Pre-loading with filter

[lukas-krecan]

Let's say I have the following schema

type Query {
  shows: [Show]
}

type Show {
  # The showId may or may not be there, depending on the scenario.
  showId: ID
  title: String
  reviews(filter: MyFilter): [Review]
}

type Review {
  starRating: Int
  text: String
}

I want to use pre-loading to fetch reviews in one DB query with shows as I can easily join it in the DB. Moreover implementing it effectively using DataLoaders is far from straightforward. The question is how to access the review filter MyFilter from the shows fetcher?

[lukas-krecan]

The closest we were able to get was to somehow use the ValuesResolver.literalToInternalValue and then DefaultInputObjectMapper to deserialize it.

[srinivasankavitha]

This needs to be fixed in the schema, i.e. if there is an input that needs to come the user, in this case the filter, you will need to update shows to take filter as input argument, i.e. ``` type Query { shows(filter: Filter) : [Show] } ``` If the filter is not provided by the user but will be available as part of processing the shows query, you can pass it down to child data fetchers using the local context. Check out an example here: https://netflix.github.io/dgs/advanced/context-passing/#no-showid-use-local-context You will need to get the local context from the data fetching environment in this case. Hope this helps.

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