How to add Pretty URLs to an existing project

FriendlyId

Add the gem to your gemfile.
```
gem friendly_id
```
After including FriendlyId, run the bundle command.
```
bundle install
```
In order to add FriendlyId to an existing application, we will need to create a migration to add the necessary field to the model we want to use FriendlyId with. We add uniq to enforce unique slug values.
```
rails g migration AddSlugToPost slug:uniq
```
Now we need to update our database:
```
rake db:migrate
```
Now, we need to add code to our model to tell rails that we wish to use FriendlyId. Open the desired model and add the following code.
```
extend FriendlyId
friendly_id :title, use: :slugged
```
We are almost there! While technically we are all set up and good to go, existing data still doesn't have a slug. In order to add a slug, start a rails console:
```
rails c
```
Inside the rails console, run a command to loop through each model and save it:
```
Posts.find_each(&:save)
```
As a final step, we need to change our .finds to friendly finds.
```
Post.find(params[:id])
```
becomes
```
Post.friendly.find(params[:id])
```
Now it should work! Checkout out dem purrty URLs.