firestation | A simple configurable admin interface for Firebase | Frontend Framework library

i don't know what you are trying to do, but your above code javascript engines and runtime environments with yell at you.

and secondly [] literal can and will never be equal to another [] literal

choose in between this two

I was able to create an Ember Twiddle to find, recreate, and resolve my issue.

Short answer is that my custom serializer was dropping included during normalization. I was confusing the responsibilities between normalize() and normalizeResponse() and returning included from the wrong method.

I was trying to set the included property on the hash in normalize() (that's what you see in my question above). This approach was entirely wrong.

included should be present in the response from normalizeResponse(), if needed. So I (superfluously) had included in response(), but didn't have it where it was actually needed in normalizeResponse().

You should probably not be storing your area code data as CSV, because it is unnormalized and therefore will be hard to work with. That being said, MySQL has a function called FIND_IN_SET() which can check if a given value appears in a CSV string. Something like this should work: