Active Storage not showing images only Errors

rubyonrails-talk
1

Hey guys,

I could really use your assistance with my current app. I decided to add the active storage feature and followed the guide on how to set it up. I did a practice project first to test the water then I added it to my existing project this is the error I keep getting “ActiveModel::UnknownAttributeError in CoursesController#create”

Let me show you my code

This is the model:

`class Course < ApplicationRecord`
`def star_number`
`self.star.blank? ? 1 : self.star`
`end`
`def cover`
`has_one_attached :file`
`end`
`end`

Here is the Controller: The error keeps pointing to ’ @course = Course.new(course_params) ’

`class CoursesController < ApplicationController`
`before_action :set_course, only: %i[ show edit update destroy ]`
`# GET /courses or /courses.json`
`def index`
`u/courses = Course.all`
`end`
`# GET /courses/1 or /courses/1.json`
`def show`
`end`
`# GET /courses/new`
`def new`
`u/course = Course.new`
`end`
`# GET /courses/1/edit`
`def edit`
`end`
`# POST /courses or /courses.json`
`def create`
`u/course =` [`Course.new`](https://course.new/)`(course_params)` This is where the Error is coming from?
`respond_to do |format|`
`if u/course.save`
`format.html { redirect_to course_url(@course), notice: "Course was successfully created." }`
`format.json { render :show, status: :created, location: u/course }`
`else`
`format.html { render :new, status: :unprocessable_entity }`
`format.json { render json: u/course.errors, status: :unprocessable_entity }`
`end`
`end`
`end`
`# PATCH/PUT /courses/1 or /courses/1.json`
`def update`
`respond_to do |format|`
`if u/course.update(course_params)`
`format.html { redirect_to course_url(@course), notice: "Course was successfully updated." }`
`format.json { render :show, status: :ok, location: u/course }`
`else`
`format.html { render :edit, status: :unprocessable_entity }`
`format.json { render json: u/course.errors, status: :unprocessable_entity }`
`end`
`end`
`end`
`# DELETE /courses/1 or /courses/1.json`
`def destroy`
`u/course.destroy`
`respond_to do |format|`
`format.html { redirect_to courses_url, notice: "Course was successfully destroyed." }`
`format.json { head :no_content }`
`end`
`end`
`private`
`# Use callbacks to share common setup or constraints between actions.`
`def set_course`
`u/course = Course.find(params[:id])`
`end`
`# Only allow a list of trusted parameters through.`
`def course_params`
`params.require(:course).permit(:video, :title, :star, :description, :public, :file)`
`end`
`end`

_attachment.html.erb:

`<%if post.file.attached%>`
`<div class="row">`
`<%if post.file.image?%>`
`<div class="message-image-container">`
`<%= image_tag(post.file, class:"message-image") %>`
`</div>`
`<%end%>`
`</div>`
`<%end%>`

Lastly the course file

`<div id="<%= dom_id course %>">`
`<p>`
`<strong>Image:</strong>`
`<%= course.image %>`
`<%= render 'courses/attachment', course: course %>`
`</p>`
`<p>`
`<strong>Video:</strong>`
`<%= course.video %>`
`</p>`
`<p>`
`<strong>Title:</strong>`
`<%= course.title %>`
`</p>`
`<p>`
`<strong>Star:</strong>`
`<%= course.star %>`
`</p>`
`<p>`
`<strong>Description:</strong>`
`<%= course.description %>`
`</p>`
`</div>`

It is most likely something with the controller, but the error is not helping me out. I am having a hard time figuring it out, can you guys assist?

2

has_one_attached should be defined in Course and not in a method:

class Course < ApplicationRecord
  has_one_attached :file
  def star_number
     self.star.blank? ? 1 : self.star
  end
end