Class: ActiveWarehouse::Builder::RandomDataBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/active_warehouse/builder/random_data_builder.rb

Overview

Build random data usable for testing.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RandomDataBuilder

Initialize the random data builder



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 12

def initialize
  @generators = {
    Fixnum => FixnumGenerator.new,
    Float => FloatGenerator.new,
    Date => DateGenerator.new,
    Time => TimeGenerator.new,
    String => StringGenerator.new,
    Object => BooleanGenerator.new,
  }
  @column_generators = {}
end

Instance Attribute Details

#column_generators ⇒ Object (readonly)

Hash of names mapped to generators where the name is the column name



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 9

def column_generators
  @column_generators
end

#generators ⇒ Object (readonly)

Hash of generators where the key is the class and the value is an implementation of AbstractGenerator



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 6

def generators
  @generators
end

Instance Method Details

#build(name, options = {}) ⇒ Object

Build the data for the specified class. Name may be a Class (which must descend from ActiveWarehouse::Dimension or ActiveWarehouse::Fact), a String or a Symbol. String or Symbol will be converted to a class name and then passed back to this method.



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 27

def build(name, options={})
  case name
  when Class
    if name.respond_to?(:base_class)
      return build_dimension(name, options) if name.base_class == ActiveWarehouse::Dimension
      return build_fact(name, options) if name.base_class == ActiveWarehouse::Fact
    end
    raise "#{name} is a class but does not appear to descend from Fact or Dimension"
  when String
    begin
      build(name.classify.constantize, options)
    rescue NameError
      raise "Cannot find a class named #{name.classify}"
    end
  when Symbol
    build(name.to_s, options)
  else
    raise "Unable to determine what to build"
  end
end

#build_dimension(name, options = {}) ⇒ Object

Build test dimension data for the specified dimension name.

Options:

  • :rows: The number of rows to create (defaults to 100)

  • :generators: A map of generators where each key is Fixnum, Float, Date, Time, String, or Object and the value is extends from AbstractGenerator.



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 55

def build_dimension(name, options={})
  options[:rows] ||= 100
  options[:generators] ||= {}
  rows = []

  dimension_class = Dimension.to_dimension(name)
  options[:rows].times do
    row = {}
    dimension_class.content_columns.each do |column|
      generator = (options[:generators][column.klass] || @column_generators[column.name] || @generators[column.klass])
      if generator.nil?
        raise ArgumentError, "No generator found, unknown column type?: #{column.klass}"
      end
      row[column.name] = generator.generate(column, options)
    end
    rows << row
  end
  
  rows
end

#build_fact(name, options = {}) ⇒ Object

Build test fact data for the specified fact name

Options:

  • :rows: The number of rows to create (defaults to 100)

  • :generators: A Hash of generators where each key is Fixnum, Float, Date, Time, String, or Object and the value is extends from AbstractGenerator.

  • :fk_limit: A Hash of foreign key limits, where each key is the name of column and the value is a number. For example options[:date_id] = 1000 would limit the foreign key values to something between 1 and 1000, inclusive.

  • :dimensions: The number of available dimension FKs



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# File 'lib/active_warehouse/builder/random_data_builder.rb', line 86

def build_fact(name, options={})
  options[:rows] ||= 100
  options[:generators] ||= {}
  options[:fk_limit] ||= {}
  rows = []

  fact_class = Fact.to_fact(name)
  options[:rows].times do
    row = {}
    fact_class.content_columns.each do |column|
      generator = (options[:generators][column.klass] || @generators[column.klass])
      row[column.name] = generator.generate(column, options)
    end
    fact_class.dimension_relationships.each do |name, reflection|
      # it would be better to get a count of rows from the dimension tables
      fk_limit = (options[:fk_limit][reflection.primary_key_name] || options[:dimensions] || 100) - 1
      row[reflection.primary_key_name] = rand(fk_limit) + 1
    end
    rows << row
  end
  
  rows
end