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Contents
module Adminpanel
module Sortable
extend ActiveSupport::Concern
# the lower the (position) integer is, the better it is.
included do
before_create :set_position
before_destroy :rearrange_positions
end
module ClassMethods
def is_sortable?
true
end
def ordered
order('position ASC')
end
def in_better_position(current_position, new_position)
where(
'position >= ? AND position < ?',
new_position,
current_position
)
end
def in_worst_position(current_position, new_position)
where(
'position > ? AND position <= ?',
current_position,
new_position
)
end
end
def move_to_position(new_position)
if new_position < position
# search for better elements and downgrade them
self.class.in_better_position(
self.position,
new_position
).update_all('position = position + 1')
else
# search for worster elements and upgrade them
self.class.in_worst_position(
self.position,
new_position
).update_all('position = position - 1')
end
self.update(position: new_position)
end
protected
def rearrange_positions
self.class.where(
'position > ?', self.position
).update_all('position = position - 1')
end
def set_position
last_record = self.class.ordered.last
if last_record.nil?
# this is the first record that is created
self.position = 1
else
self.position = last_record.position + 1
end
end
end
end
Version data entries
27 entries across 27 versions & 1 rubygems