Class: ChemistryKit::Chemist::Repository::CsvChemistRepository

Inherits:
Object
  • Object
show all
Defined in:
lib/chemistrykit/chemist/repository/csv_chemist_repository.rb

Overview

Provides the ability to load a chemist by type identifyer from a csv file

Instance Method Summary collapse

Constructor Details

#initialize(csv_path) ⇒ CsvChemistRepository

Returns a new instance of CsvChemistRepository.



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# File 'lib/chemistrykit/chemist/repository/csv_chemist_repository.rb', line 14

def initialize(csv_path)
  @tables = []
  @chemist_cache = {}
  files = csv_path.kind_of?(String) ? [csv_path] : csv_path

  files.each do |file|
    raise ArgumentError, 'Supplied file does not exist!' unless File.exist? file
    table = CSV.read(file, { headers: true, converters: :all, header_converters: :symbol })
    [:key, :type].each do |header|
      unless table.headers.include?(header) || table.headers.length == 0
        raise ArgumentError, "You must define a #{header.to_s} field!"
      end
    end
    @tables.push table
  end
end

Instance Method Details

#load_chemist_by_key(key) ⇒ Object

Required Method Load a specific chemist by the unique key

Raises:

  • (ArgumentError) 


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# File 'lib/chemistrykit/chemist/repository/csv_chemist_repository.rb', line 33

def load_chemist_by_key(key)
  @tables.each do |table|
    chemist_data = table.find { |row| row[:key] == key }
    chemist = make_chemist(key, chemist_data[:type], chemist_data) if chemist_data
    return fetch_from_cache(chemist) if chemist
  end
  raise ArgumentError, "Chemist for type \"#{key}\" not found!"
end

#load_first_chemist_of_type(type) ⇒ Object

Required Method Load the first chemist found for a given type



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# File 'lib/chemistrykit/chemist/repository/csv_chemist_repository.rb', line 44

def load_first_chemist_of_type(type)
  fetch_from_cache(load_chemists_of_type(type)[0])
end

#load_random_chemist_of_type(type) ⇒ Object

Required Method Loads a chemist at random from all those found with a given type



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# File 'lib/chemistrykit/chemist/repository/csv_chemist_repository.rb', line 50

def load_random_chemist_of_type(type)
  fetch_from_cache(load_chemists_of_type(type).sample)
end