How to mutate a relational field in graphql?

@darrion.kuhn 

In GraphQL, mutations are used to make changes to data on the server. To mutate a relational field in GraphQL, you will need to create a mutation that specifically targets the field you want to change.

Here is an example of how you might mutate a relational field in GraphQL:

1. Define a mutation in your schema that targets the specific field you want to mutate. For example, if you have a "User" type with a field "address", you might create a mutation like this:

1
2
3

type Mutation {
  updateUserAddress(userId: ID!, newAddress: String!): User
}

1. Implement the resolver for the mutation in your server code. This resolver will receive the userId and newAddress as arguments, and should update the corresponding user's address field in your data source. Here is an example of how you might implement this resolver in JavaScript:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12

const resolvers = {
  Mutation: {
    updateUserAddress: (parent, { userId, newAddress }, context) => {
      const updatedUser = context.users.find(user => user.id === userId)
      if (!updatedUser) {
        throw new Error("User not found")
      }
      updatedUser.address = newAddress
      return updatedUser
    }
  }
}

1. Use the mutation in your client code to make the change to the relational field. You would send a mutation query like this using a GraphQL client library or tool:

1
2
3
4
5
6

mutation {
  updateUserAddress(userId: 1, newAddress: "123 Main St") {
    id
    address
  }
}

This query would update the address field of the user with the ID of 1 to "123 Main St".