Find and load from array only specific data

Working with Data
1

Hello, i have 2 arrays - example:

array1 = [ 'one', 'two', 'three', 'four', 'five', 'six', 'seven' ]
array2 = [ '1', '2', '3', '4', '5', '6', '7' ]

i need load not all array, only that i need - Example only - two or 4

Try

    $match : { 
         $or: [ { array1 : { $elemMatch: { $eq: 'two' } } }, { array2 : { $elemMatch: { $eq: '4' } } } ]
     }

How i can do it?

2

you can try $filter i think it would solve your problem.

3

if the array has a million records, I want to reduce the load

4

Having

is a bad design decision. Please see https://www.mongodb.com/article/schema-design-anti-pattern-massive-arrays.

But, indeed as mentioned by @Abhishek_Dhadwal, you should also look at https://docs.mongodb.com/manual/reference/operator/aggregation/filter/ if reworking your schema is out of the question.

1 Like
5

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