Question

我在视图中遇到以下异常：stories / _form.slim。异常似乎很奇怪，因为它抱怨我不想访问的属性：

SQLite3::SQLException: no such column: constraints.sentence_id: SELECT  "constraints".* FROM "constraints"  WHERE "constraints"."sentence_id" = 1 LIMIT 1

违规行是故事中的第二行/ _form.slim：

...

= form_tag("/stories/#{@story.id}", :method => "put") do
  = label_tag "Type the next line in the story. You must use the word '#{@story.curr_sentence.constraint.phrase}'."

...

模型/ story.rb：

class Story < ActiveRecord::Base
  has_many :sentences, :dependent => :destroy
  accepts_nested_attributes_for :sentences, :allow_destroy => true

  def curr_sentence
    self.sentences.find_by_turn(self.turn)
  end

  ...
end

模型/ sentence.rb：

class Sentence < ActiveRecord::Base
  belongs_to :story
  has_one :constraint
  accepts_nested_attributes_for :constraint
end

模型/ constraint.rb：

class Constraint < ActiveRecord::Base
  has_many :sentences
end

分贝/ schema.rb：

  create_table "stories", :force => true do |t|
    t.integer  "turn",       :default => 1
    t.datetime "created_at",                :null => false
    t.datetime "updated_at",                :null => false
  end

  create_table "sentences", :force => true do |t|
    t.integer  "constraint_id"
    t.integer  "story_id"
    t.datetime "created_at",      :null => false
    t.datetime "updated_at",      :null => false
  end

  create_table "constraints", :force => true do |t|
    t.string   "phrase"
    t.integer  "constraint_category_id", :limit => 255
    t.datetime "created_at",                            :null => false
    t.datetime "updated_at",                            :null => false
  end

有什么想法吗？一直撕裂我听到试图解决它：）

Answer 1

句子和约束之间的关联是错误的。您应该只以1：1的关系使用has_one。这是一对多的关系，因此您应该使用belongs_to：

class Sentence < ActiveRecord::Base
  belongs_to :story
  belongs_to :constraint
  accepts_nested_attributes_for :constraint
end

从视图中抛出关于当前未访问的模型属性的SQL异常

1 个答案: