Class: Zn::Dataset

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/zn/dataset.rb

Overview

Holds repo, associators and performs aggregate operations

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(repo) ⇒ Dataset

Returns a new instance of Dataset.



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# File 'lib/zn/dataset.rb', line 12

def initialize(repo)
  @repo = repo
  @associators = {}
end

Instance Attribute Details

#associators ⇒ Object (readonly)

Returns the value of attribute associators.



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# File 'lib/zn/dataset.rb', line 10

def associators
  @associators
end

#repo ⇒ Object (readonly)

Returns the value of attribute repo.



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# File 'lib/zn/dataset.rb', line 10

def repo
  @repo
end

Instance Method Details

#add_associator(name, associator) ⇒ Object 



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# File 'lib/zn/dataset.rb', line 17

def add_associator(name, associator)
  @associators[name] = associator
end

#associate(entities) ⇒ Object 



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# File 'lib/zn/dataset.rb', line 37

def associate(entities)
  return enum_for(:associate, entities) unless block_given?

  entities.each do |entity|
    yield entity, associations(entity)
  end
end

#associations(entity) ⇒ Object 



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# File 'lib/zn/dataset.rb', line 31

def associations(entity)
  associators.each_with_object({}) do |(name, associator), hash|
    hash[name] = associator.associate(entity)
  end
end

#keys ⇒ Object 



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# File 'lib/zn/dataset.rb', line 21

def keys
  keys = Set.new

  repo.all.each do |entity|
    keys = keys.merge entity.keys
  end

  keys.to_a
end