module Ancestry::MaterializedPath
store ancestry as grandparent_id/parent_id root a=nil,id=1 children=id,id/% == 1, 1/% 3: a=1/2,id=3 children=a/id,a/id/% == 1/2/3, 1/2/3/%
Constants
- ANCESTRY_DELIMITER
- BEFORE_LAST_SAVE_SUFFIX
- IN_DATABASE_SUFFIX
- ROOT
Public Class Methods
extended(base)
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# File lib/ancestry/materialized_path.rb, line 11 def self.extended(base) base.send(:include, InstanceMethods) end
Public Instance Methods
ancestors_of(object)
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# File lib/ancestry/materialized_path.rb, line 23 def ancestors_of(object) t = arel_table node = to_node(object) where(t[primary_key].in(node.ancestor_ids)) end
children_of(object)
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# File lib/ancestry/materialized_path.rb, line 35 def children_of(object) t = arel_table node = to_node(object) where(t[ancestry_column].eq(node.child_ancestry)) end
descendant_conditions(object)
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deprecated
# File lib/ancestry/materialized_path.rb, line 54 def descendant_conditions(object) t = arel_table node = to_node(object) t[ancestry_column].matches("#{node.child_ancestry}/%", nil, true).or(t[ancestry_column].eq(node.child_ancestry)) end
descendants_of(object)
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# File lib/ancestry/materialized_path.rb, line 48 def descendants_of(object) node = to_node(object) indirects_of(node).or(children_of(node)) end
indirects_of(object)
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indirect = anyone who is a descendant, but not a child
# File lib/ancestry/materialized_path.rb, line 42 def indirects_of(object) t = arel_table node = to_node(object) where(t[ancestry_column].matches("#{node.child_ancestry}#{ANCESTRY_DELIMITER}%", nil, true)) end
inpath_of(object)
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# File lib/ancestry/materialized_path.rb, line 29 def inpath_of(object) t = arel_table node = to_node(object) where(t[primary_key].in(node.path_ids)) end
ordered_by_ancestry(order = nil)
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# File lib/ancestry/materialized_path.rb, line 72 def ordered_by_ancestry(order = nil) if %w(mysql mysql2 sqlite sqlite3).include?(connection.adapter_name.downcase) reorder(arel_table[ancestry_column], order) elsif %w(postgresql oracleenhanced).include?(connection.adapter_name.downcase) && ActiveRecord::VERSION::STRING >= "6.1" reorder(Arel::Nodes::Ascending.new(arel_table[ancestry_column]).nulls_first, order) else reorder( Arel::Nodes::Ascending.new(Arel::Nodes::NamedFunction.new('COALESCE', [arel_table[ancestry_column], Arel.sql("''")])), order ) end end
ordered_by_ancestry_and(order)
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# File lib/ancestry/materialized_path.rb, line 85 def ordered_by_ancestry_and(order) ordered_by_ancestry(order) end
path_of(object)
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# File lib/ancestry/materialized_path.rb, line 15 def path_of(object) to_node(object).path end
roots()
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# File lib/ancestry/materialized_path.rb, line 19 def roots where(arel_table[ancestry_column].eq(ROOT)) end
siblings_of(object)
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# File lib/ancestry/materialized_path.rb, line 66 def siblings_of(object) t = arel_table node = to_node(object) where(t[ancestry_column].eq(node[ancestry_column].presence)) end
subtree_of(object)
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# File lib/ancestry/materialized_path.rb, line 60 def subtree_of(object) t = arel_table node = to_node(object) descendants_of(node).or(where(t[primary_key].eq(node.id))) end