Data Schema
{ "_id" : ObjectId("60966503a06708c0a9d05b51"), "item" : "journal", "qty" : 25, "tags" : [ "blank", "red" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b52"), "item" : "notebook", "qty" : 50, "tags" : [ "red", "blank" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b53"), "item" : "paper", "qty" : 100, "tags" : [ "red", "blank", "plain" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b54"), "item" : "planner", "qty" : 75, "tags" : [ "blank", "red" ], "dim_cm" : [ 22.85, 30 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b55"), "item" : "postcard", "qty" : 45, "tags" : [ "blue" ], "dim_cm" : [ 10, 15.25 ] }
Query
1 - Fine by order
Suppose you would like to find the item which contains blank and red in the specified order, then you can write the queries like below.
db.items.find({tags:["blank","red"]})
// output
{ "_id" : ObjectId("60966503a06708c0a9d05b51"), "item" : "journal", "qty" : 25, "tags" : [ "blank", "red" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b54"), "item" : "planner", "qty" : 75, "tags" : [ "blank", "red" ], "dim_cm" : [ 22.85, 30 ] }
Note: Order of the query matters
If you have specified[red,blank]then you'll get only[red,blank]not[blank,red]
2 - Find without order
If you don't want the exact order then you can use $all operator of MongoDB.
db.items.find({tags:{$all:["red"]}})
// output
{ "_id" : ObjectId("60966503a06708c0a9d05b51"), "item" : "journal", "qty" : 25, "tags" : [ "blank", "red" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b52"), "item" : "notebook", "qty" : 50, "tags" : [ "red", "blank" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b53"), "item" : "paper", "qty" : 100, "tags" : [ "red", "blank", "plain" ], "dim_cm" : [ 14, 21 ] }
{ "_id" : ObjectId("60966503a06708c0a9d05b54"), "item" : "planner", "qty" : 75, "tags" : [ "blank", "red" ], "dim_cm" : [ 22.85, 30 ] }
3 - Check for single element
You can directly provide string in the query parameter.
db.items.find({tags:"red"})
Find all items which contain red as an element, anywhere in the array.
3 - Check for single (Conditionally)
You can provide operators for the conditionality check
db.items.find({dim_cm:{$gt:21,$lt:50}})
The above query will find all items, which has any element inside dim_cm array which is less than 50 and greater than 21.
Explore
You can explore more here https://docs.mongodb.com/manual/tutorial/query-arrays/
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