When multiple conditions on the same field are given in separate method invocations, Mongoid uses `$and` to store the newer conditions, e.g.:
irb(main):012:0> Band.where(id: 1).and({year: {'$in' => [2020]}}, {year: {'$in' => [2021]}})
=>
#<Mongoid::Criteria
selector: {"_id"=>1, "year"=>{"$in"=>[2020]}, "$and"=>[{"year"=>{"$in"=>[2021]}}]}
options: {}
class: Band
embedded: false>
Here, there are two conditions on `year` and they are combined with `$and`.
When `where` is used and is given a field which already exists in the criteria with the same operator, and the criteria also already contains an `$and` clause, Mongoid uses `$and` to add the new condition from `where` but in doing so apparently clobbers the existing `$and` clause, as follows:
irb(main):014:0> Band.where(id: 1).and({year: {'$in' => [2020]}}, {year: {'$in' => [2021]}}).where(id: 2
)
=>
#<Mongoid::Criteria
selector: {"_id"=>1, "year"=>{"$in"=>[2020]}, "$and"=>[{"_id"=>2}]}
options: {}
class: Band
embedded: false>
--------------------------------
Original report:
I've met the problem that the later expression is overriding precedent other '$and' expressions if expressions are appeared in the specific oder like this:
# this is OK Band.where(id: 1).where(id: 2).selector => {"_id"=>1, "$and"=>[{"_id"=>2}]} # this is also OK Band.and({year: {'$in' => [2020]}}, {year: {'$in' => [2020]}}).selector => {"year"=>{"$in"=>[2020]}, "$and"=>[{"year"=>{"$in"=>[2020]}}]} # But this is bad, I think Band.where(id: 1).and({year: {'$in' => [2020]}}, {year: {'$in' => [2020]}}).where(id: 2).selector => {"_id"=>1, "year"=>{"$in"=>[2020]}, "$and"=>[{"_id"=>2}]}
- is cloned by
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MONGOID-5236 Add Feature Flag: Existing `$and` clause in query is overwritten by `where` condition
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- Closed
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- is duplicated by
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- Closed
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