Running list of errors encountered & their fixes

[jendiamond]

While installing simple form.

Error

$ rails generate simple_form:install --bootstrap
/home/vagrant/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/configuration.rb:37:inpwd': No such file or directory - getcwd (Errno::ENOENT)`

Fix

http://stackoverflow.com/questions/28390149/rails-generate-error-no-such-file-or-directory-getcwd
$ ps ax | grep spring

 9631 pts/1    Sl     0:00 spring server | railsgirls-signup | started 42 hours ago                                
22872 ?        Ssl    0:00 ruby -I /home/vagrant/.rvm/gems/ruby-2.3.0/gems/bundler-1.11.2/lib -I /home/vagrant/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib -e require 'spring/application/boot'
22897 pts/0    S+     0:00 grep --color=auto spring

---

I ran $ spring stop

Then it was fixed

---

[jendiamond]

While adding the paperclip to the user_tutorial page which uses simple form.

NoMethodError in Tutorials#user_tutorials

Showing /vagrant/railsgirls-signup/app/views/tutorials/_form.html.erb where line #2 raised:

undefined method `model_name' for nil:NilClass
Extracted source (around line #2):

<div style="background-color:#ccc09e; padding:10px">
  <%= simple_form_for @tutorials, html: {multipart: true} do |f| %>
    <%= f.error_notification %>

    <div class="form-inputs">
      <%= f.file_field :tryruby_image, label: "Try Ruby" %>

---

http://stackoverflow.com/questions/11093848/rails-undefined-method-model-name-for-nilclassclass

[jendiamond]

Paperclip gem

If you click the upload button without adding a photo you receive this error

ActionController::ParameterMissing in TutorialsController#update
param is missing or the value is empty: tutorial

Extracted source (around line #65):

    def tutorial_params
      params.require(:tutorial).permit(:tryruby_image, :trygit_image,
        :terminal_image, :htmlcss_image, :image, :user_id)
    end
end

This is the tutorial object that is missing:

"tutorial"=>{"trygit_image"=>#<ActionDispatch::Http::UploadedFile:0x007fdb44656f40 @tempfile=#Tempfile:/tmp/RackMultipart20160817-15847-1bkl554.png, @original_filename="trygit.png", @content_type="image/png", @headers="Content-Disposition: form-data; name="tutorial[trygit_image]"; filename="trygit.png"\r\nContent-Type: image/png\r\n">}

---

Solution:

The if params[:tutorial] cjecks whether or not a photo is being uploaded if it is not then nothing will be created.

 def update
    if params[:tutorial]
      if @tutorial.update(tutorial_params)
        redirect_to user_tutorial_path(@user, @tutorial), notice: 'Tutorial was successfully updated.'
      else
        render :edit
      end
    end
    redirect_to :back
  end

[jendiamond]

AbstractController::DoubleRenderError in TutorialsController#update
Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like "redirect_to(...) and return".

 # PATCH/PUT /tutorials/1
  def update
    if params[:tutorial]
      if @tutorial.update(tutorial_params)
        redirect_to user_tutorial_path(@user, @tutorial), notice: 'Tutorial was successfully updated.' and return
      else
        render :edit
      end
    end
    render :edit
  end

---

http://blog.arkency.com/2014/07/4-ways-to-early-return-from-a-rails-controller/

[jendiamond]

Missing Image

---

Solution:

<% if @tutorial.missing_image?(@tutorial.trygit_image).nil? %>
  <%= image_tag @tutorial.trygit_image.url(:medium,) %>
<% end %>

tutorial.rb

def missing_image?(image)
  image.url.match(/missing.png/)
end

---

trygit_imag is the image object created by imagemagic

image.url is the missing png string

---

pry(#<Tutorial>)> url
=> #<Paperclip::Attachment:0x007ff59c328748
 @dirty=false,
 @errors={},
 @instance=
  #<Tutorial:0x000000033a4528
   id: 16,
   try_ruby: nil,
   terminal: nil,
   try_git: nil,
   html_css: nil,
   user_id: 123,
   created_at: Wed, 17 Aug 2016 18:40:47 UTC +00:00,
   updated_at: Wed, 17 Aug 2016 19:11:13 UTC +00:00,
   image_file_name: nil,
   image_content_type: nil,
   image_file_size: nil,
   image_updated_at: nil,
   tryruby_image_file_name: "0c1a99b70bb1c4efa5b2b6f6e846b1407500665b_m.jpg",
   tryruby_image_content_type: "image/jpeg",
   tryruby_image_file_size: 26563,
   tryruby_image_updated_at: Wed, 17 Aug 2016 19:11:12 UTC +00:00,
   terminal_image_file_name: nil,
   terminal_image_content_type: nil,
   terminal_image_file_size: nil,
   terminal_image_updated_at: nil,
   trygit_image_file_name: nil,
   trygit_image_content_type: nil,
   trygit_image_file_size: nil,
   trygit_image_updated_at: nil,
   htmlcss_image_file_name: nil,
   htmlcss_image_content_type: nil,

---