Module: Resort::Sortable::ClassMethods

Defined in:
lib/resort.rb

Overview

Class methods to be used from the model class.

Instance Method Summary collapse

Instance Method Details

#first_in_order ⇒ ActiveRecord::Base

Returns the first element of the list.

Returns:

  • (ActiveRecord::Base) —

    the first element of the list.



76
77
78
 
# File 'lib/resort.rb', line 76

def first_in_order
  scoped.where(:first => true).first
end

#last_in_order ⇒ ActiveRecord::Base

Returns the last element of the list.

Returns:

  • (ActiveRecord::Base) —

    the last element of the list.



83
84
85
 
# File 'lib/resort.rb', line 83

def last_in_order
  scoped.where(:next_id => nil).first
end

#ordered ⇒ Array<ActiveRecord::Base>

Returns eager-loaded Components in order.

OPTIMIZE: Use IdentityMap when available

Returns:

  • (Array<ActiveRecord::Base>) —

    the ordered elements



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/resort.rb', line 92

def ordered
  ordered_elements = []
  elements = {}

  scoped.each do |element|
    if ordered_elements.empty? && element.first?
      ordered_elements << element
    else
      elements[element.id] = element
    end
  end

  raise "Multiple or no first items in the list where found. Consider defining a siblings method" if ordered_elements.length != 1 && elements.length > 0
  
  elements.length.times do
    ordered_elements << elements[ordered_elements.last.next_id]
  end
  ordered_elements.compact
end