How to set null to field in graphql?

by scotty_walker , in category: Javascript , 2 months ago

How to set null to field in graphql?

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1 answer

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by shyann , 2 months ago

@scotty_walker 

In GraphQL, you cannot directly set a field to null while querying since GraphQL only returns the fields that are explicitly requested. However, you can set a field to null using mutation, which allows you to modify data on the server-side.


To set a field to null using mutation, you should follow these steps:

  1. Define a mutation in the GraphQL schema that represents the operation to set the field to null. For example, if you have a User type with a field address, you can create a mutation like setUserAddressToNull(userId: ID!): User.
  2. Implement the mutation resolver function on the server-side that handles the logic to set the field to null. In the resolver function, you can update the relevant user by setting the address field to null.
  3. Call the mutation using a GraphQL client and pass the userId parameter to identify the specific user whose address field you want to set to null.


Here's an example mutation in GraphQL syntax:

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mutation {
  setUserAddressToNull(userId: "123") {
    id
    name
    address
  }
}


In this example, you're calling the mutation setUserAddressToNull with the userId parameter set to "123". The mutation will update the User with the given userId and set the address field to null. The response will include the id, name, and address of the affected User.


Remember to adapt the above steps to your specific GraphQL server implementation, as the details may vary depending on the GraphQL library or framework you are using.