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How to restrict user to create only certain number of document in a collection
How we can restrict user to upload only certain number of document in a collection
TL;DR
The user wants to restrict the number of documents a user can create in a collection. One solution is to use a function that validates and creates the document if the validation passes. This can be done using the Appwrite Functions feature. The user can query the list of documents using the list documents API to count the number of existing documents in the collection. By forcing users to execute a function instead of using the create document API, validation can be done before creating the document. 
Same as any other validation: use an Appwrite Function to do validation before creating/updating
is there is any other option?
except this
Nope. Functions are the way to go for any sort of custom behavior
example if you can provide, for how to restrict via function
The idea is instead of using the create document API, you would force users to execute a function. The function can do validation and only create the document if validation passes
yes you are right, but how do i know that how many documents is created previously or how will i count the document
You'll need a way to query for it using the list documents API
