#md_data

An easy notation for describing multidimensional data.

For example:

1994
  BuenosAires
    Coal
      19t
    Potassium
      5t
1995
  BuenosAires
    Coal
      8t
    Potassium
      6t

Can be written down as:

class MaterialConsumption
  include MdData

  dimension :year, [:year_1994, :year_1995]
  dimension :city, [:buenos_aires, :zagreb]
  dimension :material, [:coal, :potassium]

  table_data do
    context 'year_1994 && buenos_aires' do
      add '8t', 'coal'
      add '5t', 'potassium'
    end
    context 'year_1995 && buenos_aires' do
      add '8t', 'coal'
      add '5t', 'potassium'
    end
  end
end

MaterialConsumption.select(:year => :year_1994, :city => :buenos_aires, :material => :coal) #=> '8t'

##Usage By defining dimensions you get helper methods that can be used in 'context' and 'add' conditionals.

context 'year_1994 && buenos_aires'  do
  add '8t', 'coal'
end

Equals

context 'year == :year_1994 && city == :buenos_aires' do
  add '8t', 'material == :coal'
end

Important thing here is that this is still just Ruby in quotes. You can add any conditionals that you need while you still have basic scenario covered and simplified.

##Usage For any type of ruled based querying, when you want to pull out specific data based on attributes and rules.

Installation

Add this line to your application's Gemfile:

gem 'md_data'

And then execute:

$ bundle

Or install it yourself as:

$ gem install md_data

Limitations

• No nested context allowed(yet)
• Tests for mis formed data definition
• Support for same dimension instance value and resolving of ambiguity

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request