add handling each_serializer when expose a collection of object.

[hlxwell]

For now in the controller if you run

expose User.page(params[:page]||1), serializer: UserSerializer

It will give you an error, if you add :each_serializer it doesn't work.

so add the option when :each_serializer was used, that means user want to regards the object as a collection.

[mbhnyc]

On this issue - i'm seeing serializers not working as well — am i alone on this??

NoMethodError - undefined method `read_attribute_for_serialization' for #<PortIn::ActiveRecord_AssociationRelation:0x007ff819c7af10>:
  activerecord (4.1.9) lib/active_record/relation/delegation.rb:136:in `method_missing'
  activerecord (4.1.9) lib/active_record/relation/delegation.rb:99:in `method_missing'
  active_model_serializers (0.9.0) lib/active_model/serializer.rb:101:in `block (2 levels) in attributes'
  active_model_serializers (0.9.0) lib/active_model/serializer.rb:155:in `block in attributes'
  active_model_serializers (0.9.0) lib/active_model/serializer.rb:154:in `attributes'
  active_model_serializers (0.9.0) lib/active_model/serializer.rb:260:in `serializable_object'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:10:in `serializable_hash'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:71:in `normalise_object'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:92:in `normalise_object'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:132:in `respond_with_object_and_type'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:143:in `collection'
  rocket_pants (1.10.0) lib/rocket_pants/controller/respondable.rb:157:in `exposes'

[mbhnyc]

For now, fixed with:

expose ActiveModel::ArraySerializer.new(@people, each_serializer: PersonSerializer)

[sevgibson]

You are not alone, @mbhnyc -- and the workaround precludes showing the pagination in the return data:

expose @people.paginate(:page => params[:page])

...
"count": 2,
"pagination": {
    "previous": null,
    "next": null,
    "current": 1,
    "per_page": 30,
    "count": 2,
    "pages": 1
}
...

[Sutto]

Hey guys - This isn't forgotten, I need to look back into it again but last time I worked on it I hit similar issues.

[Sutto]

fwiw, the easier solution for the moment is:

expose @people, serializer: ActiveModel::ArraySerializer, each_serializer: PersonSerializer

Which should handle pagination etc, child serializers and more. I'm looking at fixing this properly in a build (1.12 likely, if not that 1.13 in the near future) - but hit a few blockers last time I looked into it hence why it's not done yet.

Edit: If that above solution doesn't work, let me know and I'll work on fixing it properly.

[Sutto]

Can you guys take a look at the change on master? I've tested in a few places, and it appears to work - will release in 1.12 shortly (and add credit @hlxwell) - Sorry it's taken so dang long for me to get to this.