How to filter data by channel in config file of sync gate way in Couchbase?

Question

I connected to sync gate way via Api ,but I don't know how to filter some data and use them in my laravel project.

Answer 1

You are not filtering by channel in the syncgateway config, the filtering is the outcome of the sync-function, but it is more of a passive result of attaching a channel to a document. I have no idea which version you are using because your question lacks it, however configuration is pretty straight forward.

you basically have 2 options of attaching a channel to a document, the second is overriding the first: 1. don't have any sync function in the config file and just rely on a "channels" property, that property will make the document sync to the appropriate channels. for example:

{ "name": "Duke", "lastName": "Nukem", "channels": ["DukeNukem","Duke"] }

2. Have a sync function in the config file: For the document: { "name": "Duke", "lastName": "Nukem" }

you might have that sync function that will do the same:

function(doc, oldDoc){
   if (doc.name && doc.lastName) {
        channel(doc.name);
        channel(doc.name + doc.lastName);
    }
}

please note that you will have to grant permission to the user to able to see a channel.

in the client side you would need that user with the permission, and if you are not filtering for a channel - you will get the docs whenever you sync.

please read more here

Answer 2

Here is a Swift example on the client side on how to use the "channels" to route data:

let manager = CBLManager()
let database = try! manager.databaseNamed(dbName)
let pull = self.database.createPullReplication(url)
// We need to sync channels 
pull.channels = ["somechannels"]
pull.start()

A concrete example on a Store management application, every documents belong to a Store would be saved with channels contain the storeID. On the client side, when syncing we will put the storeID inside channels so that the sync will get only the documents belong to that Store. (we are using the default sync function)

Note that, there are security concern that you need to take into consideration, read more here.