Check that Field Exists with MongoDB

Question

So I m attempting to find all records who have a field set and isn t null   I try using  exists  however according to the MongoDB documentation  this query will return fields who equal null       exists does match documents that contain the field that stores the null value    So I m now assuming I ll have to do something like this   db collection find    fieldToCheck       exists   true   not   null        Whenever I try this however  I get the error  invalid use of  not   Anyone have an idea of how to query for this

User · Answer

i find that this works for me  db getCollection  collectionName   findOne   fieldName      ne  null

User · Answer

Use  ne  for  not equal    db collection find    fieldToCheck      exists  true   ne  null

User · Answer

Suppose we have a collection like below          id   1234     open   Yes     things                  paper  1234               bottle   Available                bottle count  40                    We want to know if the bottle field is present or not   Ans   db products find   things bottle     exists  true

User · Answer

db  lt COLLECTION NAME gt  find    quot  lt FIELD NAME gt  quot      exists  true   ne  null

[mongodb] Check that Field Exists with MongoDB

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