Graphql-如何根据字段的条件获取结果？

Question

I have a query that look like this:

query MyQuery {
  products {
    edges {
      node {
        featured
        id
        image {
          altText
          mediaItemUrl
          slug
        }
        productId
        name
        onSale
        
      }
    }
  }
}

What I want is only fetch the result that featured field is true , if the featured is false, then it never shown in the result.

Something like query like below in mysql:

SELECT id,image,name, featured FROM products WHERE featured = 'false'

But in graphql query above, I can't query the featured = false.

I tried:

query MyQuery {
  products {
    edges {
      node {
        featured @include(if: false)
        id
        ... other field I need
        
      }
    }
  }
}

But what this query do is, if featured field is true, then included the featured field in the result, else don't included the field in the result.This is not what I want.

What I want is,

If featured field of a product is true , then include the products into the result, else, remove the whole product from the result.

How can I achieve this in the MyQuery above?

Answer 1

The @include and @skip directives are used for field selection, not filtering. GraphQL has no built-in way of doing filtering, sorting or pagination. It's up to each individual service to implement these features by exposing the appropriate arguments.

In this case, products could expose an argument named filter or isFeatured to add the ability to filter the results by the featured value. The field's resolver should then use that argument value to determine the correct value to return.

If you're writing client queries and consuming a schema you did not write, check your API's documentation to determine what arguments are available for the products field. If the schema doesn't expose this capability and you don't have a way to change it, then as a client you don't have many options. At best, you can handle the filtering yourself after the result is fetched, but this is troublesome if you also use pagination.