MartinVolerich
JSON_API: How best to expose an aggreate value in a GET or READ endpoint
I’m still not 100% with my understanding of the JSON_API layers on Ash.
I’ve created an easy and working aggregate to count the number of related (to_many) records on a resource.
But… I’d like to insert that aggregate value into the JSON api response for gets & reads. I’m currently doing that using the previously learned metadata approach - but I’m curious whether there is a better way to do this.
While I’m at it… Are aggregates the best way to go or should I be using some other form of calculated attributes instead.
Thanks
Martin
Marked As Solved
zachdaniel
Ah, so metadata is not necessary for this.
You can use the fields query parameter to include public aggregates (i.e aggregates with public?: true. For example fields[type]=agg_name,other,fields. If you want the aggregate to be included by default, you can set default_fields on the route or the resource level, i.e
default_fields [:the, :list, :of, :fields, :agg_name]
That will make them appear as standard attributes in the response.
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MartinVolerich
That’s perfect. Many thanks. The trick (at least to me) was to make the aggregate public and to add it manually to he fields list - or fall back (with no fields list) to the default_fields list.
Thanks again. I’m slowly getting there - step by step.
Martin
Last Post!
MartinVolerich
That’s perfect. Many thanks. The trick (at least to me) was to make the aggregate public and to add it manually to he fields list - or fall back (with no fields list) to the default_fields list.
Thanks again. I’m slowly getting there - step by step.
Martin
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