Gatsby: Is there a way to get the count/length of an array instead of the array with content?

[supermoos]

I'm running a graphql query on contentful data, like so:

query test {
  allContentfulCategory(limit: 1000) {
    totalCount
    edges {
      node {
        categoryName
        contentful_id
        event {
          id
        }
      }
    }
  }
}

but instead of

        event {
          id
        }

which returns an array of id's
I would like something like this:

        event {
          totalCount
        }

to just get the length (i.e. amount of event's) and not an actual array of data.

Is there a way to do this?

[supermoos]

Could I implement this as a custom gatsbyjs-transform-plugin of some kind? Any pointers on that?

[krismorf]

Since you are already querying event id you can get the length of each node.

{data.allContentfulCategory.edges.map(({ node }) => {
    return (
      <div>
        <p>{node.categoryName}</p>
        <p>{node.event.length}</p>
      </div>
    )
})}

[supermoos]

Sorry if my initial post wasn't clear, I would like to be able to do it the graphql query or somewhere other than the js layer, since I don't need the id's in the client, I just need the length only - seems like it's not an easy thing to do in graphql.

[supermoos]

Okay, reformulating the question? Is it possible to write a gatsby plugin (maybe a transformer) that can be run on any [array] graphql results?

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[anton6]

@supermoos have you found a way to do this?