Module: CollectiveIdea::Acts::NestedSet::Model::InstanceMethods
- Defined in:
- lib/awesome_nested_set/awesome_nested_set.rb
Overview
Any instance method that returns a collection makes use of Rails 2.1’s named_scope (which is bundled for Rails 2.0), so it can be treated as a finder.
category.self_and_descendants.count
category.ancestors.find(:all, :conditions => "name like '%foo%'")
Instance Method Summary collapse
-
#ancestors ⇒ Object
Returns an array of all parents.
-
#child? ⇒ Boolean
Returns true is this is a child node.
-
#descendants ⇒ Object
Returns a set of all of its children and nested children.
- #is_ancestor_of?(other) ⇒ Boolean
- #is_descendant_of?(other) ⇒ Boolean
- #is_or_is_ancestor_of?(other) ⇒ Boolean
- #is_or_is_descendant_of?(other) ⇒ Boolean
- #leaf? ⇒ Boolean
-
#leaves ⇒ Object
Returns a set of all of its nested children which do not have children.
-
#left ⇒ Object
Value of the left column.
-
#left_sibling ⇒ Object
Find the first sibling to the left.
-
#level ⇒ Object
Returns the level of this object in the tree root level is 0.
-
#move_left ⇒ Object
Shorthand method for finding the left sibling and moving to the left of it.
- #move_possible?(target) ⇒ Boolean
-
#move_right ⇒ Object
Shorthand method for finding the right sibling and moving to the right of it.
-
#move_to_child_of(node) ⇒ Object
Move the node to the child of another node (you can pass id only).
-
#move_to_left_of(node) ⇒ Object
Move the node to the left of another node (you can pass id only).
-
#move_to_right_of(node) ⇒ Object
Move the node to the left of another node (you can pass id only).
-
#move_to_root ⇒ Object
Move the node to root nodes.
-
#parent_id ⇒ Object
Value of the parent column.
-
#right ⇒ Object
Value of the right column.
-
#right_sibling ⇒ Object
Find the first sibling to the right.
-
#root ⇒ Object
Returns root.
-
#root? ⇒ Boolean
Returns true if this is a root node.
-
#same_scope?(other) ⇒ Boolean
Check if other model is in the same scope.
-
#self_and_ancestors ⇒ Object
Returns the array of all parents and self.
-
#self_and_descendants ⇒ Object
Returns a set of itself and all of its nested children.
-
#self_and_siblings ⇒ Object
Returns the array of all children of the parent, including self.
-
#siblings ⇒ Object
Returns the array of all children of the parent, except self.
- #to_text ⇒ Object
Instance Method Details
#ancestors ⇒ Object
Returns an array of all parents
261 262 263 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 261 def ancestors without_self self_and_ancestors end |
#child? ⇒ Boolean
Returns true is this is a child node
244 245 246 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 244 def child? !parent_id.nil? end |
#descendants ⇒ Object
Returns a set of all of its children and nested children
294 295 296 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 294 def descendants without_self self_and_descendants end |
#is_ancestor_of?(other) ⇒ Boolean
306 307 308 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 306 def is_ancestor_of?(other) self.left < other.left && other.left < self.right && same_scope?(other) end |
#is_descendant_of?(other) ⇒ Boolean
298 299 300 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 298 def is_descendant_of?(other) other.left < self.left && self.left < other.right && same_scope?(other) end |
#is_or_is_ancestor_of?(other) ⇒ Boolean
310 311 312 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 310 def is_or_is_ancestor_of?(other) self.left <= other.left && other.left < self.right && same_scope?(other) end |
#is_or_is_descendant_of?(other) ⇒ Boolean
302 303 304 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 302 def is_or_is_descendant_of?(other) other.left <= self.left && self.left < other.right && same_scope?(other) end |
#leaf? ⇒ Boolean
239 240 241 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 239 def leaf? !new_record? && right - left == 1 end |
#leaves ⇒ Object
Returns a set of all of its nested children which do not have children
276 277 278 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 276 def leaves descendants.where("#{self.class.quoted_table_name}.#{quoted_right_column_name} - #{self.class.quoted_table_name}.#{quoted_left_column_name} = 1") end |
#left ⇒ Object
Value of the left column
225 226 227 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 225 def left self[left_column_name] end |
#left_sibling ⇒ Object
Find the first sibling to the left
322 323 324 325 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 322 def left_sibling siblings.where(["#{self.class.quoted_table_name}.#{quoted_left_column_name} < ?", left]). order("#{self.class.quoted_table_name}.#{quoted_left_column_name} DESC").last end |
#level ⇒ Object
Returns the level of this object in the tree root level is 0
282 283 284 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 282 def level parent_id.nil? ? 0 : ancestors.count end |
#move_left ⇒ Object
Shorthand method for finding the left sibling and moving to the left of it.
