Database
db={articles:[{_id:"5faa889ade5e0a6326a873d3",name:"article 1"},{_id:"5faa889ade5e0a6326a873d",name:"article 2"}],bookmarks:[{_id:"5faa889ade5e0a6326a873d1",user_id:"5fc7b50da483a66a86aa7e9e",model_id:"5faa889ade5e0a6326a873d3"},{_id:"5faa889ade5e0a6326a873d1asd",user_id:"5fc7b50da483a66a86aa7e9e",model_id:"5faa889ade5e0a6326a873d3"}]}
Query
db.articles.aggregate([{$lookup:{from:"bookmarks",let:{article_id:"$_id"},pipeline:[{$match:{$expr:{$and:[{$eq:["$model_id","$$article_id"]},{$eq:["$user_id","5fc7b50da483a66a86aa7e9e"]}]}}}],as:"bookmarks"}}])