Module: CollectiveIdea::Acts::NestedSet::Base::InstanceMethods
- Defined in:
- lib/nested_set/base.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
-
#<=>(x) ⇒ Object
order by left column.
-
#==(comparison_object) ⇒ Object
Redefine to act like active record.
-
#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.
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#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).
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#move_to_left_of(node) ⇒ Object
Move the node to the left of another node (you can pass id only).
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#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.
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#root? ⇒ Boolean
Returns true if this is a root node.
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#same_scope?(other) ⇒ Boolean
Check if other model is in the same scope.
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#self_and_ancestors ⇒ Object
Returns the array of all parents and self.
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#self_and_children ⇒ Object
Returns the array of all children and self.
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#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
#<=>(x) ⇒ Object
order by left column
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# File 'lib/nested_set/base.rb', line 391 def <=>(x) left <=> x.left end |
#==(comparison_object) ⇒ Object
Redefine to act like active record
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# File 'lib/nested_set/base.rb', line 396 def ==(comparison_object) comparison_object.equal?(self) || (comparison_object.instance_of?(self.class) && comparison_object.id == id && !comparison_object.new_record?) end |
#ancestors ⇒ Object
Returns an array of all parents
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# File 'lib/nested_set/base.rb', line 419 def ancestors without_self self_and_ancestors end |
#child? ⇒ Boolean
Returns true is this is a child node
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# File 'lib/nested_set/base.rb', line 386 def child? !parent_id.nil? end |
#descendants ⇒ Object
Returns a set of all of its children and nested children
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# File 'lib/nested_set/base.rb', line 450 def descendants without_self self_and_descendants end |
#is_ancestor_of?(other) ⇒ Boolean
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# File 'lib/nested_set/base.rb', line 462 def is_ancestor_of?(other) self.left < other.left && other.left < self.right && same_scope?(other) end |
#is_descendant_of?(other) ⇒ Boolean
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# File 'lib/nested_set/base.rb', line 454 def is_descendant_of?(other) other.left < self.left && self.left < other.right && same_scope?(other) end |
#is_or_is_ancestor_of?(other) ⇒ Boolean
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# File 'lib/nested_set/base.rb', line 466 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
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# File 'lib/nested_set/base.rb', line 458 def is_or_is_descendant_of?(other) other.left <= self.left && self.left < other.right && same_scope?(other) end |
#leaf? ⇒ Boolean
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# File 'lib/nested_set/base.rb', line 381 def leaf? !new_record? && right - left == 1 end |
#leaves ⇒ Object
Returns a set of all of its nested children which do not have children
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# File 'lib/nested_set/base.rb', line 434 def leaves descendants.scoped.where("#{q_right} - #{q_left} = 1") end |
#left ⇒ Object
Value of the left column
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# File 'lib/nested_set/base.rb', line 367 def left self[left_column_name] end |
#left_sibling ⇒ Object
Find the first sibling to the left
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# File 'lib/nested_set/base.rb', line 478 def left_sibling siblings.where("#{q_left} < ?", left).reverse_order.first end |
#level ⇒ Object
Returns the level of this object in the tree root level is 0
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# File 'lib/nested_set/base.rb', line 440 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.
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# File 'lib/nested_set/base.rb', line 488 def move_left move_to_left_of left_sibling end |
#move_possible?(target) ⇒ Boolean
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# File 'lib/nested_set/base.rb', line 517 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.
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# File 'lib/nested_set/base.rb', line 493 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)
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# File 'lib/nested_set/base.rb', line 508 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)
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# File 'lib/nested_set/base.rb', line 498 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)
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# File 'lib/nested_set/base.rb', line 503 def move_to_right_of(node) move_to node, :right end |
#move_to_root ⇒ Object
Move the node to root nodes
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# File 'lib/nested_set/base.rb', line 513 def move_to_root move_to nil, :root end |
#parent_id ⇒ Object
Value of the parent column
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# File 'lib/nested_set/base.rb', line 362 def parent_id self[parent_column_name] end |
#right ⇒ Object
Value of the right column
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# File 'lib/nested_set/base.rb', line 372 def right self[right_column_name] end |
#right_sibling ⇒ Object
Find the first sibling to the right
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# File 'lib/nested_set/base.rb', line 483 def right_sibling siblings.where("#{q_left} > ?", left).first end |
#root ⇒ Object
Returns root
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# File 'lib/nested_set/base.rb', line 404 def root self_and_ancestors.first end |
#root? ⇒ Boolean
Returns true if this is a root node.
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# File 'lib/nested_set/base.rb', line 377 def root? parent_id.nil? end |
#same_scope?(other) ⇒ Boolean
Check if other model is in the same scope
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# File 'lib/nested_set/base.rb', line 471 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
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# File 'lib/nested_set/base.rb', line 414 def self_and_ancestors nested_set_scope.scoped.where("#{q_left} <= ? AND #{q_right} >= ?", left, right) end |
#self_and_children ⇒ Object
Returns the array of all children and self
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# File 'lib/nested_set/base.rb', line 409 def self_and_children nested_set_scope.scoped.where("#{q_parent} = ? or id = ?", id, id) end |
#self_and_descendants ⇒ Object
Returns a set of itself and all of its nested children
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# File 'lib/nested_set/base.rb', line 445 def self_and_descendants nested_set_scope.scoped.where("#{q_left} >= ? AND #{q_right} <= ?", left, right) end |
#self_and_siblings ⇒ Object
Returns the array of all children of the parent, including self
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# File 'lib/nested_set/base.rb', line 424 def self_and_siblings nested_set_scope.scoped.where(parent_column_name => parent_id) end |
#siblings ⇒ Object
Returns the array of all children of the parent, except self
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# File 'lib/nested_set/base.rb', line 429 def siblings without_self self_and_siblings end |
#to_text ⇒ Object
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# File 'lib/nested_set/base.rb', line 525 def to_text self.class.map_with_level(self_and_descendants) do |node,level| "#{'*'*(level+1)} #{node.id} #{node.to_s} (#{node.parent_id}, #{node.left}, #{node.right})" end.join("\n") end |