Question

我正在尝试在db中写入另一个表中的id我有一个属于所有者表的机器表。

型号：

class Machine < ActiveRecord::Base
  has_many :ipvfours, :dependent => :destroy
  belongs_to :owners
  accepts_nested_attributes_for :ipvfours
  #accepts_nested_attributes_for :owners

  # some check on fields
  validates_uniqueness_of :nom, :scope => :nom
  validates_length_of :nom, :within => 3..24
  #validates_length_of :role, :within => 3..15


  # return the value
  def to_s
    "#{nom},#{role}"
  end

class Owner < ActiveRecord::Base
  has_many :machines
  #accepts_nested_attributes_for :machines
  def name_owner
    "#{name}"
  end
end

表格中的_form信息中的

已正确显示，但我在创建期间出错：

_form

<p>
  <%= f_owner.label :owner %><br />
  <%= f_owner.collection_select :owner_id, Owner.find(:all), :id, :name, :prompt =>     "Select an owner"%>
</p>

我的创建控制器：

 def create
   @machine = Machine.new(params[:machine])
   respond_to do |format|
     if @machine.save
       flash[:notice] = 'Machine was successfully created.'
       format.html { redirect_to(@machine) }
       format.xml  { render :xml => @machine, :status => :created, :location => @machine }
     else
       format.html { render :action => "new" }
       format.xml  { render :xml => @machine.errors, :status => :unprocessable_entity }
     end
   end

端

我有错误：

NameError in MachinesController#create

uninitialized constant Machine::Owners

并且请求是：

 {"machine"=>{"nom"=>"fgj",
"owners"=>{"owner_id"=>"1"},
"role"=>"fgj",
"ipvfours_attributes"=>{"0"=>{"ip"=>"fgj"}}},
 "commit"=>"Create",
"authenticity_token"=>"/j6/yo0KedbArk5Rj0SKGwIvg39+IMzmO78l/Fa7lHY="}

虽然我认为它应该是这样的：

 {"machine"=>{"nom"=>"fgj",
"owner_id"=>{"owners"=>"1"},
"role"=>"fgj",
"ipvfours_attributes"=>{"0"=>{"ip"=>"fgj"}}},
"commit"=>"Create",
"authenticity_token"=>"/j6/yo0KedbArk5Rj0SKGwIvg39+IMzmO78l/Fa7lHY="}

但我经过了很多尝试后才知道。提前谢谢。

Answer 1

您的belongs_to关联指的是复数owners，应该是owner单数。一台机器只能属于一个所有者。

belongs_to :owner

组合列表无法在db中写入

1 个答案: