Rails自定义外键不受尊重

时间:2013-05-02 16:07:06

标签: ruby-on-rails-3

相关的数据库表具有以下模式:

sqlite> .schema structures
CREATE TABLE structures(
        struct_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
        batch_id INTEGER,
        tag TEXT,
        input_tag TEXT,
        FOREIGN KEY (batch_id) REFERENCES batches(batch_id) DEFERRABLE INITIALLY DEFERRED);
sqlite> .schema residues
CREATE TABLE residues(
        struct_id INTEGER NOT NULL,
        resNum INTEGER NOT NULL,
        name3 TEXT NOT NULL,
        res_type TEXT NOT NULL,
        FOREIGN KEY (struct_id) REFERENCES structures(struct_id) DEFERRABLE INITIALLY DEFERRED,
        PRIMARY KEY (struct_id, resNum));

我有以下型号:

class Structure < ActiveRecord::Base
    set_table_name "structures"
    self.primary_key = "struct_id"

    attr_accessible :struct_id, :batch_id, :input_tag

    has_many :residues
end

class Residue < ActiveRecord::Base
  self.primary_keys :struct_id, :resnum
  belongs_to :structure, :foreign_key => 'struct_id'
  attr_accessible :name3, :res_type, :resnum
end

在结构展示中我有:

<h2>Residues</h2>
<% @structure.residues.each do |residue| %>
  <p>
    <b>Residue number:</b>
    <%= residue.resnum %>
  </p>

  <p>
    <b>Residue type:</b>
    <%= residue.res_type %>
  </p>
<% end %>

但是,当我尝试显示结构时,我收到以下错误:

SQLite3::SQLException: no such column: residues.structure_id

为什么在数据库中查找structure_id而不是struct_id?看来我的外键没有得到尊重。

1 个答案:

答案 0 :(得分:1)

您需要在关系的两边指定外键(has_many和belongs_to)