at least one match in list quering

Question

I have a list of items to search:
a = [1,2,3,4,5,6]
and documents in mongo:
doc1 = { a: [1,2] }
doc2 = { a:[3] }
doc3 = { a:[9,10] }
doc4 = { a:[1,10] }

I need to query all documents where at least one parameter match

doc1,doc2,doc4 is ok and doc3 is not

Is it possible?

Answer 1

In MongoDB shell you can retrieve the documents that match with

db.doc.find({"a":{"$in":[1,2,3,4,5,6]}})
{ "_id" : ObjectId("4e8eda300b92a26e01f4bc2f"), "a" : [ 1, 2 ] }
{ "_id" : ObjectId("4e8eda330b92a26e01f4bc30"), "a" : [ 3 ] }
{ "_id" : ObjectId("4e8eda3c0b92a26e01f4bc32"), "a" : [ 1, 10 ] }

when your collection seems like:

db.doc.find()
{ "_id" : ObjectId("4e8eda300b92a26e01f4bc2f"), "a" : [ 1, 2 ] }
{ "_id" : ObjectId("4e8eda330b92a26e01f4bc30"), "a" : [ 3 ] }
{ "_id" : ObjectId("4e8eda370b92a26e01f4bc31"), "a" : [ 9, 10 ] }
{ "_id" : ObjectId("4e8eda3c0b92a26e01f4bc32"), "a" : [ 1, 10 ] }