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58 lines
1.7 KiB
ReStructuredText
58 lines
1.7 KiB
ReStructuredText
Mutations
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=========
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Most APIs don’t just allow you to read data, they also allow you to
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write.
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In GraphQL, this is done using mutations. Just like queries,
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Relay puts some additional requirements on mutations, but Graphene
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nicely manages that for you. All you need to do is make your mutation a
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subclass of ``relay.ClientIDMutation``.
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.. code:: python
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class IntroduceShip(relay.ClientIDMutation):
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class Input:
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ship_name = graphene.String(required=True)
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faction_id = graphene.String(required=True)
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ship = graphene.Field(Ship)
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faction = graphene.Field(Faction)
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@classmethod
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def mutate_and_get_payload(cls, input, context, info):
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ship_name = input.get('ship_name')
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faction_id = input.get('faction_id')
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ship = create_ship(ship_name, faction_id)
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faction = get_faction(faction_id)
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return IntroduceShip(ship=ship, faction=faction)
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Accepting Files
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---------------
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Mutations can also accept files, that's how it will work with different integrations:
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.. code:: python
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class UploadFile(graphene.ClientIDMutation):
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class Input:
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pass
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# nothing needed for uploading file
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# your return fields
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success = graphene.String()
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@classmethod
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def mutate_and_get_payload(cls, input, context, info):
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# When using it in Django, context will be the request
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files = context.FILES
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# Or, if used in Flask, context will be the flask global request
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# files = context.files
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# do something with files
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return UploadFile(success=True)
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