javascript - 如何处理中继突变中 Unresolved props？

Question

我创建了一个 Relay.Mutation ，它应该触发 User 对象的更新:

class UserMutation extends Relay.Mutation {
    public getMutation() {
        return Relay.QL`mutation {saveUser}`;
    }

    public getVariables() {
        return {
            id: this.props.user.id,
            loginName: this.props.user.loginName,
            firstName: this.props.user.firstName,
            lastName: this.props.user.lastName,
            mail: this.props.user.mail
        }
    }

    public getFatQuery() {
        return Relay.QL`
            fragment on UserPayload {
                user {
                    id,
                    loginName,
                    firstName,
                    lastName,
                    mail
                }
            }
        `;
    }

    public getConfigs() {
        return [{
            type: "FIELDS_CHANGE",
            fieldIDs: {
                user: this.props.user.id
            }
        }];
    }

    static fragments = {
        user: () => Relay.QL`
            fragment on User {
                id,
                // I initially had only id here
                loginName,
                firstName,
                lastName,
                mail
            }
        `
    }
}

我在我的组件 UserDetails 中使用此突变，如下所示:

// I initially passed this.props.user to the mutation
this.props.relay.commitUpdate(new UserMutation({ user: this.state.user })

执行时，relay 将 user 传递到后端，仅设置 id，没有任何其他属性。突变未执行，因为输入变量缺少其他字段。

调试突变后，我发现 this.props.user 已在除 id 之外的所有字段上设置 undefined。但是，this._unresolvedProps.user 是一个所有字段设置正确的用户。

当我更改突变的代码并将所有 this.props 替换为 this._unresolvedProps 时，所有必要的数据都会传输到后端，并且突变会在没有任何情况下执行任何错误。前端缓存似乎也正确更新(像 firstName 这样的字段在其他组件中更新)。但我不认为这是正确的方法。

我错过了什么？

更新

UserDetails 组件加载 loginName 等用户数据，并提供文本框来更改这些属性。对应的中继容器如下所示:

export default Relay.createContainer(UserDetails, {
    fragments: {
        user: () => Relay.QL`
            fragment on User {
                id,
                loginName,
                firstName,
                lastName,
                mail,
                roles {
                    id,
                    name
                },
                ${UserMutation.getFragment("user")}
            }
        `
    }
});

我在文本输入处理程序中处理文本框更改...

public handleTextInput(fieldName: string, event: any) {
    let user = this.state.user;

    switch (fieldName) {
        case "loginName": {
            user.loginName = event.target.value;
            break;
        }
        case "firstName": {
            user.firstName = event.target.value;
            break;
        }
        case "lastName": {
            user.lastName = event.target.value;
            break;
        }
        case "mail": {
            user.mail = event.target.value;
            break;
        }
    }

    this.setState({ user: user });
}

...并在提交处理程序中进行表单提交，我现在将 this.state.user 传递给突变:

public handleSubmit(e: any) {
    e.preventDefault();
    this.props.relay.commitUpdate(new UserMutation({ user: this.state.user }), {
        onSuccess: (response: any) => {
            this.setState({ user: response.saveUser.user });
        }
    });
}

我使用 C# 后端:graphql-dotnet 。这是我为突变定义的:

public class ApplicationSchema : Schema
{
    public ApplicationSchema()
    {
        this.Query = new ApplicationQuery();
        this.Mutation = new ApplicationMutation();
    }
}

public class ApplicationMutation : ObjectGraphType
{
    public ApplicationMutation()
    {
        this.Name = "Mutation";

        // save a user
        this.Field<UserPayloadType>(
            "saveUser",
             arguments: new QueryArguments(
             new QueryArgument<NonNullGraphType<UserInputType>>
             {
                 Name = "input",
                 Description = "the user that should be saved"
             }),
            resolve: context =>
                {
                    var userInput = context.Argument<UserInput>("input");
                    var clientMutationId = userInput.ClientMutationId;

                    var user = MemoryRepository.UpdateUser(new User()
                    {
                        Id = userInput.Id,
                        LoginName = userInput.LoginName,
                        FirstName = userInput.FirstName,
                        LastName = userInput.LastName,
                        Mail = userInput.Mail
                    });

                    return new UserPayload()
                    {
                        ClientMutationId = clientMutationId,
                        User = user
                    };
                });
    }
}

public class UserInputType : InputObjectGraphType
{
    public UserInputType()
    {
        this.Name = "UserInput";

        this.Field<NonNullGraphType<StringGraphType>>("id", "The id of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("loginName", "The login name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("firstName", "The first name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("lastName", "The last name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("mail", "The mail adress of the user.");

        this.Field<NonNullGraphType<StringGraphType>>("clientMutationId", "react-relay property.");
    }
}

public class UserPayloadType : ObjectGraphType
{
    public UserPayloadType()
    {
        this.Name = "UserPayload";

        this.Field<NonNullGraphType<UserType>>("user", "The user.");

        this.Field<NonNullGraphType<StringGraphType>>("clientMutationId", "react-relay property.");
    }
}

public class UserType : ObjectGraphType
{
    public UserType()
    {
        this.Name = "User";
        this.Field<NonNullGraphType<StringGraphType>>("id", "The id of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("loginName", "The login name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("firstName", "The first name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("lastName", "The last name of the user.");
        this.Field<NonNullGraphType<StringGraphType>>("mail", "The mail adress of the user.");

        Field<ListGraphType<RoleType>>("roles", resolve: context => MemoryRepository.GetRolesOfUser(context.Source as DomainModel.Models.User));
    }
}

Answer 1

您的 Relay 容器是否正确获取 User 片段？我在你的 staticfragments 定义片段中看到 User 上只有 id 字段，所以我想知道你的父 Relay 组件是否正在获取它们。

由于您的突变确实依赖于这些字段，因此请将它们添加到 fragments 属性中。

class UserMutation extends Relay.Mutation {
    public getMutation() { ... }

    // getVariables, FatQuery and Configs ...

    static fragments = {
      user: () => Relay.QL`
          fragment on User {
              id,
              loginName,
              firstName,
              lastName,
              mail
          }
      `
    }
}

然后尝试将此片段包含在 Relay 组件中，该组件使用您的突变。React-Relay 组件示例:

import UserMutation from 'mutations/user';

class User extends Component {
  commit(e) {
    Relay.Store.commitUpdate(
      new UserMutation({
        user: this.props.user
      })
    );
  }

  render() {
    return (
      <div>Hello</div>
    );
  }
};

export default Relay.createContainer(User, {
  fragments: {
    user: () => Relay.QL`
      fragment on User {
        ${UserMutation.getFragment('user')}
      }
    `,
  }
});