Question

我正在尝试保存到sqlite 3数据库。我似乎无法保存，但不会抛出任何错误。我究竟做错了什么？我从我之前存在的一段有效的代码中取出了保存例程。关于我接下来应该尝试什么的任何想法？

require 'data_mapper'
require 'dm-migrations'

DataMapper.setup :default, "sqlite://#{Dir.pwd}/development.sqlite3"

class Post
  include DataMapper::Resource
  property :title,      String, :key => true # An auto-increment integer key
  property :slug_url,   String   
  property :desc,       String
  property :content,    String
  property :project,    String
  property :target_url, String
  property :trackback,  Boolean
  property :updated_at, String
  property :created_at, DateTime  # A DateTime, for any date you might like.
end

DataMapper.finalize
DataMapper.auto_upgrade!

post = Post.new
post.attributes = {:title => "Title",
                :slug_url => "Some-slug-url",
                :content => "content",
                :target_url => "http://example.com",
                :trackback => false
}
post.save

Answer 1

我不确定为什么这种方式有所不同，但我通过这样做得到了它：

require 'data_mapper'
require 'dm-migrations'

DataMapper.setup :default, "sqlite://#{Dir.pwd}/development.sqlite3"

class Post
  include DataMapper::Resource
  property :title,      String, :key => true # An auto-increment integer key
  property :slug_url,   String    # A varchar type string, for short strings
  property :desc,       String
  property :content,    String
  property :project,    String
  property :target_url, String
  property :trackback,  Boolean
  property :updated_at, DateTime
  property :created_at, DateTime  # A DateTime, for any date you might like.
end

DataMapper.finalize
DataMapper.auto_upgrade!

post = Post.new(:title => "Title",
                    :slug_url => "Some-slug-url",
                    :content => "content",
                    :target_url => "http://example.com",
                    :trackback => false)
post.save

Answer 2

可以使用DataMapper::Model.raise_on_save_failure = true修复“不会抛出任何错误”部分，DataMapper默认情况下不会保释。 #save!是不安全的版本（不知道为什么ActiveRecord对bang使用完全不同的语义）。 For further information, read here.

引发的第一个错误是column title is not unique (DataObjects::IntegrityError)。猜猜发生了什么; - ）

使用DataMapper保存数据

2 个答案: