Ruby on rails，无法显示实例变量的内容

Question

我正在尝试为某些大学的课程复习创建应用程序。目前，我有两个模型，分别是课程和评论。我试图在课程视图中显示评论表的内容，但它仅显示内容的地址，而不能显示实际值。任何帮助，将不胜感激。

enter image description here

下面是控制器，模型和视图。

course/show.html.erb

<div class = "col-md-7">
    <h2>Tips from other students</h2>
    <%= form_with( model: @course, local: true, class: "col-md-7") do |f| %>
        <% f.fields_for :reviews do |rf| %>
            <ul class="nav nav-tabs nav-stacked col-md-12 col-lg-12 col-sm-12 well ng-scope" ng-repeat="tip in $ctrl.displayCourse.tips track by $index">
                <li class="ng-binding"><%= rf.select :reviews_content, @reviews %></span></li>
            </ul>
        <% end %>
    <% end %>
</div>

/course_controller.rb
class CoursesController < ApplicationController
    before_action :set_course, only: [:edit, :update, :show, :destroy]

    def index
        @courses = Course.all
        @reviews = Review.all
    end

    def new
        @course = Course.new
        @course.reviews.build
    end

    def create
        @course = Course.new(course_params)
        @course.save
        if @course.save
            flash[:success] = "New course has created"
            redirect_to course_path(@course)
        else 
            render 'new'
        end
    end

    def show
        @reviews = Review.where(course_id: params[:id])
    end

    def destroy
        @course = Course.find(params[:id])
        @course.destroy

        flash[:danger] = "Course was deleted"
        redirect_to courses_path
    end

    def edit
        #@course = Course.find(params[:id])
    end

    def update
        #@course = Course.find(params[:id])
        if @course.update(course_params)
            flash[:success] = "Course was updated with reviews"
            redirect_to course_path(@course)
        else
            render 'edit'
        end
    end

    private
    def set_course
        @course = Course.find(params[:id])
    end

    def course_params
        params.require(:course).permit(:coursename, :course_content, :prerequisite, :proctoredexams, :groupwork, :textbook, reviews_attributes: [:reviews_content])
    end 

    def review_params
        params.require(:course).permit(reviews_attributes: [:reviews_content])
    end
end