Nested serializers: undefined method

[coderdave]

In following the readme to set up a nested serializer, I created this AccountSerializer:

require 'oat/adapters/hal'

class AccountSerializer < Oat::Serializer
  adapter Oat::Adapters::HAL

  schema do
    map_properties :id

    entity :tasks, item.tasks do |task, task_serializer|
      task_serializer.created_at task.created_at
    end
  end
end

However, I'm getting the following error when running AccountSerializer.new(Account.first).to_json
"undefined method 'created_at' for #<ActiveRecord::Associations::CollectionProxy []>"

Am I doing something wrong?

[ismasan]

Hi.

Yes, you should be using entities (plural) instead of entity (singular), because you're trying to render an array of tasks, not a single one.

So:

require 'oat/adapters/hal'

class AccountSerializer < Oat::Serializer
  adapter Oat::Adapters::HAL

  schema do
    map_properties :id

    entities :tasks, item.tasks do |task, task_serializer|
      task_serializer.created_at task.created_at
    end
  end
end

[coderdave]

Sorry, that was the debug version I pasted in. When I use entities, I get this error:
"NoMethodError: undefined method `created_at' for #<#Class:0x00000105e69208:0x00000105e68c40>"

There is a created_at on the Task model. What else could it be?

[coderdave]

The fix is to have another block for the serializer:

require 'oat/adapters/hal'

class AccountSerializer < Oat::Serializer
  adapter Oat::Adapters::HAL

  schema do
    map_properties :id

    entities :tasks, item.tasks do |task, task_serializer|
      task_serializer.properties do |props|
        props.created_at task.created_at
      end
    end
  end
end

[ismasan]

Yes. This should work to:

task_serializer.property :created_at, task.created_at