Question

我正在浏览中继文档并转到RANGE_ADD中的以下代码。

class IntroduceShipMutation extends Relay.Mutation {
  // This mutation declares a dependency on the faction
  // into which this ship is to be introduced.
  static fragments = {
    faction: () => Relay.QL`fragment on Faction { id }`,
  };
  // Introducing a ship will add it to a faction's fleet, so we
  // specify the faction's ships connection as part of the fat query.
  getFatQuery() {
    return Relay.QL`
      fragment on IntroduceShipPayload {
        faction { ships },
        newShipEdge,
      }
    `;
  }
  getConfigs() {
    return [{
      type: 'RANGE_ADD',
      parentName: 'faction',
      parentID: this.props.faction.id,
      connectionName: 'ships',
      edgeName: 'newShipEdge',  
      rangeBehaviors: {
        // When the ships connection is not under the influence
        // of any call, append the ship to the end of the connection
        '': 'append',
        // Prepend the ship, wherever the connection is sorted by age
        'orderby(newest)': 'prepend',
      },
    }];
  }
  /* ... */
}

现在在这里提到，为连接添加新节点需要edgeName。看起来很好。

现在，我进一步向下移动文档并实现此突变的GraphQL实现。

mutation AddBWingQuery($input: IntroduceShipInput!) {
  introduceShip(input: $input) {
    ship {
      id
      name
    }
    faction {
      name
    }
    clientMutationId
  }
}

现在根据文档，这个突变给我输出

{
  "introduceShip": {
    "ship": {
      "id": "U2hpcDo5",
      "name": "B-Wing"
    },
    "faction": {
      "name": "Alliance to Restore the Republic"
    },
    "clientMutationId": "abcde"
  }
}

我看不到edgeName在这里。

我在项目中使用石墨烯。在那里我也看到了类似的东西

class IntroduceShip(relay.ClientIDMutation):
  class Input:
    ship_name = graphene.String(required=True)
    faction_id = graphene.String(required=True)

ship = graphene.Field(Ship)
faction = graphene.Field(Faction)

@classmethod
def mutate_and_get_payload(cls, input, context, info):
    ship_name = input.get('ship_name')
    faction_id = input.get('faction_id')
    ship = create_ship(ship_name, faction_id)
    faction = get_faction(faction_id)
    return IntroduceShip(ship=ship, faction=faction)

在这里，我无法在任何地方看到edgeName。

请帮忙吗？我正在研究第一个突变，所以想确认一下我错过了什么或者这里有什么问题？

Answer 1

这个例子可能是简化的，也可能是有点阴影，因为在实践中需要返回边，这正是继电器提取的内容（RANGE_ADD中的其他字段更多是一种声明，不一定是取得的。）

以下是石墨烯的使用方法：

# Import valid as of graphene==0.10.2 and graphql-relay=0.4.4
from graphql_relay.connection.arrayconnection import offset_to_cursor

class IntroduceShip(relay.ClientIDMutation):
  class Input:
    ship_name = graphene.String(required=True)
    faction_id = graphene.String(required=True)

ship = graphene.Field(Ship)
faction = graphene.Field(Faction)
new_ship_edge = graphene.Field(Ship.get_edge_type().for_node(Ship))

@classmethod
def mutate_and_get_payload(cls, input, context, info):
    ship_name = input.get('ship_name')
    faction_id = input.get('faction_id')
    ship = create_ship(ship_name, faction_id)
    faction = get_faction(faction_id)

    ship_edge_type = Ship.get_edge_type().for_node(Ship)
    new_ship_edge = edge_type(
        # Assuming get_ships_number supplied
        cursor=offset_to_cursor(get_ships_number())
        node=ship
    )

    return IntroduceShip(ship=ship, faction=faction, new_ship_edge=new_ship_edge)

Relay Mutations中RANGE_ADD的问题

1 个答案: