HotChocolate Issue Reproduction

This repository demonstrates an issue when using [UseConnection] in combination with [UseProjection] in HotChocolate.

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🔁 1. Steps to Reproduce

1. Clone this repository
2. Launch the project (dotnet run)
3. Open GraphQL Playground or Studio
4. Run the following query:

query {
  countries(first: 5) {
    pageInfo {
      hasNextPage
      hasPreviousPage
      startCursor
      endCursor
      forwardCursors {
        page
        cursor
      }
      backwardCursors {
        page
        cursor
      }
    }
    nodes {
      id
      name
      emoji
      emojiU
      capital
      cities {
        name
        wikiDataId
      }
    }
    edges {
      cursor
    }
    totalCount
  }
}

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✅ 2. What is Expected?

The query should return:

• A paginated list of countries using relative cursors
• Associated child entities like cities
• Proper filtering, sorting, and projection applied
• No overfetching in the database (thanks to projection)

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❌ 3. What is Actually Happening?

• With [UseProjection] + [UseConnection], the application fails with:

  System.ArgumentException: Type 'HotChocolate.Types.Pagination.PageConnection`1[...]' does not have a default constructor (Parameter 'type')
  

• Without [UseProjection], the query works — but child entities like cities are not fetched, and full objects are retrieved from the database (overfetching).

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🙋‍♀️ Questions

• Is this a limitation by design?
• Is support for UseProjection with PageConnection<T> planned?
• Are there workarounds to get both relative cursors and projection?