Class: InOrder::Trim

Inherits:
Object
  • Object
show all
Includes:
Aux::SortElements
Defined in:
app/models/in_order/trim.rb

Overview

Ensures a list does not exceed a specified length

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Aux::SortElements

sort_elements

Constructor Details

#initialize(_max = nil, destroy: true, take_from: :bottom, max: _max) ⇒ Trim

Returns a new instance of Trim.



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# File 'app/models/in_order/trim.rb', line 10

def initialize(_max=nil, destroy: true, take_from: :bottom, max: _max)
  self.destroy = destroy

  self.max = max&.to_i

  self.take_from = take_from
end

Instance Attribute Details

#destroy ⇒ Object Also known as: destroy?

Returns the value of attribute destroy.



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# File 'app/models/in_order/trim.rb', line 7

def destroy
  @destroy
end

#max ⇒ Object

Returns the value of attribute max.



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# File 'app/models/in_order/trim.rb', line 7

def max
  @max
end

#take_from ⇒ Object

Returns the value of attribute take_from.



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# File 'app/models/in_order/trim.rb', line 7

def take_from
  @take_from
end

Class Method Details

.call(*keys) ⇒ Object 



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# File 'app/models/in_order/trim.rb', line 40

def call(*keys)
  elements = InOrder::Fetch.new(*keys).elements

  args = block_given? ? yield : [ maximum, destroy: false ]

  InOrder::Trim.new(*args).call(elements).map(&:subject)
end

.set_max(max) ⇒ Object 



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# File 'app/models/in_order/trim.rb', line 48

def set_max(max)
  self.maximum = max

  self
end

Instance Method Details

#call(elements, max_size = max) ⇒ Object 



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# File 'app/models/in_order/trim.rb', line 18

def call(elements, max_size=max)
  return unless max_size

  elements = elements.dup

  InOrder::Element.transaction do
    while elements.size > max_size.to_i
      if take_from == :bottom
        delete elements.pop

        unlink elements.last
      else
        delete elements.shift
      end
    end
  end
  elements
end