class Todo < DataMapper::Base
  property :todo, :text
  property :status, :string
  property :done, :boolean

  belongs_to :context
  belongs_to :category

  def to_s
    "#{status} #{todo} <#{context}> [#{category}] -- #{done.to_s}"
  end
end
Todo.table.create! unless Todo.table.exists?

class Category < DataMapper::Base
  property :name, :string

  has_many :todos
end
Category.table.create! unless Category.table.exists?

class Context < DataMapper::Base
  property :name, :string

  has_many :todos
end


# je crée mon model comme ceci: (todo est un hash que j'obtiens par une methode que je n'ai pas indiquer ici)

t = Todo.new({:status => todo[:status], :todo => todo[:todo], :done => false})
context = t.context.create :name => todo[:context]
category = t.category.create :name => todo[:category]
t.save