I love the DSL of jbuilder, but Skylight is telling me that one of my .jbuilder files has a response time of 2.6s with 1,145,441 allocations. It's by far the most rate-limiting step of my most popular API endpoint.
What exactly is jbuilder doing that causes it to be this slow and resource intensive in comparison to other json serialization libraries (e.g. fast-jsonapi etc)? I've gone through my own code looking for slow points (e.g. n+1 queries, etc) and have found none, so it seems to be a purely jbuilder issue.
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Change that to the following and you should be fine. Basically we just want to do the query in the controller and give the variable a better name. Then Rails will know to render index.json.jbuilder when the request comes in with .json at the end.
I found some workarounds that let you render jbuilder views from a model. There is no approach that I feel great about.
see: partial! not working in Jbuilder.encode blockĀ Issue #84Ā rails/jbuilderĀ GitHub
By default rails looks for a template of the requested format. For rendering response to JSON query we will need a template. We make a template called index.json.jbuilder in the views/api/v1/aricles directory. This file contains the logic for populating the nested attributes of the article model(eg: user). Here we have namespaced the directory because I think its better to have a clear seperation of our APIs.
In the index.json.jbuider add the following lines:
In the above lines, we are defining a key in json called articles and we are taking the array @articles that we made in the articles controller and we are iterating over each article of the array and rendering a partial with an object "obj" containing the article details. Partial rendering is one of the plus points of using jbuilder. 0852c4b9a8
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