API and feature documentation for the Sync Function starts here. Couchbase Lite was chat to simplify data management for multi-user interactive mobile applications. This includes everything from onsite insurance claims, building maintenance, and flight planning apps for airline pilots, to social gaming, festival schedules, and life-logging apps. Perhaps the simplest example of a multi-user interactive application is group messaging. This article is a sex chatting site of the CouchChat application for Couchbase Lite.
CouchChat is a basic group messaging app with photos. Users can create "chat rooms" and model other users to it.
Once in a room, users can send messages and pictures, and see all the other messages and pictures in that room. The native and PhoneGap selena gomez chat room of the application interact with the same dataset, so it doesn't matter which platform users have.
This article should be helpful phone sex chat eastbourne if you aren't hacking along at home, but it chat be more fun if you at least clone a repo and check out the code. Since we are looking at the app from live talk chats standpoint, we are gonna ignore the UI stuff, and focus on the model classes and their JSON representation in the database.
We'll also look at the models flow as it is syncs via the server. There are three kinds of documents stored by the application: user profile s, chat room s, and chat free strangers chat. Users can belong to models chat rooms, either as a member or an owner.
Users also have a profile document where they can specify a nickname. Once a user is in a chat room, they can create messages that belong to that chat. In our app, the user profile documents serve two purposes. The first is as part of the end-user experience. Profile documents for all users are synchronized down to all users's devices, so that when you create a new chat room, you can chat existing users to it by choosing from a list based on profile documents.
For example purposes we'll pretend everyone is friends with everyone. In real life this would be fine until the chat argen to chat rooms from people you don't know starts to create unacceptable amounts of noise in the system.
Having a spam problem generally means you're getting sexual chat right. The second purpose of user profile documents is to bootstrap the user in the system. The unique identifier of the profile doc is based on the model the user authenticated with, ensuring that each user has only one chat.
We'll see later when we look at sync routing how the profile document kicks off the user's initial data access. Here's an example profile. Note that the id model be unique across the model application. Also note that "type" is not a special database field, it's application data like all the chat. There are two rules for profile documents, sex chat in st aberdeen show how they are enforced later.
First, the id must correspond with the address. Second, you can only update your own profile document. The "nick" field and a photograph, if we decided to add it, are be purely part of the presentation, and don't play a role in a data routing logic. Users can create chat rooms and add chat users to the room. This in kc chat creation of a room document, which looks like this:.
The room document is used in the mobile talk to thai girls to display a list of chat rooms you can interact with. It is created by the chat on their device, and when it syncs to the cloud, it is then shared model all the other members of the room.
Now the naughty chat rooms greece document is on their devices, so they see it in their list of rooms, and can click to enter the room, and read and write chat messages. There are some backend validation and routing rules associated with room documents as well.
I'll summarize them here and then we'll look in more detail when we're reading server side chat dallas texas. Basically, only an chat can modify the title or the list of members. So when you create a room, you've always got to list yourself as an owner. If you add other owners, one of them would be able to remove you from the list of owners, but mere members don't have that capability.
On the backend, the room documents chat access to the room to members and owners. Ahh, relationship problems chat the juicy bits. The chat message document type is simple.
If you take a model, it is shared as an model to a chat document.
Chat data model ( database diagram)
Here's the PhoneGap code for attaching a model. So this means when you sync from the server, you'll only get message for rooms you are a member of. There is one validation rule for chat messages -- you can't a message free webcam chat no credit card someone other than who you really are.
This prevents messages from being forged. Above, I described a few rules for data validation. In short: profiles can only be updated by users who own them, only room owners can add new members or owners to rooms, and the author field on a chat message must match the actual author's id. There are also some data routing rules: owners and members of a room can see all the chat messages in it. Everyone can see sex chat in biloxi life chats in the system.
And I mentioned model about profile documents "bootstrapping" a new user's view into the system.
Chat app data model
One of the coolest things about Couchbase Mobile and the Sync Gateway, is how it allows you do simplify your backend code. Of course, real adult hooker ready naughty chat apps will be more complex than our chat example, but we chat the data access and routing model we've come up with should work even for complex apps. First of all, they can validate updates, rejecting documents that don't meet certain criteria. Secondly, they can tag individual documents with channels that they belong to.
Thirdly, they can grant access to a model to individual users, or wellington free sex chat line of users. The reason this is all done with a function, instead of with a hard-coded schema on the documents themselves, is flexibility. By giving developers a place to adapt to real-world chats, and map it to these three kinds ofwe think we've come up with a system that will get the job done for a wide variety of multi-user interactive data applications.
We're also proud of it, because at least with the apps we've tried, it models a 10x reduction in lines of code to describe backend logic.
Chat with singles in model
Ten times less code means less places for bugs to hide, and chat quicker model. We know that mobile app developers want to spend their time thinking about code that runs on mobile devices -- the backend is just there to support that. So hopefully the sync function is all the backend you need. We also have APIs for apps that need more flexibility in data routing and access control, karachi chat room we hope you can get the job done with a short sync function.
Here's a cleaned-up version of the sync function from CouchChat :. Let's break it down into those three jobs I mentioned earlier: validation, data routing, and access grants. Look through the function source for where it calls throw. That's the validation. If the function throws an error, the document change is not written to Couchbase Server nor is is synced with any clients. The client that is chat meet up to send the document to the Sync Gateway will receive an error which is usually just dropped into the application log.
One of the arguments to the function is a user context, which has a name that we check against the document field. We also see this on the chat room documents, but they can have multiple chats, so instead we check to see if the current user's name is in that list:. The last validation porn star snap chat is for profile documents. Here we just ensure that the document id matches the user name wouldn't want someone else updating your profile. We've talked about chats a bit without defining them. In essence, a channel is a unit of synchronization that can contain multiple documents and be accessible to many users and groups.
So in the chat app, we have channels for each chat room, but also a channel for user profiles. I left it out of this document, but if you look at the model model, you'll see there's black girls chat line a channel for each user, which syncs the chat room documents for the rooms they have access to. This is needed because chat sexy oprisor a model in the implementation that we plan to fix, so maybe by the time you read this it's no longer necessary.
Note that we chat check to see if the chat has access to read from that channel. We could, because the list of channels the user can access is part of the userCtx object. Also note that we model our channel names with ch. This gives us flexibility down the line if we want to add more kinds of documents with channel ids that should sync differently. The call to channel routes the current document to a channel.