Module: ClosureTree::NumericDeterministicOrdering

Extended by:
ActiveSupport::Concern
Defined in:
lib/closure_tree/numeric_deterministic_ordering.rb

Instance Method Summary collapse

Instance Method Details

#_ct_reorder_children(minimum_sort_order_value = nil) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 28

def _ct_reorder_children(minimum_sort_order_value = nil)
  scope_conditions = _ct.scope_values_from_instance(self)
  _ct.reorder_with_parent_id(_ct_id, minimum_sort_order_value, scope_conditions)
end

#_ct_reorder_prior_siblings_if_parent_changed ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 14

def _ct_reorder_prior_siblings_if_parent_changed
  return unless saved_change_to_attribute?(_ct.parent_column_name) && !@was_new_record

  was_parent_id = attribute_before_last_save(_ct.parent_column_name)
  scope_conditions = _ct.scope_values_from_instance(self)
  _ct.reorder_with_parent_id(was_parent_id, nil, scope_conditions)
end

#_ct_reorder_siblings(minimum_sort_order_value = nil) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 22

def _ct_reorder_siblings(minimum_sort_order_value = nil)
  scope_conditions = _ct.scope_values_from_instance(self)
  _ct.reorder_with_parent_id(_ct_parent_id, minimum_sort_order_value, scope_conditions)
  reload unless destroyed?
end

#add_sibling(sibling, add_after = true) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 152

def add_sibling(sibling, add_after = true)
  raise "can't add self as sibling" if self == sibling

  if _ct.dont_order_roots && parent.nil?
    raise ClosureTree::RootOrderingDisabledError, 'Root ordering is disabled on this model'
  end

  # Make sure self isn't dirty, because we're going to call reload:
  save

  _ct.with_advisory_lock do
    prior_sibling_parent = sibling.parent
    reorder_from_value = if prior_sibling_parent == parent
                           [order_value, sibling.order_value].compact.min
                         else
                           order_value
                         end

    sibling.order_value = order_value
    sibling.parent = parent
    sibling._ct_skip_sort_order_maintenance!
    sibling.save # may be a no-op

    _ct_reorder_siblings(reorder_from_value)

    # The sort order should be correct now except for self and sibling, which may need to flip:
    sibling_is_after = reload.order_value < sibling.reload.order_value
    if add_after != sibling_is_after
      # We need to flip the sort orders:
      self_ov = order_value
      sib_ov = sibling.order_value
      update_order_value(sib_ov)
      sibling.update_order_value(self_ov)
    end

    prior_sibling_parent.try(:_ct_reorder_children) if prior_sibling_parent != parent
    sibling
  end
end

#append_child(child_node) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 128

def append_child(child_node)
  add_child(child_node)
end

#append_sibling(sibling_node) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 144

def append_sibling(sibling_node)
  add_sibling(sibling_node, true)
end

#prepend_child(child_node) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 132

def prepend_child(child_node)
  child_node.order_value = -1
  child_node.parent = self
  child_node._ct_skip_sort_order_maintenance!
  if child_node.save
    _ct_reorder_children
    child_node.reload
  else
    child_node
  end
end

#prepend_sibling(sibling_node) ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 148

def prepend_sibling(sibling_node)
  add_sibling(sibling_node, false)
end

#self_and_descendants_preordered ⇒ Object 



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# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 33

def self_and_descendants_preordered
  # TODO: raise NotImplementedError if sort_order is not numeric and not null?
  hierarchy_table = self.class.hierarchy_class.arel_table
  model_table = self.class.arel_table

  # Create aliased tables for the joins
  anc_hier = _ct.aliased_table(hierarchy_table, 'anc_hier')
  anc = _ct.aliased_table(model_table, 'anc')
  depths = _ct.aliased_table(hierarchy_table, 'depths')

  # Build the join conditions using Arel
  join_anc_hier = hierarchy_table
                  .join(anc_hier)
                  .on(anc_hier[:descendant_id].eq(hierarchy_table[:descendant_id]))

  join_anc = join_anc_hier
             .join(anc)
             .on(anc[self.class.primary_key].eq(anc_hier[:ancestor_id]))

  join_depths = join_anc
                .join(depths)
                .on(
                  depths[:ancestor_id].eq(id)
                  .and(depths[:descendant_id].eq(anc[self.class.primary_key]))
                )

  self_and_descendants
    .joins(join_depths.join_sources)
    .group("#{_ct.quoted_table_name}.#{_ct.quoted_id_column_name}")
    .reorder(self.class._ct_sum_order_by(self))
end