# Rails Cheatsheet
## Rails
### Creating a new project for the first time
{% hint style="info" %}
Make sure to install postgresql for your system:\
Ubuntu: \
Mac: \
WSL:
{% endhint %}
**Select your version of Ruby** using either `rvm` or `rbenv`. I'll be using `Ruby v3.0.0`.
**Select the compatible version of Node** using`nvm` At the time of writing, this is v14.6.0.
{% hint style="info" %}
Node v15.11.0 has issues with Ruby v3.0.0. and Rails v6.1.3
{% endhint %}
**Create a new project** with `rails new [name] -T -d=postgresql`
{% hint style="info" %}
Rails comes with the testing framework "Mini Test" by default. The `-T` tells Rails not to include Mini Test.
{% endhint %}
{% hint style="info" %}
Rails will create a new Rails app with sqlite3, if you don't specify the database used. Specify postgresql with `-d=postgresql`
{% endhint %}
#### Issues with creating new projust
Change the Gemfile pg version to the lastest here: At the time of writing, it was pg v1.2.3
Run `bundle binstubs bundler`
Run `rails webpacker:install`�
### Create your Database
Run `db:create`
### Add RSpec as a testing framework
Open up your Gemfile
Under `group :development, :test`, add:
```
gem 'rspec-rails'
```
Then run the following command in your Terminal,
```
bundle install
```
This will install RSpec and any others you may have entered.
### Setup rails to generate RSpec Test files
Run the following piece of code:
```
rails g rspec:install
```
This will make rails generate a rspec testing file when you generate a controller.
### Generating a Controller
Generate a controller with:
```
rails g controller [name_of_controller]
```
{% hint style="info" %}
"g" stands for generate
{% endhint %}
If you've set up rspec in the above step, it will also generate the rspec tests for you.
`gamesfreak26@Xanthic-Laptop:~/Documents/Rails/blog_app$ rails g controller pages` \
`Running via Spring preloader in process 9637` \
`create app/controllers/pages_controller.rb` \
`invoke erb` \
`create app/views/pages` \
`invoke rspec` \
`create spec/requests/pages_spec.rb` \
`invoke helper` \
`create app/helpers/pages_helper.rb` \
`invoke rspec` \
`create spec/helpers/pages_helper_spec.rb` \
`invoke assets` \
`invoke scss` \
`create app/assets/stylesheets/pages.scss`
### Removing a controller
```
rails d controller [name_of_controller]
```
{% hint style="info" %}
"d" stands for destroy
{% endhint %}
This will remove your controller
`gamesfreak26@Xanthic-Laptop:~/Documents/Rails/blog_app$ rails d controller pages`\
`Running via Spring preloader in process 9312` \
`remove app/controllers/pages_controller.rb` \
`invoke erb` \
`remove app/views/pages` \
`invoke helper` \
`remove app/helpers/pages_helper.rb` \
`invoke assets` \
`invoke scss` \
`remove app/assets/stylesheets/pages.scss`
### Setting up the postgresql database with a username and password
{% hint style="warning" %}
This is only for localhost (127.0.0.1)
{% endhint %}
Set up another user and substitute `pguser` for your postgres username
```
sudo -u postgres createuser -s pguser
```
To set a password for the user, run this command to enter postgres:
```
sudo -u postgres psql
```
While in postgres, you can change the password for `pguser` or the user you substituted using:
```
postgres=# \password pguser
```
Enter your password and quit postgres using:
```
postgres=# \q
```
In your `config/database.yml` file, enter the following under the "default: \&default" section that mentions pool.
```
host: localhost
username: pguser
password: password
```
Be sure to substitute your username and password for what you set!