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In my Ruby on Rails application I am trying to allow the user to choose their colour and have this as the sites background.

In my schema I have this preferences table:

create_table "perferences", force: :cascade do |t|
  t.integer  "user_id"
  t.integer  "category_id"
  t.datetime "created_at",  null: false
  t.datetime "updated_at",  null: false
  t.text     "colour"
end

The CSS background colour is in the following line:

body{line-height:1;height:100%;width:100%;color:#B2BFCB;background:#002952;text-align:center;font-family:"Apercu Regular", Calibri, sans-serif;font-weight:normal;font-style:normal;margin:0;padding:0;}

But I am unsure as to how to update the colour based upon the colour in the database.

I have tried to follow this link: http://blog.hasmanythrough.com/2007/10/18/simpler-than-dirt-restful-dynamic-css But I got the error: undefined method formatted_colour_path for #<#<Class:0x6daa0a8>:0x6881b98>

In the view:

In the perferences controller:

def show
   @colour = Perference.find_by(user_id: session[:user_id]).colour
   respond_to do |format|
        format.html
        format.css
   end
end

Can someone please help. I understand that I need to retrieve the colour from the database and then use this to update the CSS, but I am not sure how to do this.

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2
  • it is formatted_user_path(@user why are you getting formatted_colour_path this error, can you post soem more code Commented Mar 31, 2015 at 10:11
  • Sorry I should have added that in, please see the updated question Commented Mar 31, 2015 at 10:14

2 Answers 2

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4

If you try to change the body background color, then try this:

<body style="background-color: <%= @colour %>">

</body>

But it will make some consequences for you and you will need to go deeper :)

It will be better to do it this way

<body style="background-color: <%= @colour if @colour %>" >

</body>

or just write a helper.

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2 Comments

When you say 'consequences' do you mean I'll just have to validate it?
Yes. If you will open index or any other page without user and color he had choose. I will update the answer.
1

The css file is fixed - you cannot put ruby code inside. An alternative is to do something inline in your application.html.erb:

  <body style="background-color:<%= current_user.preference.color">
  </body>

This of course suppose that the user is always loaded in the "current_user" variable (you can use a condition to treat the "not logged in" case).

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6 Comments

Can you please show me how to do this. I am fairly new to Ruby on Rails.
This might be me being thick, but that gives the error: undefined local variable or method 'current_user'
you shown us a "user preferences" table, but how are you signin in your users? Using devise?
I have a separate user table and they sign in through the bcrypt gem
and how to you access normally a user preference in one of you page?
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