Module: ActiveRecord::SpawnMethods

Included in:
Relation
Defined in:
lib/active_record/relation/spawn_methods.rb

Constant Summary collapse

VALID_FIND_OPTIONS = 
[ :conditions, :include, :joins, :limit, :offset, :extend,
:order, :select, :readonly, :group, :having, :from, :lock ]

Instance Method Summary collapse

Instance Method Details

#apply_finder_options(options) ⇒ Object 



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# File 'lib/active_record/relation/spawn_methods.rb', line 85

def apply_finder_options(options)
  relation = clone
  return relation unless options

  options.assert_valid_keys(VALID_FIND_OPTIONS)

  [:joins, :select, :group, :having, :limit, :offset, :from, :lock].each do |finder|
    if value = options[finder]
      relation = relation.send(finder, value)
    end
  end

  relation = relation.readonly(options[:readonly]) if options.key? :readonly

  # Give precedence to newly-applied orders and groups to play nicely with with_scope
  [:group, :order].each do |finder|
    relation.send("#{finder}_values=", Array.wrap(options[finder]) + relation.send("#{finder}_values")) if options.has_key?(finder)
  end

  relation = relation.where(options[:conditions]) if options.has_key?(:conditions)
  relation = relation.includes(options[:include]) if options.has_key?(:include)
  relation = relation.extending(options[:extend]) if options.has_key?(:extend)

  relation
end

#except(*skips) ⇒ Object 



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# File 'lib/active_record/relation/spawn_methods.rb', line 52

def except(*skips)
  result = self.class.new(@klass, table)

  (Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS).each do |method|
    result.send(:"#{method}_values=", send(:"#{method}_values")) unless skips.include?(method)
  end

  Relation::SINGLE_VALUE_METHODS.each do |method|
    result.send(:"#{method}_value=", send(:"#{method}_value")) unless skips.include?(method)
  end

  result
end

#merge(r) ⇒ Object Also known as: & 



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# File 'lib/active_record/relation/spawn_methods.rb', line 5

def merge(r)
  merged_relation = clone
  return merged_relation unless r

  ((Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS) - [:joins, :where]).each do |method|
    value = r.send(:"#{method}_values")
    unless value.empty?
      if method == :includes
        merged_relation = merged_relation.includes(value)
      else
        merged_relation.send(:"#{method}_values=", value)
      end
    end
  end

  merged_relation = merged_relation.joins(r.joins_values)

  merged_wheres = @where_values

  r.where_values.each do |w|
    if w.respond_to?(:operator) && w.operator == :==
      merged_wheres = merged_wheres.reject { |p|
        p.respond_to?(:operator) && p.operator == :== && p.operand1.name == w.operand1.name
      }
    end

    merged_wheres += [w]
  end

  merged_relation.where_values = merged_wheres

  Relation::SINGLE_VALUE_METHODS.reject {|m| m == :lock}.each do |method|
    unless (value = r.send(:"#{method}_value")).nil?
      merged_relation.send(:"#{method}_value=", value)
    end
  end

  merged_relation.lock_value = r.lock_value unless merged_relation.lock_value

  # Apply scope extension modules
  merged_relation.send :apply_modules, r.extensions

  merged_relation
end

#only(*onlies) ⇒ Object 



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# File 'lib/active_record/relation/spawn_methods.rb', line 66

def only(*onlies)
  result = self.class.new(@klass, table)

  onlies.each do |only|
    if (Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS).include?(only)
      result.send(:"#{only}_values=", send(:"#{only}_values"))
    elsif Relation::SINGLE_VALUE_METHODS.include?(only)
      result.send(:"#{only}_value=", send(:"#{only}_value"))
    else
      raise "Invalid argument : #{only}"
    end
  end

  result
end