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Apollo Graphql Schema拼接冲突

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我有关于GraphQL Schema拼接的问题 . 我有两个Graphql架构：

type Name {
   firstname: String!
   lastname: String!
}

type Address {
   street: String!
   number: Int!
}

type User {
   name: Name!
   address: Address!
}

type Query {
   user(userId: String!): User
}

和

type User {
   age: String!
}

type Query {
   user(userId: String!): User
}

我现在尝试使用graphql-tools的 mergeSchemas 函数合并模式：

const schema = mergeSchemas({
   schemas: [schema1, schema2]
});

但不是我想要实现的（扩展的用户类型）：

type Name {
   firstname: String!
   lastname: String!
}

type Address {
   street: String!
   number: Int!
}

type User {
   name: Name!
   address: Address!
   age: String!
}

type Query {
   user(userId: String!): User
}

它导致了这个：类型名称{firstname：String！姓氏：字符串！ }

type Address {
   street: String!
   number: Int!
}

type User {
   name: Name!
   address: Address!
}

type Query {
   user(userId: String!): User
}

最终架构中只显示一个UserTypes . 我尝试使用 mergeSchemas 中的 onTypeConflict API扩展Type但我没有取得任何结果 .

有没有办法通过扩展冲突类型来合并Schemas？

javascript node.js graphql apollo

2 回答

  • 1

    这是合并对象类型的可能解决方案 . 也许有必要在 onTypeConflict 中按类型名称进行过滤，而不是合并每种类型 .

    import cloneDeep from 'lodash.clonedeep'
import { GraphQLObjectType } from 'graphql/type/definition'
import { mergeSchemas } from 'graphql-tools'

function mergeObjectTypes (leftType, rightType) {
  if (!rightType) {
    return leftType
  }
  if (leftType.constructor.name !== rightType.constructor.name) {
    throw new TypeError(`Cannot merge with different base type. this: ${leftType.constructor.name}, other: ${rightType.constructor.name}.`)
  }
  const mergedType = cloneDeep(leftType)
  mergedType.getFields() // Populate _fields
  for (const [key, value] of Object.entries(rightType.getFields())) {
    mergedType._fields[key] = value
  }
  if (leftType instanceof GraphQLObjectType) {
    mergedType._interfaces = Array.from(new Set(leftType.getInterfaces().concat(rightType.getInterfaces())))
  }
  return mergedType
}

const schema = mergeSchemas({
  schemas: [schema1, schema2],
  onTypeConflict: (leftType, rightType) => {
    if (leftType instanceof GraphQLObjectType) {
      return mergeObjectTypes(leftType, rightType)
    }
    return leftType
  }
})

    致谢：mergeObjectTypes功能由Jared Wolinsky编写 .

    回复于
  • 1

    这应该有所帮助

    extend type User {
   age: String!
}
    回复于

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