Class: BabySqueel::Calculation

Inherits:
Object
  • Object
show all
Defined in:
lib/baby_squeel/calculation.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node) ⇒ Calculation

Returns a new instance of Calculation.



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# File 'lib/baby_squeel/calculation.rb', line 5

def initialize(node)
  @node = node
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/baby_squeel/calculation.rb', line 3

def node
  @node
end

Instance Method Details

#to_s ⇒ Object

In Active Record 5, we don’t need this class to make calculations work. They happily accept arel. However, when grouping with a calculation, there’s a really, really weird alias name. It calls #to_s on the Arel.

If this were not addressed, it would likely break query caching because the alias would have a unique name every time.



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# File 'lib/baby_squeel/calculation.rb', line 17

def to_s
  if node.respond_to?(:map)
    names = node.map do |child|
      if child.kind_of?(String) || child.kind_of?(Symbol)
        child.to_s
      elsif child.respond_to?(:name)
        child.name.to_s
      end
    end
    names.compact.uniq.join('_')
  else
    # fix for https://github.com/rails/rails/commit/fc38ff6e4417295c870f419f7c164ab5a7dbc4a5
    node.to_sql.split('"').map { |v| v.tr('^A-Za-z0-9_', '').presence }.compact.uniq.join('_')
  end
end