The hierarchy of styles in Rails CSS/SCSS

I'm currently exploring the concept of css precedence rules in rails.

In my application, I am looking to apply different css rules based on different controllers. However, when I add css to one of the css.scss files, it ends up affecting all controller pages.

Here are snippets from admin.css.scss and rsv_ps.css.scss:

body {
    background: #fff;
}

body {
    background: url("DSC_1581.JPG") no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='DSC_1581.JPG', sizingMethod='scale');
    -ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='DSC_1581.JPG', sizingMethod='scale')";
}

Strangely, when I visit both http://localhost:3000/admin or http://localhost:3000/rsvps/new, they both display the background image.

Shouldn't URLs starting with http://localhost:3000/admin use the admin.css.scss stylesheet instead of the rsv_ps.css.scss stylesheet?

cssruby-on-railsruby-on-rails-3sass

Answer №1

@meagar and @catfish have made valid points, although it's curious why they haven't posted their answers.

The reason for having separate pages is simply for organization purposes, not to keep the CSS separated. The asset pipeline will merge and compress all the individual CSS files into one large file.

Therefore, you must segregate your styles by utilizing specific selectors.

For instance:

# For admin
body.admin {

}

# HTML
<body class='admin'>


# For everything else
body.default {

}

# HTML
<body class='default'>

To define the markup in your layout:

<body class="<%= @admin ? 'admin' : 'default' %>">

Answer №2

To customize which files are compiled into application.css, you can remove the line *= require_tree . from your manifest file and set it up manually. Alternatively, you could rename application.css to application.css.scss and use @import to include specific stylesheets. Remember to add any new .css/.scss files in 

config/environments/production.rb
.

Another option is to apply a unique css class to the body for admin views, overriding the default styling:

<body class='<%= 'admin' if @admin %>'>

You can then set the value of @admin using a filter in your controller.

Answer №3

When using the Rails assets pipeline
, a single minified version is generated for all included css files and added to every page.

In order to apply different styles to different pages, it is important to use separate selectors. Another option is to use layouts to differentiate styles, although creating multiple layouts just for this purpose may not be ideal.

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