On Thursday, August 28, 2014 12:22:10 PM UTC-7, Paul Carew wrote:
>
> Hi
>
> Hopefully this is an easy one but one I've been puzzling over it for a
> while now...
>
> When including associations with the json_serializer is it possible to
> modify the association criteria?
>
> For example if I have:
>
> Episode.where(:user_id => user).to_json(:include => :colleagues)
>
> How might I go about including only those :colleagues that have a boolean
> column named "active" set to true?
>
> Using .join() I understandably get NoMethodErrors on the join columns
> when doing to_json, as there are no corresponding instance methods on
> Episode.
>
> Is there a way around this?
>
I'm not sure the API currently supports something like that. We could
expand the API with additional options to support it, but it's already a
fairly complex API. I suppose the natural way to handle it if we were to
expand the API would be:
Episode.where(:user_id => user).to_json(:include
=>{:colleagues=>{:callback=>proc{|ds| ds.where(:active)}}})
The problem is that is already valid and used to pass the :callback option
to the Colleague#to_json method.
You could have an active_colleagues association that just returns active
colleagues, but that's probably not going to give you the json you want
(using active_colleagues as the key instead of colleagues). We could
support an additional option like :key_name to work around that, but it has
the same issues as adding :callback.
For advanced use cases, you may be better off using a different tool, such
as rabl.
I'm open to feedback in terms of expanding json_serializer options, so if
anyone has opinions, please speak up.
Thanks,
Jeremy
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