Cant get variables to work

[stigi]

Hi,

I'm running a very simple query with a variable, but when execute the schema I get an error that the variable isn't declared, but I pass it in a Hash.

[1] pry(#<Cruise::App>)> query_variables
=> {"channel_id"=>"1"}
[2] pry(#<Cruise::App>)> query_string
=> "{\n channel(id:$channel_id) {\n  id\n }\n}"
[3] pry(#<Cruise::App>)> Schema.execute(query_string, variables: query_variables)
=> {"errors"=>[{"message"=>"Variable $channel_id is used by  but not declared", "locations"=>[{"line"=>2, "column"=>13}]}]}
[4] pry(#<Cruise::App>)> GraphQL::VERSION
=> "0.17.2"

For completeness sake here's my action code. The query comes from a graphiql instance I've set up myself (possible source of errors, but the values arriving in ruby do look ok).

post :index do
  query_string = params['query'] || ""
  query_variables_string = params['variables']
  query_variables = query_variables_string ? JSON.parse(query_variables_string) : {}
  content_type :json
  Schema.execute(query_string, variables: query_variables).to_json
end

Am I doing anything obviously wrong here which I'm to blind to see? What's a good way to further debug this?

Thanks

[stigi]

Figured out the issue. Had to pass the variable in the query. With an updated query it worked:

query($channel_id: ID!) {
 channel(id: $channel_id) {
   id
 }
}