|
| 1 | +# API Reference |
| 2 | + |
| 3 | +- [ObjectType](#ObjectType) |
| 4 | +- [SubscriptionType](#SubscriptionType) |
| 5 | +- [InputType](#InputType) |
| 6 | +- [ScalarType](#ScalarType) |
| 7 | +- [InterfaceType](#InterfaceType) |
| 8 | +- [UnionType](#UnionType) |
| 9 | +- [DirectiveType](#DirectiveType) |
| 10 | +- [DeferredType](#DeferredType) |
| 11 | +- [BaseType](#BaseType) |
| 12 | +- [make_executable_schema](#make_executable_schema) |
| 13 | +- [convert_case](#convert_case) |
1 | 14 |
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2 | 15 |
|
3 | 16 | ## `ObjectType`
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@@ -38,8 +51,6 @@ class QueryType(ObjectType):
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38 | 51 | return 2022
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39 | 52 | ```
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40 | 53 |
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41 |
| -> `ObjectType` could look up return type of `Int` scalar's `serialize` method and compare it with resolver's return type as extra safety net. |
42 |
| -
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43 | 54 | If resolver function is not present for field, default resolver implemented by `graphql-core` will be used in its place.
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44 | 55 |
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45 | 56 | In situations when field's name should be resolved to different value, custom mappings can be defined via `__aliases__` attribute:
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@@ -81,8 +92,6 @@ class UserType(ObjectType):
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81 | 92 | return None
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82 | 93 | ```
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83 | 94 |
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84 |
| -> `ObjectType` could raise error if resolver can't be matched to any field on type. |
85 |
| -
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86 | 95 |
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87 | 96 | ### `__requires__`
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88 | 97 |
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@@ -150,12 +159,13 @@ class ChatSubscriptions(SubscriptionType):
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150 | 159 | """
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151 | 160 | __requires__ = [ChatType]
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152 | 161 |
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153 |
| - async def resolve_chat(chat_id, *_): |
154 |
| - return await get_chat_from_db(chat_id) |
155 |
| - |
156 | 162 | async def subscribe_chat(*_):
|
157 | 163 | async for event in subscribe("chats"):
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158 | 164 | yield event["chat_id"]
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| 165 | + |
| 166 | + async def resolve_chat(chat_id, *_): |
| 167 | + # Optional |
| 168 | + return await get_chat_from_db(chat_id) |
159 | 169 | ```
|
160 | 170 |
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161 | 171 |
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@@ -412,3 +422,280 @@ schema = make_executable_schema(
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412 | 422 | merge_roots=False,
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413 | 423 | )
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414 | 424 | ```
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| 425 | + |
| 426 | +## `DeferredType` |
| 427 | + |
| 428 | +`DeferredType` names required GraphQL type as provided at later time: |
| 429 | + |
| 430 | +- Via `make_executable_schema` call |
| 431 | +- Or via other type's `__requires__` |
| 432 | + |
| 433 | +It's mostly used to define lazy relationships in reusable modules and to break circular relationships. |
| 434 | + |
| 435 | + |
