Module: ArVirtualField::HelperMethods

Defined in:
lib/ar_virtual_field.rb

Class Method Summary collapse

Class Method Details

.select_append(relation, *values) ⇒ Object 



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# File 'lib/ar_virtual_field.rb', line 7

def self.select_append(relation, *values)
  if relation.select_values.empty?
    values.unshift(relation.arel_table[Arel.star])
  end

  relation.select(*values)
end

.table_name(name) ⇒ Object 



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# File 'lib/ar_virtual_field.rb', line 15

def self.table_name(name)
  "#{name}_outer"
end

.table_with_column(name) ⇒ Object 



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# File 'lib/ar_virtual_field.rb', line 19

def self.table_with_column(name)
  "#{name}_outer.#{name}"
end

.unwrap_arel_expression(exp) ⇒ Object 



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# File 'lib/ar_virtual_field.rb', line 23

def self.unwrap_arel_expression(exp)
  Arel::Nodes::Grouping.new(
    exp.is_a?(Arel::Nodes::NodeExpression) ? exp : Arel.sql(exp)
  )
end

.wrap_to_lambda(exp) ⇒ Object 



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# File 'lib/ar_virtual_field.rb', line 29

def self.wrap_to_lambda(exp)
  case exp
  when Proc
    -> { HelperMethods.unwrap_arel_expression(exp.()) }
  else
    arel = HelperMethods.unwrap_arel_expression(exp)
    -> { arel }
  end
end