So, you've encountered an error message that says, "GraphQL error: Field type must be Input Type but got ". Don't worry, you're not alone! This error can be a bit confusing, but I'm here to help break it down for you. Let's dive into what this error message means and how you can fix it.
### Understanding the Error Message
When you see the error message, "Field type must be Input Type but got ", it typically means that you are trying to use a type that is not considered an input type in GraphQL. In GraphQL, input types are used when you want to pass data into a query or mutation, similar to how arguments work in a function.
### How to Fix It
To resolve this error, you need to make sure that the field type you are using is defined as an input type in your GraphQL schema. Here are a few steps you can take to address this issue:
1. Check Your Schema Definitions: Start by reviewing your schema definitions to identify the field causing the error. Look for the type definition of the field and make sure it is marked as an input type if it is supposed to be used as an input.
2. Update the Field Type: If you find that the field type is not defined as an input type, you'll need to update the type definition in your schema. Change the type to an input type by adding the `input` keyword before the type name.
3. Update Your Resolvers: After updating the schema, don't forget to update your resolvers to handle the new input type correctly. Make sure your resolvers are expecting the input data in the correct format and processing it accordingly.
4. Test Your Changes: Once you've made the necessary updates, run your application and test the affected queries or mutations to confirm that the error has been resolved. Ensure that the data is being passed and processed correctly.
### Example Scenario
Let's consider a simple example to illustrate how you can address this error. Suppose you have a GraphQL schema with a `User` type that includes a field called `updateUser`, which requires an input type called `UserInput`.
type User {
id: ID
name: String
}
input UserInput {
name: String
}If the `updateUser` mutation is expecting a `UserInput` but the `UserInput` type is missing or not defined as an input type, you may encounter the error message mentioned earlier. To fix this, ensure that `UserInput` is defined as an input type in your schema definitions.
### In Conclusion
By understanding the nature of the "Field type must be Input Type" error in GraphQL and following the steps outlined above, you can effectively troubleshoot and resolve this issue in your application. Remember to review your schema definitions, update the field types to input types, adjust your resolvers as needed, and test your changes thoroughly. Happy coding!