how to calculate connection fields

[reconbot]

Hi!

I've got a connection field Network.channels

type Network {
  channels(
    after: String
    before: String
    first: Int
    last: Int
  ): ChannelConnection!
}

type ChannelConnection {
  edges: [ChannelEdge!]!
  nodes: [Channel!]!
  pageInfo: PageInfo!
}

type ChannelEdge {
  cursor: String!
  node: Channel!
}

type Channel {
  id: String!
}

So Network.channels takes an argument first or last which tells us how many nodes or edges the ChannelConnection is going to have. I can't use the field based custom estimator because the args are on the parent field and I don't access to the args when I'm calculating in the ChannelConnection.nodes or ChannelConnection.edges.

Is there a way to work around this?

[ivome]

Is there a way to work around this?

You could implement the logic at the Network.channels and then multiply the number of requested nodes with the child complexity. (This is how we're doing this at Slicknode). If you need finer-grained estimates, you can add a custom estimator to the Network.channels field and then use the GraphQL FieldNode which is passed as the node to the estimator. That contains the complete sub-selection set and you can calculate any way you want. But the logic has to live at the channels field level. Hope that helps...