333 334 335 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 333 def move_left move_to_left_of left_sibling end |
#move_possible?(target) ⇒ Boolean
362 363 364 365 366 367 368 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 362 def move_possible?(target) self != target && # Can't target self same_scope?(target) && # can't be in different scopes # !(left..right).include?(target.left..target.right) # this needs tested more # detect impossible move !((left <= target.left && right >= target.left) or (left <= target.right && right >= target.right)) end |
#move_right ⇒ Object
Shorthand method for finding the right sibling and moving to the right of it.
338 339 340 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 338 def move_right move_to_right_of right_sibling end |
#move_to_child_of(node) ⇒ Object
Move the node to the child of another node (you can pass id only)
353 354 355 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 353 def move_to_child_of(node) move_to node, :child end |
#move_to_left_of(node) ⇒ Object
Move the node to the left of another node (you can pass id only)
343 344 345 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 343 def move_to_left_of(node) move_to node, :left end |
#move_to_right_of(node) ⇒ Object
Move the node to the left of another node (you can pass id only)
348 349 350 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 348 def move_to_right_of(node) move_to node, :right end |
#move_to_root ⇒ Object
Move the node to root nodes
358 359 360 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 358 def move_to_root move_to nil, :root end |
#parent_id ⇒ Object
Value of the parent column
220 221 222 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 220 def parent_id self[parent_column_name] end |
#right ⇒ Object
Value of the right column
230 231 232 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 230 def right self[right_column_name] end |
#right_sibling ⇒ Object
Find the first sibling to the right
328 329 330 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 328 def right_sibling siblings.where(["#{self.class.quoted_table_name}.#{quoted_left_column_name} > ?", left]).first end |
#root ⇒ Object
Returns root
249 250 251 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 249 def root self_and_ancestors.where(parent_column_name => nil).first end |
#root? ⇒ Boolean
Returns true if this is a root node.
235 236 237 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 235 def root? parent_id.nil? end |
#same_scope?(other) ⇒ Boolean
Check if other model is in the same scope
315 316 317 318 319 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 315 def same_scope?(other) Array([:scope]).all? do |attr| self.send(attr) == other.send(attr) end end |
#self_and_ancestors ⇒ Object
Returns the array of all parents and self
254 255 256 257 258 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 254 def self_and_ancestors nested_set_scope.where([ "#{self.class.quoted_table_name}.#{quoted_left_column_name} <= ? AND #{self.class.quoted_table_name}.#{quoted_right_column_name} >= ?", left, right ]) end |
#self_and_descendants ⇒ Object
Returns a set of itself and all of its nested children
287 288 289 290 291 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 287 def self_and_descendants nested_set_scope.where([ "#{self.class.quoted_table_name}.#{quoted_left_column_name} >= ? AND #{self.class.quoted_table_name}.#{quoted_right_column_name} <= ?", left, right ]) end |
#self_and_siblings ⇒ Object
Returns the array of all children of the parent, including self
266 267 268 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 266 def self_and_siblings nested_set_scope.where(parent_column_name => parent_id) end |
#siblings ⇒ Object
Returns the array of all children of the parent, except self
271 272 273 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 271 def siblings without_self self_and_siblings end |
#to_text ⇒ Object
370 371 372 373 374 |
# File 'lib/awesome_nested_set/awesome_nested_set.rb', line 370 def to_text self_and_descendants.map do |node| "#{'*'*(node.level+1)} #{node.id} #{node.to_s} (#{node.parent_id}, #{node.left}, #{node.right})" end.join("\n") end |