Unexpected behavior when count is used with -

[solnic]

suppose a and b are collections return by finders on a class A:

suppose (a - b).count == 5

suppose we have a chained finder which returns only a subset of items of A:

(a - b).my_filter.count should be <= (a - b).count, but it is actually larger.

See the test case here:

https://gist.github.com/3569c20a3bf30f269699

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Created by Matt - 2010-11-13 02:18:34 UTC

Original Lighthouse ticket: http://datamapper.lighthouseapp.com/projects/20609/tickets/1446

[solnic]

Confirmed - I have this very issue. :-\

by mephux

[solnic]

I’ve slightly fixed the example script so it won’t give a false negative when the bug is fixed, and also to use a memory DB:

https://gist.github.com/7fd9e5fe4362dd325092

by Jonathan Stott (namelessjon)

[solnic]

I have a similar issue and created a test case for it here: https://gist.github.com/700986

by Robert Sköld

[solnic]

[bulk edit]

by Dan Kubb (dkubb)