| 436 | +### Type with `DeferredType` and other type passed to `make_executable_schema`: |
| 437 | + |
| 438 | +```python |
| 439 | +class QueryType(ObjectType): |
| 440 | + __schema__ = """ |
| 441 | + type Query { |
| 442 | + id: ID! |
| 443 | + users: [User!]! |
| 444 | + } |
| 445 | + """ |
| 446 | + __requires__ = [DeferredType("User")] |
| 447 | + |
| 448 | + |
| 449 | +class UserType(ObjectType): |
| 450 | + __schema__ = """ |
| 451 | + type User { |
| 452 | + id: ID! |
| 453 | + dateJoined: String! |
| 454 | + } |
| 455 | + """ |
| 456 | + |
| 457 | + |
| 458 | +schema = make_excutable_schema(QueryType, UserType) |
| 459 | +``` |
| 460 | + |
| 461 | + |
| 462 | +### Type with `DeferredType` and other type passed as dependency of third type: |
| 463 | + |
| 464 | +```python |
| 465 | +class UsersGroupType(ObjectType): |
| 466 | + __schema__ = """ |
| 467 | + type UsersGroup { |
| 468 | + id: ID! |
| 469 | + users: [User!]! |
| 470 | + } |
| 471 | + """ |
| 472 | + __requires__ = [UserType] |
| 473 | + |
| 474 | + |
| 475 | +class UserType(ObjectType): |
| 476 | + __schema__ = """ |
| 477 | + type User { |
| 478 | + id: ID! |
| 479 | + dateJoined: String! |
| 480 | + } |
| 481 | + """ |
| 482 | + |
| 483 | + |
| 484 | +class QueryType(ObjectType): |
| 485 | + __schema__ = """ |
| 486 | + type Query { |
| 487 | + id: ID! |
| 488 | + users: [User!]! |
| 489 | + groups: [UsersGroup!]! |
| 490 | + } |
| 491 | + """ |
| 492 | + __requires__ = [DeferredType("User"), UsersGroupType] |
| 493 | + |
| 494 | + |
| 495 | +schema = make_excutable_schema(QueryType) |
| 496 | +``` |
| 497 | + |
| 498 | + |
| 499 | +## `BaseType` |
| 500 | + |
| 501 | +Base type that all other types extend. You can use it to create custom types: |
| 502 | + |
| 503 | +```python |
| 504 | +from typing import Dict |
| 505 | + |
| 506 | +from ariadne_graphql_modules import BaseType |
| 507 | +from django.db.models import Model |
| 508 | +from graphql import GraphQLFieldResolver |
| 509 | + |
| 510 | +class ModelType(BaseType) |
| 511 | + __abstract__ = True |
| 512 | + __schema__ = str |
| 513 | + __model__ = Model |
| 514 | + |
| 515 | + resolvers: Dict[str, GraphQLFieldResolver] |
| 516 | + |
| 517 | + def __init_subclass__(cls) -> None: |
| 518 | + super().__init_subclass__() |
| 519 | + |
| 520 | + if cls.__dict__.get("__abstract__"): |
| 521 | + return |
| 522 | + |
| 523 | + cls.__abstract__ = False |
| 524 | + |
| 525 | + if not cls.__model__: |
| 526 | + raise ValueError( |
| 527 | + f"{cls.__name__} was declared without required '__model__' attribute" |
| 528 | + ) |
| 529 | + |
| 530 | + cls.__schema__ = cls.__create_schema_from_model__() |
| 531 | + cls.resolvers = cls.__get_resolvers__() |
| 532 | + |
| 533 | + @classmethod |
| 534 | + def __create_schema_from_model__(cls) -> str: |
| 535 | + ... # Your logic that creates GraphQL SDL from Django model |
| 536 | + |
| 537 | + @classmethod |
| 538 | + def __get_resolvers__(cls) -> Dict[str, GraphQLFieldResolver]: |
| 539 | + ... # Your logic that creates resolvers map from model and cls |
| 540 | + |
| 541 | + @classmethod |
| 542 | + def __bind_to_schema__(cls, schema): |
| 543 | + # Bind resolvers map to schema, called by `make_executable_schema` |
| 544 | + graphql_type = schema.type_map.get(cls.graphql_name) |
| 545 | + |
| 546 | + for field_name, field_resolver in cls.resolvers.items(): |
| 547 | + graphql_type.fields[field_name].resolve = field_resolver |
| 548 | +``` |
| 549 | + |
| 550 | + |
| 551 | +## `make_executable_schema` |
| 552 | + |
| 553 | +```python |
| 554 | +def make_executable_schema( |
| 555 | + *types: BaseType, |
| 556 | + merge_roots: bool = True, |
| 557 | +) -> GraphQLSchema: |
| 558 | + ... |
| 559 | +``` |
| 560 | + |
| 561 | +Utility function that takes args with types and creates executable schema. |
| 562 | + |
| 563 | + |
| 564 | +### `merge_roots: bool = True` |
| 565 | + |
| 566 | +If set to true (default), `make_executable_schema` will automatically merge multiple `Query`, `Mutation` and `Subscription` types instead of raising error. |
