Well, this does not suites for my cases because I actually have object maps
like %Measurement{}. The problem comes when I need to pattern match its
attributes like id and others. Let me give you some context, but maybe I am
going through the wrong solution, though.
This code:
assert expected_measurement = measurement
would fail because association attributes in measurement are not loaded
Ecto.Association.NotLoaded (and they are supposed to)
So I selected the ones that I care, not simple the id, but to resume:
assert %Measurement{id: ^expected_measurement.id} = measurement
And this raise an error: cannot invoke remote function
expected_measurement.id/0 inside match
So I decided to use Map.take/2 on both maps checking a list of attributes
that I think that matters the most. The problem is that if one comes with
an attribute that does not exists, the tests will equally pass, so I
thought it would be good to have a Map.take!/2 function to help on that.
Em qui, 24 de mai de 2018 às 17:46, Peter Hamilton <[email protected]>
escreveu:
> Thanks for searching for an old thread rather than making a new one!
>
> > I pattern match just a few keys of my map objects
>
> Would just doing a direct pattern match work here?
>
> %{foo: foo, bar: bar} = my_map
>
> That would fail if foo or bar was missing in my_map.
>
> On Thu, May 24, 2018 at 1:11 PM Tallys Martins <[email protected]>
> wrote:
>
>> Hi!
>>
>> I could not find a final reply for this thread, here nor at Github, so I
>> am here to ask and argue why this would be a useful function.
>>
>> I am writing some tests where I pattern match just a few keys of my map
>> objects using Map.take. Developers could type invalid keys and the tests
>> would still pass.
>> If you are open to receive an implementation for this I can work on it
>> and give my first piece of contribution.
>>
>> Sorry for reviving something deep in the past if its already solved.
>>
>> Warm Regards,
>> Tallys Martins
>>
>>
>> Em quarta-feira, 30 de novembro de 2016 21:25:18 UTC-2, Aaron Tinio
>> escreveu:
>>>
>>> Map.take!(map, keys)
>>>
>>> Same as Map.take/2 but raises a KeyError when one of the keys doesn't
>>> exist.
>>>
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