# Gon-sinatra gem — get your Sinatra variables in your js
### Build Status 
If you need to send some data to your js files and you don't want to do this with long way through views and parsing - use this force!
Now with [Rabl](https://github.com/nesquena/rabl) support!
Now with [Padrino](https://github.com/padrino/padrino-framework) support as well!
For rails use [gon](https://github.com/gazay/gon).
## Usage
`my_sinatra_application.rb`
**Note: For classic (non-modular) applications, you still have to explicitely register `Gon::Sinatra`**
``` ruby
# For classic applications:
Sinatra::register Gon::Sinatra
# and if you want to the use Rabl integration
Sinatra::register Gon::Sinatra::Rabl
# For modular applications:
class MySinatraApplication < Sinatra::Base #or Padrino::Application
register Gon::Sinatra
register Gon::Sinatra::Rabl
end
```
`views/application.erb`
``` erb
some title
<%= include_gon %>
...
```
To camelize your variables in js you can use:
``` erb
some title
<%= include_gon(:camel_case => true) %>
...
```
You can change the namespace of the variables:
``` erb
some title
<%= include_gon(:namespace => 'serverExports') %>
...
```
You put something like this in the Sinatra action:
``` ruby
@your_int = 123
@your_array = [1,2]
@your_hash = {'a' => 1, 'b' => 2}
gon.your_int = @your_int
gon.your_other_int = 345 + gon.your_int
gon.your_array = @your_array
gon.your_array << gon.your_int
gon.your_hash = @your_hash
gon.all_variables # > {:your_int => 123, :your_other_int => 468, :your_array => [1, 2, 123], :your_hash => {'a' => 1, 'b' => 2}}
gon.your_array # > [1, 2, 123]
gon.clear # gon.all_variables now is {}
```
Access the varaibles from your JavaScript file:
``` js
alert(gon.your_int)
alert(gon.your_other_int)
alert(gon.your_array)
alert(gon.your_hash)
```
With camelize:
``` js
alert(gon.yourInt)
alert(gon.yourOtherInt)
alert(gon.yourArray)
alert(gon.yourHash)
```
With custom namespace and camelize:
``` js
alert(customNamespace.yourInt)
alert(customNamespace.yourOtherInt)
alert(customNamespace.yourArray)
alert(customNamespace.yourHash)
```
## Usage with Rabl
Now you can write your variables assign logic to templates with [Rabl](https://github.com/nesquena/rabl).
The way of writing Rabl templates is very clearly described in their repo.
Profit of using Rabl with gon:
1. You can clean your controllers now!
2. Work with database objects and collections clearly and easyly
3. All power of Rabl
4. You can still be lazy and don't use common way to transfer data in js
5. And so on
For using gon with Rabl you need to create new Rabl template and map gon
to it.
For example you have model Post with attributes :title and :body.
You want to get all your posts in your js as an Array.
That's what you need to do:
1. Create Rabl template. I prefer creating special directory for
templates which are not view templates.
`goners/posts/index.rabl`
``` rabl
collection @posts => 'posts'
attributes :id, :title, :body
```
2. All you need to do after that is only to map this template to gon.
``` ruby
get '/' do
# some logic
@posts = [some_objects] # Rabl works with instance variables of controller
gon.rabl 'goners/posts/index.rabl', :instance => self
# some logic
end
```
Thats it! Now you will get in your js gon.posts variable which is Array of
post objects with attributes :id, :title and :body.
In javascript file for view of this action write call to your variable:
``` js
alert(gon.posts)
alert(gon.posts[0])
alert(gon.posts[0].post.body)
```
P.s. If you didn't put include_gon tag in your html head area - it
wouldn't work. You can read about this in common usage above.
### Some tips of usage Rabl with gon:
If you don't use alias in Rabl template:
``` rabl
collection @posts
....
```
instead of using that:
``` rabl
collection @posts => 'alias'
....
```
Rabl will return you an array and gon by default will put it to variable
gon.rabl
Two ways how you can change it - using aliases or you can add alias to
gon mapping method:
``` ruby
# your logic stuff here
gon.rabl 'path/to/rabl/file', :as => 'alias', :instance => self
```
## Installation
Manually install gon-sinatra gem: `$ gem install gon-sinatra`
Add requirement to your app file
``` ruby
require 'gon-sinatra'
```
## Contributors
* @gazay
* @skade
Special thanks to @brainopia, @kossnocorp and @ai.