谁为 awesome_nested_set 使用实例方法

Question

我在 ROR 中实现了 awesome_nested_set gem，它有实例方法 (https://github.com/collectiveidea/awesome_nested_set/wiki/Awesome-nested-set-cheat-sheet)。我试过这个

Category.level(1)

但它显示错误

undefined method `level'

这也不起作用

@sa = Category.siblings('name'=>'new')

     abort(@sa.siblings.inspect)

我如何实现这些

Answer 1

似乎 level 是实例，而不是 class 方法。

所以，

category = Category.create!(bla-bla-bla)
puts category.label # this shoud work

Answer 2

级别是实例方法

它在备忘单中说 here

实例方法

my_cat.root                  root for this node
my_cat.level                 the level of this object in the tree (e.g. root = 0)
my_cat.parent                the node's immediate parent
my_cat.children              array of immediate children (just those in the next level)
my_cat.ancestors             array of all parents, parents' parents, etc, excluding self
my_cat.self_and_ancestors    array of all parents, parents' parents, etc, including self
my_cat.siblings              array of brothers and sisters (all at that level), excluding self
my_cat.self_and_siblings     array of brothers and sisters (all at that level), including self
my_cat.descendants           array of all children, children's children, etc., excluding self
my_cat.self_and_descendants  array of all children, children's children, etc., including self
my_cat.leaves                array of all descendants that have no children

所以在 Category

的实例中使用级别

Answer 3

为awesome_nested_set

使用实例方法

cat = Category.find_by_name("here")
subcats = cat.ancestors
abort(subcats.inspect)

谁为 awesome_nested_set 使用实例方法

who to use Instance methods for awesome_nested_set

ruby-on-rails

gem

instance