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# Panda
Panda is an mvc framework built with Ruby for building web applications.
## Getting started
Clone Panda
$ git clone https://github.com/andela-akabiru/panda
Add this line to your application's Gemfile:
```ruby
gem 'panda', path: 'path_to_panda'
```
And then execute:
$ bundle
## Usage
Panda uses the mvc pattern. Thus your application structure should be as follows:
.
├── app
│ ├── controllers
│ │ └── todo_controller.rb
│ ├── models
│ │ └── todo.rb
│ └── views
│ ├── layouts
│ │ └── application.html.erb
│ └── todo
│ ├── edit.html.erb
│ ├── index.html.erb
│ ├── new.html.erb
│ └── show.html.erb
├── config
│ ├── application.rb
│ └── routes.rb
├── config.ru
├── db
│ └── app.db
├── Gemfile
├── Gemfile.lock
└── README.md
### Routes
Your routes should be defined in `config/routes.rb` file. Here's an example.
```ruby
TodoApplication.routes.draw do
root "todo#index"
get "/todo", to: "todo#index"
get "/todo/new", to: "todo#new"
get "/todo/:id", to: "todo#show"
get "/todo/:id/edit", to: "todo#edit"
post "/todo", to: "todo#create"
put "/todo/:id", to: "todo#update"
delete "/todo/:id", to: "todo#destroy"
end
```
### Models
Models are defined in `app/models` folder. Here's an example model
```ruby
class Todo < Panda::Record::Base
to_table :todos
property :id, type: :integer, primary_key: true
property :title, type: :text, nullable: false
property :body, type: :text, nullable: false
property :status, type: :text, nullable: false
property :created_at, type: :text, nullable: false
create_table
end
```
### Controllers
Controllers are defined in `app/controllers`. Here's an example controller.
```ruby
class TodoController < Panda::BaseController
def index
@todos = Todo.all
end
def show
@todo = Todo.find(params["id"])
end
def new
end
def edit
@todo = Todo.find(params["id"])
end
def update
todo = Todo.find(params["id"])
todo.update(
title: params["title"],
body: params["body"],
status: params["status"]
)
redirect_to "/todo/#{todo.id}"
end
def create
Todo.create(
title: params["title"],
body: params["body"],
status: params["status"],
created_at: Time.now.to_s
)
redirect_to "/todo"
end
def destroy
todo = Todo.find(params["id"])
todo.destroy
redirect_to "/todo"
end
end
```
### Views
Views are mapped to the controller actions. E.g if You have a `TodoController`, views for that controller should be defined in `app/views/todos/action_name.erb`. Panda depends on [Tilt](https://github.com/rtomayko/tilt) gem and thus supports embedded ruby in the views. Instance variables defined in the controller actions can be accessed in the corresponding view.
Here's an example usage:
Controller `app/controllers/todo_controller.rb`
```ruby
[...]
def index
@todos = Todo.all
end
[...]
```
View `app/views/index.html.erb`
```html
My Todos
<% @todos.each do |todo| %>
<%= todo.title %> <%= todo.status %>
Show | Edit
<% end %>
New Todo
```
Note that there's an layout file `app/views/layouts/application.html.erb`. Here you can define your general view layout. Other views will be rendered inside the file.
Here's a sample layout file:
```html
<%= title %>
<%= yield %>
```
### Configuration
I bet you've noticed that there's a `config.ru` file. This file that gets called when we run our panda application. However, there're some few things to take note of:
Set the `APP_ROOT` to the current directory since panda uses that constant to find templates.
```ruby
APP_ROOT = __dir__
```
Require `config/appliaction`
```ruby
require_relative './config/application.rb'
```
Add method override middleware. This masks put and delete request as post requests.
```ruby
use Rack::MethodOverride
```
After this what's left is initialising the panda application, locading the routes and running it.
To run the application run
$ bundle exec rackup
at the root of your application.
### Tests
Panda is well tested with a sample application for integration tests and unit specs for the base model. To run the specs run
$ bundle exec rake
Or
$ bundle exec rspec -fd
## Application Limitations
* Panda does not have a generator for file structures.
* Panda does not support model relationships at the moment
## Dependencies
1. [Ruby](https://github.com/rbenv/rbenv)
2. [SQlite3](https://github.com/sparklemotion/sqlite3-ruby)
3. [Bundler](https://github.com/bundler/bundler)
4. [Rack](https://github.com/rack/rack)
5. [Rack Test](https://github.com/brynary/rack-test)
6. [Rspec](https://github.com/rspec/rspec)
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/andela-akabiru/panda. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).