How to return ActiveRecord Relation in GraphQL (Rails)?

Question

GraphQL queries are straight forward to define if you search for record e.g. by its id or exact value (in my case date).

My query should be returning not one ActiveRecord object but ActiveRecord Relation. How to define it to be consumable by GraphQL?

 field :file_data, !FileDataType, " Returns records based on given date: format 'yyyy-mm-dd hh:mm:ss'" do argument :created_on, !types.String, "format 'yyyy-mm-dd hh:mm:ss'" resolve -> (obj, args, context) do FileData.where("created_on > ?", args["created_on"]) end end

It works for one object: if I add to the relation 'last':

 FileData.where("created_on > ?", args["created_on"]).last

For many results I get an error in rails console:

NoMethodError (undefined method `attribute_name' [any defined & requested] for FileData::ActiveRecord_Relation:..>

I would appreciate any suggestion.

rmosolgo · Accepted Answer · 2017-02-11 16:49:32Z

5

Use a list type for returning multiple objects:

field :file_data, types[FileDataType] do ... end

types[...] defines a list type.

answered Feb 11, 2017 at 16:49

rmosolgo

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3 Comments

Katarzyna Over a year ago

Thank you so much! I was considering additional gem (graphql-ruby includes built-in connection support for Array, ActiveRecord::Relations, and Sequel::Datasets) but solution turned to be so simple!

Kyle Carlson Over a year ago

I had this same problem. My resolver returned all the records in the table, but my field definition didn't have [] around it. Much appreciated @rmosolgo

Rahul Gupta Over a year ago

i need to retrieve single record from the database could anyone please help me with syntax without using block. i am using this syntax field :method_name, [Types::ObjectType],etc

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