Building a Backend Application with Go/

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Modify the Resolver

Modify the Resolver

Learn how to modify the resolver in the GraphQL application.

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Implement the resolver

Inside the schema.resolvers.go file, we implement all the resolvers.

Register

First, we implement the resolver for the registration.

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func (r *mutationResolver) Register(ctx context.Context, input model.NewUser) (string, error) {
    // perform an user registration
    var token string = r.userService.Register(input)
    // if JWT token is empty, return an error
    if token == "" {
        return "", errors.New("registration failed")
    }
    // return JWT token
    return token, nil
}

Below is an explanation of the code above:

  • In line 3, the r.userService.Register(input) function performs user registration. This function returns the JWT token.

  • In line 11, if the registration succeeds, the JWT token is returned.

Login

We implement the resolver for the login.

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func (r *mutationResolver) Login(ctx context.Context, input model.LoginInput) (string, error) {

    // perform a login

    var token string = r.userService.Login(input)



    // if JWT token is empty, return an error

    if token == "" {

        return "", errors.New("login failed, invalid email or password")

    }



    // return JWT token

    return token, nil

}

Below is an explanation of the code above:

  • In line 3, the r.userService.Login(input) function performs a login for the registered user.

  • In line 11, if the login is successful, the JWT token is returned.

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