datamapper

what is attr_accessor in datamapper - ruby

由 心已入冬 提交于 2019-12-08 08:27:07
问题 I am a newby in datamapper. I saw this code in this forum. class User include DataMapper::Resource property :id, Serial property :email, String, :required => true, :unique => true, :format => :email_address, property :name, String property :hashed_password, String property :salt, String property :created_at, DateTime attr_accessor :password, :password_confirmation property would mean that it defines the field in the database table..what does attr_accessor means..is it kind of field in the

Using Datamapper with existing rails application

由 牧云@^-^@ 提交于 2019-12-08 07:24:26
问题 I have an existing Rails 3 application using ActiveRecord, and I want to switch to Datamapper. The instructions given in the dm-rails page only talk about creating a new application. Does anyone know how to throw away all activerecord dependancies and migrate to datamapper? Thanks! 回答1: It's realtively straightforward, but there are a couple of things you need to do. In your Gemfile, remove "rails" and instead require the following. gem 'activesupport', RAILS_VERSION, :require => 'active

nested forms for 2 models in rails using dm-accepts_nested_attributes and dm-is-tree

由 依然范特西╮ 提交于 2019-12-07 20:10:58
问题 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,

Heroku and Datamapper problems

由 我怕爱的太早我们不能终老 提交于 2019-12-07 14:11:40
问题 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

How to handle multidimensional output with (nested) lists using the Zend\Db\TableGateway with a mapper in Zend Framework 2?

由 筅森魡賤 提交于 2019-12-07 14:10:28
问题 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

DataMapper: Create new record or update existing

由 不打扰是莪最后的温柔 提交于 2019-12-07 05:08:21
问题 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 回答1: Foo.first_or_create(:id=>id).update(attributes) or (Foo.get(id) || Foo.new).update(attributes) 回答2: I just try Foo.first_or_create(:id=>id).update(attributes)

error happens when I try “all” method in datamapper

由 。_饼干妹妹 提交于 2019-12-07 01:54:08
问题 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, 回答1: Your getting this error because Sinatra takes the return value of a route and converts it into a string before

Is this the common structure for the domain mapper model?

由 南楼画角 提交于 2019-12-06 16:22:01
Hopefully i am asking this on the right stack exchange forum. If not please do let me know and I will ask somewhere else. I have also asked on Code Review, but the community seems a lot less active. As I have self learned PHP and all programming in general, I have only recently found out about 'Data Mappers' which allows data to be passed into classes without said classes knowing where the data comes from. I have read some of the positives of using mappers and why they make it 'easier' to perform upgrades later down the line, however I am really struggling to find out the reccomended way of

what is attr_accessor in datamapper - ruby

由 丶灬走出姿态 提交于 2019-12-06 15:46:05
I am a newby in datamapper. I saw this code in this forum. class User include DataMapper::Resource property :id, Serial property :email, String, :required => true, :unique => true, :format => :email_address, property :name, String property :hashed_password, String property :salt, String property :created_at, DateTime attr_accessor :password, :password_confirmation property would mean that it defines the field in the database table..what does attr_accessor means..is it kind of field in the model but not in the database.. thanks Yes, you are right. It is an attribute (a field) of your model, but

Can a Simple Model just Extend Zend_Db_Row (essentially Active Record)?

由 会有一股神秘感。 提交于 2019-12-06 15:02:58
问题 I know Domain Models and Data Mappers are the OOP snob's choice (using 'snob' in a complementary way, as Martin Fowler calls himself one) - however, even Fowler says in POEAA that "Active Record is a good choice for domain logic that isn't too complex..." I have a simple product and invoice domain model, not too many tables/objects/concepts to model, and the relationships aren't that overly complex. So, is this a good use case for Active Record? Fowler also states that Active Record is
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