Episode 7 · July 7, 2014
So if you want to go to rubygems and download and install this gem in your application, I always recommend grabbing this gemfile line so that you have this version, and most importantly, the version specifier here then make sure that when you run
bundle update it will update this version and not include any major version changes.
Now that we've spent some time looking into the bootstrap gem and determining why we want to use it, let's go add the bootstrap gem into one of our applications. I'm going to create a new application, and we're going to install a nav bar from bootstrap, and we're going to go take a look at that right now. If we go over to the components section, we come down to the navbar, we're going to put this inside of a rails application that I'm just going to create from scratch, so we'll go though the whole installation process and then integrate this navbar. So let's hop over to the terminal and create a new rails application.
rails new bookstore
Before we do anything, let's set up a page, so that we have a homepage to look at and we can tell if it's going to be using bootstrap or not. So normally you know there's no CSS, so we'll be able to tell pretty easily weather or not it's working.
rails generate scaffold book name:string description:text
root to: "books#index"
We see that we get the regular scaffold styles that come with a rails scaffold. First I think we should delete that so we don't have it to conflict with the bootstrap stylesheets, so we can remove the app/asset/stylesheets/scaffold.css.scss and now if we go back to Chrome, we can refresh and see that all the styles are gone, and this is just the basic stuff that Chrome uses. So if we come over here to the rubygems bootstrap sass tab and we grab the gemfile line, we'll go back to our application and open put the gemfile, and add it at the bottom. Come back to the terminal and run
bundle install, and then we'll restart our rails server, refresh the page, and nothing changed. So the gem needs to be installed, but it also needs to be loaded, so if we go back to our terminal, we're going to use the move command to rename our application css stylesheet to one that uses SCSS formatting so that we will import this bootstrap sass gem. So all we have to do is say
mv app/assets/stylesheets/application.css app/assets/stylesheets/application.scss, and if we go back to our editor and we open that at the bottom here we can use Sass to import the bootstrap stylesheet file which is provided from the bootstraps sass gem that we just installed. So now if we go back to Chrome and refresh, now we have bootstrap's font, bootstrap's color and styles, so this is good, we're almost there. Now we want to integrate this navbar code, so I'm going to copy this, and you'll be able to edit it later, but for now we'll just put in the example. So we want this navbar at the top here on every single page, which means that we want to put this inside of our application layout file. And instead of putting the code directly in this file, it's going to make this file quite a bit bigger than we want, because if you looked at that before, there was a whole lot of lines of code just for the single navbar, so we're going to do is we're going to put this in a partial so that the navbar can be shared between multiple layouts if we happen to decide that for checkoutwe're going to have a different layout, and it will be a little bit different. So to prepare for that, we're going to render a partial, and we're going to call it
<%= render partial: "shared/navbar" %>, and this is going to look in the app/views/shared/_navbar.html.erb
Transcript written by Miguel
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