模型不连接，因为我认为他们应该是

Question

为什么我得到这个错误_form的选择内部出价？

=> undefined method `request_for_proposal' for 
# <ActionView::Helpers::FormBuilder:0x002aaad671c9c8> 

request_for_proposal 的has_many投标
投标belongs_to的 request_for_proposal

==================================================== 
Inside views/bids/_form.html.erb 

    <div class="field"> 
    <%= bid.label :vendor_name %> 
    <%= bid.select :vendor_id, bid.request_for_proposal.vendors.collect { |rfpvi| 
     [rfpvi.friendly_name + " : " + rfpvi.rfp_number, rfpvi.id] } %> 
    </div> 

竞标我需要​​去通过RFP得到 “invited_vendors” 这样我以后可以限制或限制供应商实际上可以提交出价。

class Bid < ActiveRecord::Base 

    attr_accessible :cost, :request_for_proposal_id, :vendor_id 

    belongs_to :request_for_proposal 
    belongs_to :vendor 
------------------------------------------------ 

mysql> desc bids; 
+-------------------------+---------------+------+-----+---------+----------------+ 
| Field     | Type   | Null | Key | Default | Extra   | 
+-------------------------+---------------+------+-----+---------+----------------+ 
| id      | int(11)  | NO | PRI | NULL | auto_increment | 
| cost     | decimal(10,0) | YES |  | NULL |    | 
| request_for_proposal_id | int(11)  | YES | MUL | NULL |    | 
| vendor_id    | int(11)  | YES | MUL | NULL |    | 
| contact_id    | int(11)  | YES | MUL | NULL |    | 
| created_at    | datetime  | NO |  | NULL |    | 
| updated_at    | datetime  | NO |  | NULL |    | 
+-------------------------+---------------+------+-----+---------+----------------+ 

================================================ 
class RequestForProposal < ActiveRecord::Base 

    attr_accessible :rfp_number, :name, :description, :title, 
        :contact_id, :business_owner_id 

    has_many :bids 
    has_many :rfp_vendors 
    has_many :vendors, :through => :rfp_vendors 

    has_and_belongs_to_many :business_owners, :class_name => :Contact, 
          :foreign_key => :business_owner_id 
    has_and_belongs_to_many :evaluators,  :class_name => :Contact, 
          :foreign_key => :evaluator_id 
----------------------------------------------- 

mysql> desc request_for_proposals; 
+----------------------------+--------------+------+-----+---------+----------------+ 
| Field      | Type   | Null | Key | Default | Extra   | 
+----------------------------+--------------+------+-----+---------+----------------+ 
| id       | int(11)  | NO | PRI | NULL | auto_increment | 
| rfp_number     | varchar(255) | NO |  | NULL |    | 
| contact_id     | int(11)  | YES |  | NULL |    | 
| vendor_id     | int(11)  | YES |  | NULL |    | 
| name      | varchar(255) | NO |  | NULL |    | 
| description    | varchar(255) | YES |  | NULL |    | 
| title      | varchar(255) | NO |  | NULL |    | 
| bid_id      | int(11)  | YES |  | NULL |    | 
| business_owner_id   | int(11)  | YES |  | NULL |    | 
| evaluator_id    | int(11)  | YES |  | NULL |    | 
| created_at     | datetime  | NO |  | NULL |    | 
| updated_at     | datetime  | NO |  | NULL |    | 
+----------------------------+--------------+------+-----+---------+----------------+ 

================================================ 
class Vendor < ActiveRecord::Base 

    attr_accessible :friendly_name 

    has_many :rfp_vendors 
    has_many :request_for_proposals, :through => :rfp_vendors 
    has_many :bids 
------------------------------------------------ 

mysql> desc vendors; 
+-------------------------+--------------+------+-----+---------+----------------+ 
| Field     | Type   | Null | Key | Default | Extra   | 
+-------------------------+--------------+------+-----+---------+----------------+ 
| id      | int(11)  | NO | PRI | NULL | auto_increment | 
| friendly_name   | varchar(255) | YES |  | NULL |    | 
| created_at    | datetime  | NO |  | NULL |    | 
| updated_at    | datetime  | NO |  | NULL |    | 
+-------------------------+--------------+------+-----+---------+----------------+ 

================================================ 
================================================ 

mysql> desc bids_contacts; 
+------------+---------+------+-----+---------+-------+ 
| Field  | Type | Null | Key | Default | Extra | 
+------------+---------+------+-----+---------+-------+ 
| bid_id  | int(11) | NO |  | NULL |  | 
| contact_id | int(11) | NO |  | NULL |  | 
+------------+---------+------+-----+---------+-------+ 

mysql> desc bids_vendors; 
+-----------+---------+------+-----+---------+-------+ 
| Field  | Type | Null | Key | Default | Extra | 
+-----------+---------+------+-----+---------+-------+ 
| bid_id | int(11) | NO |  | NULL |  | 
| vendor_id | int(11) | NO |  | NULL |  | 
+-----------+---------+------+-----+---------+-------+ 

mysql> desc rfp_vendors; 
+-------------------------+----------+------+-----+---------+----------------+ 
| Field     | Type  | Null | Key | Default | Extra   | 
+-------------------------+----------+------+-----+---------+----------------+ 
| id      | int(11) | NO | PRI | NULL | auto_increment | 
| vendor_id    | int(11) | YES |  | NULL |    | 
| request_for_proposal_id | int(11) | YES |  | NULL |    | 
| created_at    | datetime | NO |  | NULL |    | 
| updated_at    | datetime | NO |  | NULL |    | 
+-------------------------+----------+------+-----+---------+----------------+ 

??????????????????????????????????????????? ?????????

后，我让过去这个恼人不能“看” request_for_proposals，

我将需要通过达到卖方的：通过=>：rfp_venders。

我有没有细心去担心要联系Vendors.friendly_name？

Answer 1

从您显示的irb错误中，您看起来像在表单构建器实例上调用request_for_proposal，而不是ActiveRecord实例本身。

如果您有form_for @my_instance do |f|，那么块内的f是表单构建器实例，与@my_instance不是同一个对象;您应该使用@my_instance或f.object转到ActiveRecord实例。