Raise a warning on adding duplicated resource

[asvetlov]

Now, add_route merges consequenced add_get(path, handler) and add_post(path, handler) calls but doesn't do it if a resource for other path is pushed in between calls.
Also, it doesn't merge the same resource but under different names.

Let's not change behavior but raise a user warning for such cases, most likely it is the result of silly mistake/misunderstanding.

[pposca]

What is the reason for merging only consequenced calls? I mean, if you have to detect non-consecutive calls or the same resource under different names to send a warning, why not just merge all cases?

[asvetlov]

Good question!

Consider the following:

[get('/{arg}', h1),
 post(r'/{num:\d+}', h2),
 post('/{arg}', h3)]

Looks weird (and sure it is).
But the example demonstrates the real problem.
By merging /{arg} handlers /{num:\d+} will be never called.

[pposca]

Of course, the order is important. I didn't realize it. Now, I understand it. I will have a look at it. Thanks.

[asvetlov]

Cool!