How to Add Default Values to Input Arguments In Graphql?

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In GraphQL, you can add default values to input arguments by using the "defaultValue" property in the argument definition. This property allows you to define a default value that will be used if the argument is not provided in the query or mutation.


For example, if you have an argument called "limit" with a default value of 10, you can define it in the schema like this:

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type Query {
  getUsers(limit: Int = 10): [User]
}


In the above example, if the "limit" argument is not provided in the query, it will default to 10. This way, you can ensure that your queries work even if certain arguments are not provided by the client.


Adding default values to input arguments can help make your schema more robust and user-friendly, as it reduces the likelihood of errors and provides a fallback option in case of missing arguments.

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What is the difference between setting default values at the schema level versus the resolver level in GraphQL?

Setting default values at the schema level in GraphQL means defining default values for certain fields directly within the schema definition itself. This allows the default value to be returned when a specific field is not explicitly provided in a query.


On the other hand, setting default values at the resolver level in GraphQL means defining default values within the resolver functions that are responsible for fetching the data for a specific field. This allows more granular control over when and how default values are returned for specific fields.


Overall, setting default values at the schema level provides a more centralized and consistent approach to handling default values for fields, while setting default values at the resolver level allows for more flexibility and customization on a per-field basis.


How to define default values for input arguments in a GraphQL schema?

In a GraphQL schema, default values for input arguments can be defined in the argument definition within the schema using the defaultValue key.


For example, consider a GraphQL schema with a query that takes an optional argument limit, with a default value of 10:

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type Query {
  posts(limit: Int = 10): [Post]
}


In this example, the limit argument has a default value of 10. If the argument is not provided in the query, the default value of 10 will be used.


When defining default values for input arguments in a GraphQL schema, it is important to consider the type of the input argument and provide a default value that is compatible with the specified type. Default values should also be appropriate for the context of the query or mutation being defined.


What is the best way to handle default values for input arguments when implementing pagination in GraphQL?

One approach to handling default values for input arguments in pagination in GraphQL is to set default values directly in the schema definition for the pagination arguments. This way, if the client does not provide any arguments for pagination, the default values will be used.


For example, in the schema definition for a users query with pagination, you can set default values for first and after arguments:

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type Query {
  users(first: Int = 10, after: String = null): [User]
}


In the resolver function for the users query, you can then check if the first and after arguments are provided by the client. If not, you can use the default values specified in the schema:

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users: async (parent, args) => {
  const { first, after } = args;
  
  // Use default values if arguments are not provided
  const limit = first || 10;
  const cursor = after || null;

  // Perform pagination logic using limit and cursor
  // Return paginated list of users
}


By setting default values in the schema and handling them in the resolver function, you can ensure that pagination works seamlessly even if the client does not provide explicit values for pagination arguments.

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