Filter on null or "Not exists" for graphql fields

Is your feature request related to a problem? Please describe.

I can’t filter on whether or not a field is null or “not exists”

Describe the solution you’d like

There are a couple ways of solving this, but the easiest solution I can think of is to allow this:

    const filter: ModelFooFilterInput = {
      field: { eq: null }
    };
    const results: ListFoosQuery = await this.apiService.ListStudyFoos(filter);

[SwaySway]

@malcomm I believe the filter you might be looking for in this scenario is if the attribute does not exist on the given record. Given this schema

type Restaurant @model {
  id: ID!
  name: String!
  description: String!
  city: String!
}

If I wanted to filter by Restaurants that did not have a description then I would filter as follows:

const service = new APIService();
const filter: ModelRestaurantFilterInput = {
    description: { attributeExists: false }
  };
const results: ListRestaurantsQuery = await service.ListRestaurants(filter);

If can also or them in the filter so it returns the field being null or the attribute not existing

const filter: ModelRestaurantFilterInput = {
    or: [
      { description: { attributeExists: false } },
      { description: { eq: null } }
    ]
  }

[github-actions[bot]]

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