Database
[{"_id":ObjectId("659d3cfb7a0f835f5cb468e3"),"Username":"bassem","FirstName":"Bassem","LastName":"Alameddine","Password":"bassem","isDeleted":false,"SendBirdId":"1","StatusText":".","ProfilePic":"bassem.png","Channels":[{"toUserId":ObjectId("659e9a027a0f835f5cb46901"),"url":"sendbird_group_channel_208215769_89dda4a153f20eca1707aa85973837e70fe2ea0b"},{"toUserId":ObjectId("659e9a027a0f835f5cb46901"),"url":""}]}]
Query
db.collection.update({_id:ObjectId("659d3cfb7a0f835f5cb468e3"),Channels:{$elemMatch:{toUserId:ObjectId("659e9a027a0f835f5cb46901"),"url":{$ne:""}}}},{$set:{"Channels.$[channel].url":"new_value"}},{arrayFilters:[{"channel.toUserId":ObjectId("659e9a027a0f835f5cb46901"),"channel.url":{$ne:""}}]})