Wsrtjtyk

I am using the Paperclip gem. A user can submit a location with an image. I do not want the user to duplicate an already submitted location, but they can add an image to it.

I have been trying to figure it out. I will leave the important code below:

location.rb

class Location < ApplicationRecord

  has_many :submissions

  has_many :users, through: :submissions

  # Allows submission objects

  accepts_nested_attributes_for :submissions

submission.rb

class Submission < ApplicationRecord

  belongs_to :user

  belongs_to :location



  has_attached_file :image, styles: { large: "600x600>", medium: "300x300>", thumb: "150x150#" }

  validates_attachment_content_type :image, content_type: /Aimage/.*z/

locations_controller.rb

class LocationsController < ApplicationController



  # Before actions get routed and ran, find_location will occur

  before_action :find_location, only: [:show, :edit, :update, :destroy]





  # For the Locations/index.html.erb

  def index

    @locations = Location.all

  end



  # Binds submission object to the form in new.html.erb

  def new

    @locations = Location.new

    @locations.submissions.build

  end



  # For creating a new location in the new.html.erb form

  def create

    @locations = Location.new(user_params)

    # Everything went well. User will be sent to @locations show page

    if  @locations.save

      # Redirects to user submitted locations

      redirect_to @locations

    else

      render 'new'

    end

  end



  # Finds new location user submitted by its unique id

  def show

  end



  # Allowing user to update their submitted location

  def edit

  end



  # Updates users edited submission

  def update

    if @locations.update(user_params)

      # Redirects to user submitted locations

      redirect_to @locations

    else

      render 'edit'

    end

  end



  # Deletes users submission

  def destroy

    @locations.destroy

    # Redirects to user submitted locations

    redirect_to @locations

  end



  private



  # Used for finding user submitted location (Prevents DRY)

  def find_location

    @locations = Location.find(params[:id])

  end



  # Strong parameters for security - Defines what can be update/created in location model

  def user_params

    params.require(:location).permit(:city, :state, :submissions_attributes => [:image])

  end

end

_form.html.erb

<%= form_for @locations, html: {multipart: true} do |f| %>

.

.

.

<!--  User enters image-->

  <%= f.fields_for :submissions do |s| %>

  <div class="form-group">

    <h3>Upload Image:</h3>

    <%= s.file_field :image, class: 'form-control' %>

  </div>

    <% end %>

<% end %>

show.html.erb

<h3>Image: <%= image_tag @locations.image.url(:medium) %></h3>

I get an error:

"undefined method `image' for.."

It looks like you're trying to do form tags for collections of records, which I don't think will work. Instead, I think you need a structure something like:

<% @locations.each do |location| %>

  <%= form_for location, html: {multipart: true} do |f| %>

  .

  .

  .

  <!--  User enters image-->

  <%= f.fields_for location.submissions.new do |s| %>

    <div class="form-group">

      <h3>Upload Image:</h3>

      <%= s.file_field :image, class: 'form-control' %>

    </div>

  <% end %>

<% end %>

both the form_for and fields_for need to point to a singular resource.

Side note: Paperclip has been deprecated, and it is recommended that you instead use the Rails internal ActiveStorage.