datamapper

I have two models: Post and Image in a forum application where Posts are arranged in parent-child format using dm-is-tree. Up this point, the images had been part of the Post model. As the Post model gets unwieldy and I need to add more depth to notating the image, I'm working to spin off the Image into its own model, but is still part of the post in output. So I started integrating dm-accepts_nested_attributes in a simple arrangement: class Post include DataMapper::Resource property :id, Serial property :istop, String property :created_at, DateTime property :updated_at, DateTime property

I'm developing a RESTful ZF2 based application and using a TableGateway implementation (subclass of the Zend\Db\TableGateway ) in combination with a simple mapper for the model, similar to the Album example of the ZF2 manual . Table class <?php namespace Courses\Model; use ... class CourseTable { protected $tableGateway; public function __construct(TableGateway $tableGateway) { $this->tableGateway = $tableGateway; } public function findOnceByID($id) { $select = new Select(); $where = new Where(); $select->columns(array( 'id', 'title', 'details', )); $select->from($this->tableGateway->getTable(

I can launch a basic app on Heroku, displaying a message with get '/'... works just fine. However, whenever I try to add sqlite with datamapper, the thing breaks down. In order to see my app structure, check out the project on github . I've kept the code pretty bare-bones. In the log from heroku I'm getting: 2011-06-26T21:28:36+00:00 app[web.1]: /app/.bundle/gems/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/adapters.rb:163:in `require': no such file to load -- dm-postgres-adapter (LoadError) The thing about this is that I'm not using postgres, so I'm confused why it is saying this. "The thing

Does DataMapper provide a convenient way to create a new record when none exists or update an existing one? I couldn't find anything in the API documentation. This is what I have at the moment which doesn't seem very elegant: foo = Foo.get(id) if foo.nil? foo = Foo.create(#attributes...) else foo.update(#attributes...) end foo.save Foo.first_or_create(:id=>id).update(attributes) or (Foo.get(id) || Foo.new).update(attributes) I just try Foo.first_or_create(:id=>id).update(attributes) but it gets wrong sometimes, so I find some tips from here: DataMapper Docs Now I make my code works like: Foo

When I try to do this in Sinatra, class Comment include DataMapper::Resource property :id, Serial property :body, Text property :created_at, DateTime end get '/show' do comment = Comment.all @comment.each do |comment| "#{comment.body}" end end It returns this error, ERROR: undefined method `bytesize' for #<Comment:0x13a2248> Could anyone point me to the right direction? Thanks, Luke Antins Your getting this error because Sinatra takes the return value of a route and converts it into a string before trying to display it to the client. I suggest you use a view/template to achieve your goal: #

I'm writing a simple app that takes standard input from the user. As for the email entry, I have it verify if it is in a standard email format and then have it list the problems like this when a new instance is going to be saved: u = User.new u.email = params[:email] u.save if u.save redirect '/' else u.errors.each do |e| puts e end end I know that if it is correct it should return back to the home page. If it is wrong I want it to return to the home page as well, but I want it to return an error value (so I can have a pop-up or just something onscreen letting the user know that the format of