| 567 | + |
| 568 | +Final merged types fields will be ordered alphabetically: |
| 569 | + |
| 570 | +```python |
| 571 | +class YearType(ObjectType): |
| 572 | + __schema__ = """ |
| 573 | + type Query { |
| 574 | + year: Int! |
| 575 | + } |
| 576 | + """ |
| 577 | + |
| 578 | + @classmethod |
| 579 | + def resolve_year(*_): |
| 580 | + return 2022 |
| 581 | + |
| 582 | + |
| 583 | +class MonthType(ObjectType): |
| 584 | + __schema__ = """ |
| 585 | + type Query { |
| 586 | + month: Int! |
| 587 | + } |
| 588 | + """ |
| 589 | + |
| 590 | + @classmethod |
| 591 | + def resolve_month(*_): |
| 592 | + return 10 |
| 593 | + |
| 594 | + |
| 595 | +schema = make_executable_schema(YearType, MonthType) |
| 596 | + |
| 597 | +assert print_schema(schema) == """ |
| 598 | +type Query { |
| 599 | + month: Int! |
| 600 | + year: Int! |
| 601 | +} |
| 602 | +""" |
| 603 | +``` |
| 604 | + |
| 605 | +When `merge_roots=False` is explicitly set, `make_executable_schema` will raise an GraphQL error that `type Query` is defined more than once. |
| 606 | + |
| 607 | + |
| 608 | +## `convert_case` |
| 609 | + |
| 610 | +Utility function that can be used to automatically setup case conversion rules for types. |
| 611 | + |
| 612 | + |
| 613 | +#### Resolving fields values |
| 614 | + |
| 615 | +Use `__aliases__ = convert_case` to automatically set aliases for fields that convert case |
| 616 | + |
| 617 | +```python |
| 618 | +from ariadne_graphql_modules import ObjectType, convert_case, gql |
| 619 | + |
| 620 | + |
| 621 | +class UserType(ObjectType): |
| 622 | + __schema__ = gql( |
| 623 | + """ |
| 624 | + type User { |
| 625 | + id: ID! |
| 626 | + fullName: String! |
| 627 | + } |
| 628 | + """ |
| 629 | + ) |
| 630 | + __aliases__ = convert_case |
| 631 | +``` |
| 632 | + |
| 633 | + |
| 634 | +#### Converting fields arguments |
| 635 | + |
| 636 | +Use `__fields_args__ = convert_case` on type to automatically convert field arguments to python case in resolver kwargs: |
| 637 | + |
| 638 | +```python |
| 639 | +from ariadne_graphql_modules import MutationType, convert_case, gql |
| 640 | + |
| 641 | +from my_app import create_user |
| 642 | + |
| 643 | + |
| 644 | +class UserRegisterMutation(MutationType): |
| 645 | + __schema__ = gql( |
| 646 | + """ |
| 647 | + type Mutation { |
| 648 | + registerUser(fullName: String!, email: String!): Boolean! |
| 649 | + } |
| 650 | + """ |
| 651 | + ) |
| 652 | + __fields_args__ = convert_case |
| 653 | + |
| 654 | + async def resolve_mutation(*_, full_name: str, email: str): |
| 655 | + user = await create_user( |
| 656 | + full_name=full_name, |
| 657 | + email=email, |
| 658 | + ) |
| 659 | + return bool(user) |
| 660 | +``` |
| 661 | + |
| 662 | + |
| 663 | +#### Converting inputs fields |
| 664 | + |
| 665 | +Use `__args__ = convert_case` on type to automatically convert input fields to python case in resolver kwargs: |
| 666 | + |
| 667 | +```python |
| 668 | +from ariadne_graphql_modules import InputType, MutationType, convert_case, gql |
| 669 | + |
| 670 | +from my_app import create_user |
| 671 | + |
| 672 | + |
| 673 | +class UserRegisterInput(InputType): |
| 674 | + __schema__ = gql( |
| 675 | + """ |
| 676 | + input UserRegisterInput { |
| 677 | + fullName: String! |
| 678 | + email: String! |
| 679 | + } |
| 680 | + """ |
| 681 | + ) |
| 682 | + __args__ = convert_case |
| 683 | + |
| 684 | + |
| 685 | +class UserRegisterMutation(MutationType): |
| 686 | + __schema__ = gql( |
| 687 | + """ |
| 688 | + type Mutation { |
| 689 | + registerUser(input: UserRegisterInput!): Boolean! |
| 690 | + } |
| 691 | + """ |
| 692 | + ) |
| 693 | + __requires__ = [UserRegisterInput] |
| 694 | + |
| 695 | + async def resolve_mutation(*_, input: dict): |
| 696 | + user = await create_user( |
| 697 | + full_name=input["full_name"], |
| 698 | + email=input["email"], |
| 699 | + ) |
| 700 | + return bool(user) |
| 701 | +``` |
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