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我在嘗試提交記錄時遇到ActiveRecord :: AssociationTypeMismatch錯誤。Ruby on Rails:ActiveRecord :: AssociationTypeMismatch
主題(#88982676)預期,得到了字符串(#20223000)
查看:
<%= f.collection_select :subject, Subject.order(:subject), :subject, :subject, {prompt: "Select a subject"}, {class: "form-control"} %>
控制器:
def create
@homework = current_user.homeworks.build(homework_params)
if @homework.save
redirect_to homeworks_path
else
render 'new'
end
end
...
def homework_params
params.require(:homework).permit(:subject, :description, :date, :completed_at)
end
型號:Homework.rb
class Homework < ActiveRecord::Base
validates :subject, presence:true
belongs_to :subject
def completed?
!completed_at.blank?
end
end
subject.rb中
class Subject < ActiveRecord::Base
has_many :homeworks
def to_s
subject
end
end
這種利用工作,但突然沒有。我沒有改變表的名稱爲「主題」,並相應地更改了視圖和控制器。它現在似乎在尋找身份證?主題是一個字符串。有什麼建議?謝謝。