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391 lines
8.0 KiB
Markdown
391 lines
8.0 KiB
Markdown
# v2.0 Upgrade Guide
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`ObjectType`, `Interface`, `InputObjectType`, `Scalar` and `Enum` implementations
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have been quite simplified, without the need to define a explicit Metaclass for each subtype.
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It also improves the field resolvers, [simplifying the code](#simpler-resolvers) the
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developer has to write to use them.
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**Deprecations:**
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* [`AbstractType`](#abstracttype-deprecated)
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* [`resolve_only_args`](#resolve_only_args)
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* [`Mutation.Input`](#mutationinput)
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**Breaking changes:**
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* [`Simpler Resolvers`](#simpler-resolvers)
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* [`Node Connections`](#node-connections)
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**New Features!**
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* [`InputObjectType`](#inputobjecttype)
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* [`Meta as Class arguments`](#meta-as-class-arguments) (_only available for Python 3_)
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> The type metaclasses are now deleted as they are no longer necessary. If your code was depending
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> on this strategy for creating custom attrs, see an [example on how to do it in 2.0](https://github.com/graphql-python/graphene/blob/v2.0.0/graphene/tests/issues/test_425.py).
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## Deprecations
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### AbstractType deprecated
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AbstractType is deprecated in graphene 2.0, you can now use normal inheritance instead.
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Before:
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```python
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class CommonFields(AbstractType):
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name = String()
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class Pet(CommonFields, Interface):
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pass
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```
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With 2.0:
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```python
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class CommonFields(object):
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name = String()
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class Pet(CommonFields, Interface):
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pass
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```
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### resolve\_only\_args
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`resolve_only_args` is now deprecated as the resolver API has been simplified.
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Before:
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```python
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class User(ObjectType):
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name = String()
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@resolve_only_args
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def resolve_name(self):
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return self.name
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```
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With 2.0:
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```python
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class User(ObjectType):
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name = String()
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def resolve_name(self, info):
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return self.name
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```
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### Mutation.Input
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`Mutation.Input` is now deprecated in favor of using `Mutation.Arguments` (`ClientIDMutation` still uses `Input`).
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Before:
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```python
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class User(Mutation):
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class Input:
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name = String()
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```
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With 2.0:
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```python
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class User(Mutation):
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class Arguments:
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name = String()
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```
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## Breaking Changes
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### Simpler resolvers
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All the resolvers in graphene have been simplified.
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Prior to Graphene `2.0`, all resolvers required four arguments: `(root, args, context, info)`.
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Now, resolver `args` are passed as keyword arguments to the function, and `context` argument dissapeared in favor of `info.context`.
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Before:
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```python
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my_field = graphene.String(my_arg=graphene.String())
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def resolve_my_field(self, args, context, info):
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my_arg = args.get('my_arg')
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return ...
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```
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With 2.0:
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```python
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my_field = graphene.String(my_arg=graphene.String())
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def resolve_my_field(self, info, my_arg):
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return ...
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```
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**PS.: Take care with receiving args like `my_arg` as above. This doesn't work for optional (non-required) arguments as stantard `Connection`'s arguments (first, before, after, before).**
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You may need something like this:
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```python
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def resolve_my_field(self, info, known_field1, known_field2, **args): ## get other args with: args.get('arg_key')
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```
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And, if you need the context in the resolver, you can use `info.context`:
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```python
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my_field = graphene.String(my_arg=graphene.String())
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def resolve_my_field(self, info, my_arg):
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context = info.context
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return ...
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```
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### Node Connections
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Node types no longer have a `Connection` by default.
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In 2.0 and onwards `Connection`s should be defined explicitly.
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Before:
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```python
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class User(ObjectType):
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class Meta:
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interfaces = [relay.Node]
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name = String()
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class Query(ObjectType):
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user_connection = relay.ConnectionField(User)
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```
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With 2.0:
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```python
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class User(ObjectType):
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class Meta:
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interfaces = [relay.Node]
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name = String()
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class UserConnection(relay.Connection):
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class Meta:
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node = User
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class Query(ObjectType):
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user_connection = relay.ConnectionField(UserConnection)
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```
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## Node.get_node
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The method `get_node` in `ObjectTypes` that have `Node` as interface, changes its API.
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From `def get_node(cls, id, context, info)` to `def get_node(cls, info, id)`.
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```python
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class MyObject(ObjectType):
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class Meta:
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interfaces = (Node, )
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@classmethod
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def get_node(cls, id, context, info):
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return ...
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```
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To:
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```python
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class MyObject(ObjectType):
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class Meta:
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interfaces = (Node, )
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@classmethod
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def get_node(cls, info, id):
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return ...
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```
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## Node.get_node_from_global_id
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The parameters' order of `get_node_from_global_id` method has changed. You may need to adjust your [Node Root Field](http://docs.graphene-python.org/en/latest/relay/nodes/#node-root-field) and maybe other places that uses this method to obtain an object.
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Before:
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```python
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class RootQuery(object):
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...
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node = Field(relay.Node, id=ID(required=True))
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def resolve_node(self, args, context, info):
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node = relay.Node.get_node_from_global_id(args['id'], context, info)
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return node
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```
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Now:
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```python
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class RootQuery(object):
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...
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node = Field(relay.Node, id=ID(required=True))
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def resolve_node(self, info, id):
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node = relay.Node.get_node_from_global_id(info, id)
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return node
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```
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## Mutation.mutate
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Now only receives (`self`, `info`, `**args`) and is not a @classmethod
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Before:
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```python
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class SomeMutation(Mutation):
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...
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@classmethod
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def mutate(cls, instance, args, context, info):
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...
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```
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With 2.0:
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```python
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class SomeMutation(Mutation):
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...
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def mutate(self, info, **args):
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...
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```
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With 2.0 you can also get your declared (as above) `args` this way:
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```python
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class SomeMutation(Mutation):
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class Arguments:
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first_name = String(required=True)
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last_name = String(required=True)
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...
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def mutate(self, info, first_name, last_name):
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...
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```
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## ClientIDMutation.mutate_and_get_payload
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Now only receives (`root`, `info`, `**input`)
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### Middlewares
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If you are using Middelwares, you need to some adjustments:
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Before:
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```python
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class MyGrapheneMiddleware(object):
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def resolve(self, next_mw, root, args, context, info):
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## Middleware code
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return next_mw(root, args, context, info)
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```
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With 2.0:
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```python
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class MyGrapheneMiddleware(object):
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def resolve(self, next_mw, root, info, **args):
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context = info.context
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## Middleware code
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info.context = context
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return next_mw(root, info, **args)```
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```
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## New Features
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### InputObjectType
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If you are using `InputObjectType`, you now can access
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its fields via `getattr` (`my_input.myattr`) when resolving, instead of
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the classic way `my_input['myattr']`.
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And also use custom defined properties on your input class.
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Example. Before:
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```python
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class UserInput(InputObjectType):
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id = ID(required=True)
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def is_valid_input(input):
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return input.get('id').startswith('userid_')
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class Query(ObjectType):
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user = graphene.Field(User, input=UserInput())
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@resolve_only_args
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def resolve_user(self, input):
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user_id = input.get('id')
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if is_valid_input(user_id):
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return get_user(user_id)
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```
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With 2.0:
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```python
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class UserInput(InputObjectType):
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id = ID(required=True)
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@property
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def is_valid(self):
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return self.id.startswith('userid_')
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class Query(ObjectType):
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user = graphene.Field(User, input=UserInput())
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def resolve_user(self, info, input):
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if input.is_valid:
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return get_user(input.id)
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```
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### Meta as Class arguments
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Now you can use the meta options as class arguments (**ONLY PYTHON 3**).
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Before:
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```python
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class Dog(ObjectType):
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class Meta:
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interfaces = [Pet]
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name = String()
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```
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With 2.0:
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```python
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class Dog(ObjectType, interfaces=[Pet]):
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name = String()
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```
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### Abstract types
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Now you can create abstact types super easily, without the need of subclassing the meta.
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```python
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class Base(ObjectType):
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class Meta:
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abstract = True
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id = ID()
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def resolve_id(self, info):
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return "{type}_{id}".format(
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type=self.__class__.__name__,
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id=self.id
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)
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```
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### UUID Scalar
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In Graphene 2.0 there is a new dedicated scalar for UUIDs, `UUID`.
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