How to select data on one entity with OR operator in Mongo?

Question

MongoDB

Record the progress of users who received rewards and completed tasks in monga
Task 1: Show all users who
1. Received reward X and Reward Y
AND
2. Completed task X and task Y
Task 2: Show all users who
1. Received reward X or Reward Y
AND
2. Completed task X or task Y
Guess:
rewardId in (1) and rewardId in (2) and rewardId in (3) and taskId in (1)

Answer 1

Received an X Award or a Y Award

and it's still possible

Task 2: Show all users who
1. Received reward X or Award Y
AND
2. Completed task X or task Y

{$or : [{rewardId : 1}, {rewardId : 2}],
 $or: [ { taskId : { $eq: 1 } }, { taskId : { $eq: 2} }]
}

Logical operations , $or , $and , $where , mapReduce
Complex queries can also be done like this:

db.foo.find({$where : function() { 
  return (this.cost>5 && this.cost<10 )|| (this.is_hidden != 1) || (this.link == this.url);
}})

Source