# JupyterOnRails

Rails is loaded on jupyter dead easy.

![Alt text](the_screenshot.png?raw=true "Title")

## Motivation

Although it was already possible to run `jupyter` + `iruby` and `require app_full_path` to load Rails application context,
it is a bit tiring to each time copy all the `require` statements.

Moreover, since Rails Way works in keeping (generally) everything under the project directory,
managing the jupyter configuration installed in user global area (the iruby kernel register thing) is again a bit awkward.

With this gem, these awkwardness is to solved by following instruments:
  * `rake jupyter:notebook` Railtie command which invokes jupyter at your project root, and
  * The rails kernel dynamically defined by the rake task which automatically loads your Rails application.


## Prerequisites

* iruby's prerequisites must be met.
  * Refer: https://github.com/SciRuby/iruby
    * Either `cztop` or `ffi-rzmq` gem must be installable.

* `jupyter` command must be somehow available.
  * Either
    * `jupyter` command (pip global install, anaconda, etc), or
    * `pipenv run jupyter` command (managed by Pipfile at project root)

## Installation

Add these lines to your application's Gemfile:

```ruby
gem 'jupyter_on_rails'

# For sessions pick either:
gem 'ffi-rzmq'
# Or
gem 'cztop'
```

And then execute:

    $ bundle install

## Usage

Starting the jupyter server is available as a rake command.

Just execute:

```sh
rake jupyter:notebook
```

Eventually, you'll have jupyter opened, and the kernel being available.


### ApplicationRecord#to_df

```ruby
User.to_df # => Daru::DataFrame is returned
```

## Development

This is a railtie gem, so you'd probably want to do something like:

```
gem 'jupyter_on_rails', git: 'GIT_URL_OF_YOUR_REPO',
                        branch: 'the-work-branch'
```

or

```
gem `jupyter_on_rails`, path: 'jupyter_on_rails_as_sub_project'
```

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/Yuki-Inoue/jupyter_on_rails.