Question

图书管理员：

 class BooksController < ApplicationController
 before_action :set_book, only: [:show, :edit, :update, :destroy]

 # GET /books
 # GET /books.json
 def index
 if params[:student_id]
  student = Student.find(params[:student_id])
  @books = student.books

 else
  @books = Book.all
 end
 respond_to do |format|
  format.html
  format.csv {render text: @books.to_csv }

  end
end





  def show

  end


  def new
   @book = Book.new
  end


  def edit
  end


  def create
  @book = Book.new(book_params)
  respond_to do |format|
  if @book.save
    format.html { redirect_to @book, notice: 'Book was successfully created.'    }
    format.json { render :show, status: :created, location: @book }
  else
    format.html { render :new }
    format.json { render json: @book.errors, status: :unprocessable_entity }
  end
end
 end


  def update
    respond_to do |format|
  if @book.update(book_params)
    format.html { redirect_to @book, notice: 'Book was successfully updated.' }
    format.json { render :show, status: :ok, location: @book }
  else
    format.html { render :edit }
    format.json { render json: @book.errors, status: :unprocessable_entity }
    end
  end
end


def destroy
  @book.destroy
  respond_to do |format|
  format.html { redirect_to books_url, notice: 'Book was successfully       destroyed.' }
  format.json { head :no_content }
end
end

private
  # Use callbacks to share common setup or constraints between actions.
def set_book
  @book = Book.find(params[:id])
end

 # Never trust parameters from the scary internet, only allow the white list through.
def book_params
  params.require(:book).permit(:book_name, :book_level, :total_words,  :words_wrong, :self_corrections, :student_id)
end

 end

这是我的“学生管理员”

class StudentsController < ApplicationController

def show
    @student = Student.find(params[:id]) rescue nil
    @books = Book.where(student_id: params[:id])
    @book = Book.new  


end

def create
    student = Student.new(student_parameters)
    student.user_id = current_user.id
    if student.save
        redirect_to student
    else
        redirect_to 'students#index'
    end
  end


def index
    @students = Student.where("user_id = ?",current_user.id)
    @student = Student.new  
end

private

def student_parameters
    params.require(:student).permit(:first_name, :last_name)
end





end

书籍属于学生，在索引视图中，我显示了个人的学生书籍，我希望页面顶部的标题说“{current student}的书”。我不确定如何拨打当前学生的姓名，我认为我混淆的原因是我正在使用书籍控制器而且student.first_name和student.last_name对我来说无法使用

此外，我想知道在使用学生控制器时如何访问图书数据。例如，当我在本地主持人：3000 /学生/ 2时，我想向所有学生展示书籍。

我正在寻找类似current_student.books或current_student.name的内容，但我不知道如何创建它们。

Answer 1

而不是......

student = Student.find(params[:student_id])
  @books = student.books

...做

@student = Student.find(params[:student_id])
  @books = @student.books

这为您提供了可在视图中使用的实例变量@student，尤其是@student.first_name和@student.last_name

您可能希望调整视图中的代码，以便仅显示@student是否为nil（如果未传递params[:student_id]则为nil。）

如何在Rails中跨控制器访问变量和方法

1 个答案: