Class: Shushu::UnitGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/models/unit_group.rb

Constant Summary collapse

InvalidUnitGroup = 
Class.new(ShushuException)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(units) ⇒ UnitGroup

Returns a new instance of UnitGroup.



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# File 'lib/models/unit_group.rb', line 7

def initialize(units)
  @units = units
  check_rates
end

Instance Attribute Details

#units ⇒ Object (readonly)

Returns the value of attribute units.



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# File 'lib/models/unit_group.rb', line 5

def units
  @units
end

Instance Method Details

#check_rates ⇒ Object 



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# File 'lib/models/unit_group.rb', line 12

def check_rates
  if @units.map(&:rate).uniq.length > 1
    raise(InvalidUnitGroup, "Rates must be homogenius.")
  end
end

#description ⇒ Object 



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# File 'lib/models/unit_group.rb', line 50

def description
  sample_unit.product_name
end

#hid ⇒ Object 



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# File 'lib/models/unit_group.rb', line 38

def hid
  sample_unit.hid
end

#name ⇒ Object 



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# File 'lib/models/unit_group.rb', line 34

def name
  sample_unit.product_name
end

#product_group ⇒ Object 



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# File 'lib/models/unit_group.rb', line 46

def product_group
  sample_unit.product_group
end

#product_name ⇒ Object 



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# File 'lib/models/unit_group.rb', line 42

def product_name
  sample_unit.product_name
end

#qty ⇒ Object 



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# File 'lib/models/unit_group.rb', line 22

def qty
  @units.map(&:qty).reduce(:+)
end

#rate ⇒ Object 



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# File 'lib/models/unit_group.rb', line 26

def rate
  sample_unit.rate
end

#rate_period ⇒ Object 



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# File 'lib/models/unit_group.rb', line 30

def rate_period
  sample_unit.rate_period
end

#sample_unit ⇒ Object 



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# File 'lib/models/unit_group.rb', line 54

def sample_unit
  @sample_unit ||= @units.sample
end

#total ⇒ Object 



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# File 'lib/models/unit_group.rb', line 18

def total
  rate * qty
end