Deprecated support for passing `true`/`false` as the fifth argument to the
`dump()` method to toggle object support.
Before:
```php
Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, false, true);
```
After:
```php
Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, Yaml::DUMP_OBJECT);
```
* The `!!php/object` tag to indicate dumped PHP objects has been deprecated
and will be removed in Symfony 4.0. Use the `!php/object` tag instead.
Validator
---------
* The `DateTimeValidator::PATTERN` constant has been deprecated and will be
removed in Symfony 4.0.
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