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Editorial Team
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Asked: 2026-06-11T21:25:35+00:00

Let’s say you’re implementing a REST API in Rails. When serving a collection, you

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Let’s say you’re implementing a REST API in Rails. When serving a collection, you might want to only include a few attributes:

/people

But when serving a single resource, you want to include all the attributes:

/people/1

I don’t see how to do that using ActiveModel::Serializers, since the examples all use the pattern of defining one serializer per model (with a standard naming convention) and having AMS automatically use the right one in the controller when you do:

render json: @people

or:

render json: @person
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1 Answer

  1. Editorial Team

    To avoid mixing view concerns into your models (via serialized variations), use the view to render your JSON for each action, much like we do for HTML.

    jbuilder & rabl both fill this data templating need quite nicely.

    Update 2013-12-16: The ActiveModelSerializers library does support defining multiple serializers for one model, as @phaedryx answered later, by using custom serializers.

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