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An Active Record pattern for your Parse models on RubyMotion.

branch: master
README.md

About

ParseModel provides an Active Record pattern to your Parse models on RubyMotion.

I'm using ParseModel internally for a project, slowly but surely making it much, much better. When the project is near completion, I'm going to extract additional functionality into the gem.

Expect a much more Ruby-esque API that still leaves full access to all of the features in the Parse iOS SDK. I'm not trying to re-implement features from the Parse iOS SDK, I just want to make them easier to use. Moreover, you should be able to rely on Parse's iOS docs when using ParseModel.

If you have any questions or suggestions, email me.

Usage

Create a model:

class Post
  include ParseModel::Model

  fields :title, :body, :author
end

Create an instance:

p = Post.new
p.title = "Why RubyMotion Is Better Than Objective-C"
p.author = "Josh Symonds"
p.body = "trololol"

ParseModel::Model objects will respond_to? to all methods available to PFObject in the Parse iOS SDK. You can also access the PFObject instance directly with, you guessed it, ParseModel::Model#PFObject.

Saving objects

p = Post.new
p.author = "Alan"

# save using main thread (blocking)
p.save

# save eventually (non-blocking)
p.saveEventually

# save in background with a block
p.saveInBackgroundWithBlock(lambda do |success, error|
  # do something...
end)

New: Cloud Code functions

# with block:
ParseModel::Cloud.callFunction("myFunction", {"myParam" => "myValue"}) do |result, error|
  # do something...
end

# without block:
ParseModel::Cloud.callFunction("myFunction", {"myParam" => "myValue"})

Cloud Code Examples

Parse.Cloud.define('trivial', function(request, response) {
  response.success(request.params);
});
ParseModel::Cloud.callFunction("trivial", {"foo" => "bar"})
#=> {"foo"=>"bar"}
// implementation of random queries using Parse Cloud Code
// see https://parse.com/questions/random-search-its-possibile for setup details

Parse.Cloud.define('randomNouns', function(request, response) {
  var NounMaster = Parse.Object.extend("NounMaster");
  var maxQuery = new Parse.Query(NounMaster);
  maxQuery.first({
    success: function(object) {
      var max = object.get("nextWordIndex");
      var n = 10;
      if(request.params.count) { n = request.params.count; }
      var arr = [];
      while (arr.length < n) {
        arr.push(Math.ceil(Math.random() * max));
      }
      var indexes = arr;
      var Noun = Parse.Object.extend("Noun");
      var nounQuery = new Parse.Query(Noun);
      nounQuery.containedIn("index", indexes);
      nounQuery.find({
        success: function(results) { 
          response.success(results); 
        }
      });
    }
  });
});
ParseModel::Cloud.callFunction("randomNouns", {"count" => 3})
#=> [#<PFObject:0x9620ee0>, #<PFObject:0x9629430>, #<PFObject:0x9629cd0>]

Users

class User
  include ParseModel::User
end

user = User.new
user.username = "adelevie"
user.email = "adelevie@gmail.com"
user.password = "foobar"
user.signUp

Querying the User class requires a special PFQuery object.

userQuery = User.query
#=> #<PFQuery:0xb087810>
userQuery.whereKey("email", equalTo:"bill@ms.com")
userQuery.findObjects
#=> [#<PFUser:0xafeae40>]

The User.all method simply runs a query with no conditions, and returns an array of User objects.

users = User.all
#=> [#<User:0xb4d5680 @PFUser=#<PFUser:0xb0dcad0>>]

For additional details on User query methods, see: https://parse.com/docs/ios_guide#users-querying/iOS

ParseModel::User delegates to PFUser in a very similar fashion as ParseModel::Model delegates to PFOBject.

Current User

if User.current_user
  @user = User.current_user
end

Queries

Parse provides some great ways to query for objects: in the current blocking thread (PFQuery#findObjects, or in the background with a block (PFQuery#findObjectsInBackGroundWithBlock()).

These method names are a little long and verbose for my taste, so I added a little but of syntactic sugar:

query = Post.query #=> <ParseModel::Query> ... this is a subclass of PFQuery
query.whereKey("author", equalTo:"Alan")
query.find # finds objects in the main thread, like PFQuery#findObjects

# Or run the query in a background thread

query.find do |objects, error|
  puts "You have #{objects.length} objects of class #{objects.first.class}."
end

By passing a two-argument block to ParseModel::Query#find(&block), the query will automatically run in the background, with the code from the given block executing on completion.

Also note that ParseModel::Query#find and ParseModel::Query#find(&block) return ParseModel::Model objects, and not PFObjects.

Because I want Parse's documentation to be as relevant as possible, here's how I'm matching up ParseModel::Query's convenience methods to PFQuery:

ParseModel::Query method Equivalent PFQuery method
ParseModel::Query#find PFQuery#findObjects
ParseModel::Query#find(&block) PFQuery#findObjectsInBackgroundWithBlock
ParseModel::Query#getFirst PFQuery#getFirstObject
ParseModel::Query#get(id) PFQuery#getObjectWithId
ParseModel::Query#get(id, &block) PFQuery#getObjectInBackgroundWithId:block:
ParseModel::Query#count PFQuery#countObjects
ParseModel::Query#count(&block) PFQuery#countObjectsInBackgroundWithBlock

Essentially, I'm omitting the words "object" and "InBackgroundWithBlock" from ParseModel's method signatures. I think it's a reasonable assumption that it can simply be implied that we're dealing with "objects." If I'm passing a block, it's repetitive to declare that I'm passing a block.

Installation

Either gem install ParseModel then require 'ParseModel' in your Rakefile, OR gem "ParseModel" in your Gemfile. (Instructions for Bundler setup with Rubymotion)

Somewhere in your code, such as app/app_delegate.rb set your API keys:

Parse.setApplicationId("1234567890", clientKey:"abcdefghijk")

To install the Parse iOS SDK in your RubyMotion project, add the Parse iOS SDK to your vendor folder, then add the following to your Rakefile:

  app.libs << '/usr/lib/libz.1.1.3.dylib'
  app.libs << '/usr/lib/libsqlite3.dylib'
  app.frameworks += [
    'AudioToolbox',
    'CFNetwork',
    'CoreGraphics',
    'CoreLocation',
    'MobileCoreServices',
    'QuartzCore',
    'Security',
    'StoreKit',
    'SystemConfiguration']

  # in case app.deployment_target < '6.0'
  app.weak_frameworks += [
    'Accounts',
    'AdSupport',
    'Social']

  app.vendor_project('vendor/Parse.framework', :static,
    :products => ['Parse'],
    :headers_dir => 'Headers')

More info on installation: this and this.

License

See LICENSE.txt

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