Add middleware from the outside

[thedarkside]

Hey everyone!

Currently iam working on a custom Railtie which wants to add a middleware to all mounted Grape::APIs in a Rails project in the Railties after_initialize block.
My first naive try was MyAPI.send(:insert_after, Rack::Head, MyMiddleware). It doesnt fail and MyAPI.middleware lists MyMiddleware but its not being called when requests come in. It just doesnt work.
So my understanding is that the mounted API is being instantiated before my addition runs and the change is not being picked up by the API.
Ive also experimented with MyAPI.compile! to kind of force a reload of the Grape API. This didnt succeed either. I have also realized that the instantiation process is not that easy to understand! Its quite complex.

What am i missing here?

[dblock]

Interesting. Update: I misunderstood the problem originally, updated my thoughts below.

Try calling MyAPI.compile, that returns and instance, while compile! ensures an instance on first call, but doesn't return it. Then insert_after on the result of compile?

If this doesn't work, put up a simple project that we can reproduce this in with a spec? Let's figure this out and document how to do this.

[thedarkside]

Thank you for the reply!
Ive tested it in my project but it just raises:

MyAPI.compile.insert_after Rack::Head, MyMiddleware

undefined method `insert_after' for #<#<Class:0x0000555ca092f430>:0x0000555ca0adcd00> (NoMethodError)

The same with .send.

Ill put up a project in the next days as you suggest. Lets work on it!