Serializer fails when used with class extending ActiveModel::Model

[chriskilding]

When I use AMS in my project, all 'real' AR models work fine with the serialisers, but there are 2 problems using it with a virtual model that inherits from ActiveModel::Model:

1. Controller does not use the AMS serialiser unless explicitly specified
   I have to specify it with render json: foo, serializer: FooSerializer... to make this work.
2. After serialiser is explicitly defined, using it fails with the following trace:

NoMethodError:
       undefined method `read_attribute_for_serialization' for #<Foo:0xblah>
     # (eval):3:in `_fast_attributes'
     # <controller that called `render json: foo...`>  

Using AMS v0.8.1 on Rails 4.0.2 / Jruby 1.7.9

Is this just a bug in the way I am using AMS, or does it not yet support virtual models?

[arthurnn]

You active model subclass needs to include this module, https://github.com/rails/rails/blob/c4fb191a4cc246db849f7acf31bd7edb4664cca5/activemodel/lib/active_model/serialization.rb , so probably adding a include ActiveModel::Serialization, will fix the issue.

[chriskilding]

That did the trick - could this be documented on the wiki / README?

Generally the assumption when you include ActiveModel::Model is that you get everything from AM, including serialisation support (partially true - you get as_json and to_json support, it just doesn't work with the AMS serialiser class), hence my mistake above, so it would be wise to warn other AM:M users about this.

[steveklabnik]

It's in the README.

[ZiaMM]

In version 0.09, I added the above Same error. Tried this line too:
include ActiveModel::Serializers::JSON
... same error.
Moved to Version 0.10 rc4, and now either of these seem to work. Sill doesn't work - likely due to different syntax needed for this version - but I can make this error appear and disappear with either of the above "include" options.

[bf4]

@ZiaMM Please open a new issue (and check the docs)