Fix where in array + dynamic limit and offset

[exAspArk]

Fixes #170

[coveralls]

Pull Request Test Coverage Report for Build 328

• 14 of 15 (93.33%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.1%) to 87.397%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/mongo_ecto/normalized_query.ex	14	15	93.33%

Totals
Change from base Build 324:	1.1%
Covered Lines:	319
Relevant Lines:	365

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💛 - Coveralls

[sourcelevel-bot]

Ebert has finished reviewing this Pull Request and has found:

• 1 possible new issue (including those that may have been commented here).

You can see more details about this review at https://ebertapp.io/github/ankhers/mongodb_ecto/pulls/171.

[sourcelevel-bot]

Use a function call when a pipeline is only one function long

[exAspArk]

OK, I'm at a point when I think that it all works incorrectly 😭 I wrote a more complicated test case and tried to make it work:

https://github.com/ankhers/mongodb_ecto/blob/2d195a33e4c2519b51ba37d003e836a72a880194/test/mongo_ecto_test.exs#L94-L113

It uses these params:

{
  3, # visits
  4, 5, # not in visits
  #BSON.ObjectId<5c4218d5ac013d8d6e5ecadc>, #BSON.ObjectId<5c4218d5ac013d8d6e5ecadd>, #BSON.ObjectId<5c4218d5ac013d8d6e5ecade>, # in ids
  1, # offset
  2 # limit
}
# ^ it could be much more simple it lists were not "flattened"

but generates this expression:

{:and, [],
     [
       {:and, [],
        [
          {:==, [],
           [{{:., [], [{:&, [], [0]}, :visits]}, [], []}, {:^, [], [0]}]},
          {:not, [],
           [
             {:in, [],
              [{{:., [], [{:&, [], [0]}, :visits]}, [], []}, {:^, [], [1, 2]}]}
           ]}
        ]},
       {:in, [], [{{:., [], [{:&, [], [0]}, :id]}, [], []}, {:^, [], [2, 3]}]}
       # ^ why it starts with 2 for a list of [#BSON.ObjectId, #BSON.ObjectId, #BSON.ObjectId]
     ]}

[exAspArk]

cc @ankhers @michalmuskala