Module: ClosureTree::NumericDeterministicOrdering

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

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#_ct_reorder_children(minimum_sort_order_value = nil) ⇒ Object 



24
25
26
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 24

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

#_ct_reorder_prior_siblings_if_parent_changed ⇒ Object 



12
13
14
15
16
17
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 12

def _ct_reorder_prior_siblings_if_parent_changed
  if attribute_changed?(_ct.parent_column_name) && !@was_new_record
    was_parent_id = attribute_was(_ct.parent_column_name)
    _ct.reorder_with_parent_id(was_parent_id)
  end
end

#_ct_reorder_siblings(minimum_sort_order_value = nil) ⇒ Object 



19
20
21
22
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 19

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

#add_sibling(sibling, add_after = true) ⇒ Object 



105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 105

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

  # 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 == self.parent
      [self.order_value, sibling.order_value].compact.min
    else
      self.order_value
    end

    sibling.order_value = self.order_value
    sibling.parent = self.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 = self.reload.order_value < sibling.reload.order_value
    if add_after != sibling_is_after
      # We need to flip the sort orders:
      self_ov, sib_ov = self.order_value, sibling.order_value
      update_order_value(sib_ov)
      sibling.update_order_value(self_ov)
    end

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

#append_child(child_node) ⇒ Object 



84
85
86
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 84

def append_child(child_node)
  add_child(child_node)
end

#append_sibling(sibling_node) ⇒ Object 



97
98
99
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 97

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

#prepend_child(child_node) ⇒ Object 



88
89
90
91
92
93
94
95
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 88

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

#prepend_sibling(sibling_node) ⇒ Object 



101
102
103
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 101

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

#self_and_descendants_preordered ⇒ Object 



28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/closure_tree/numeric_deterministic_ordering.rb', line 28

def self_and_descendants_preordered
  # TODO: raise NotImplementedError if sort_order is not numeric and not null?
  join_sql = <<-SQL
    JOIN #{_ct.quoted_hierarchy_table_name} anc_hier
      ON anc_hier.descendant_id = #{_ct.quoted_hierarchy_table_name}.descendant_id
    JOIN #{_ct.quoted_table_name} anc
      ON anc.#{_ct.quoted_id_column_name} = anc_hier.ancestor_id
    JOIN #{_ct.quoted_hierarchy_table_name} depths
      ON depths.ancestor_id = #{_ct.quote(self.id)} AND depths.descendant_id = anc.#{_ct.quoted_id_column_name}
  SQL

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