annotate lib/plugins/awesome_nested_set/spec/awesome_nested_set_spec.rb @ 1327:287f201c2802 redmine-2.2-integration

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require 'spec_helper'

describe "AwesomeNestedSet" do
  before(:all) do
    self.class.fixtures :categories, :departments, :notes, :things, :brokens
  end

  describe "defaults" do
    it "should have left_column_default" do
      Default.acts_as_nested_set_options[:left_column].should == 'lft'
    end

    it "should have right_column_default" do
      Default.acts_as_nested_set_options[:right_column].should == 'rgt'
    end

    it "should have parent_column_default" do
      Default.acts_as_nested_set_options[:parent_column].should == 'parent_id'
    end

    it "should have scope_default" do
      Default.acts_as_nested_set_options[:scope].should be_nil
    end

    it "should have left_column_name" do
      Default.left_column_name.should == 'lft'
      Default.new.left_column_name.should == 'lft'
      RenamedColumns.left_column_name.should == 'red'
      RenamedColumns.new.left_column_name.should == 'red'
    end

    it "should have right_column_name" do
      Default.right_column_name.should == 'rgt'
      Default.new.right_column_name.should == 'rgt'
      RenamedColumns.right_column_name.should == 'black'
      RenamedColumns.new.right_column_name.should == 'black'
    end

    it "should have parent_column_name" do
      Default.parent_column_name.should == 'parent_id'
      Default.new.parent_column_name.should == 'parent_id'
      RenamedColumns.parent_column_name.should == 'mother_id'
      RenamedColumns.new.parent_column_name.should == 'mother_id'
    end
  end

  it "creation_with_altered_column_names" do
    lambda {
      RenamedColumns.create!()
    }.should_not raise_exception
  end

  it "creation when existing record has nil left column" do
    assert_nothing_raised do
      Broken.create!
    end
  end
  
  it "quoted_left_column_name" do
    quoted = Default.connection.quote_column_name('lft')
    Default.quoted_left_column_name.should == quoted
    Default.new.quoted_left_column_name.should == quoted
  end

  it "quoted_right_column_name" do
    quoted = Default.connection.quote_column_name('rgt')
    Default.quoted_right_column_name.should == quoted
    Default.new.quoted_right_column_name.should == quoted
  end

  it "left_column_protected_from_assignment" do
    lambda {
      Category.new.lft = 1
    }.should raise_exception(ActiveRecord::ActiveRecordError)
  end

  it "right_column_protected_from_assignment" do
    lambda {
      Category.new.rgt = 1
    }.should raise_exception(ActiveRecord::ActiveRecordError)
  end

  it "scoped_appends_id" do
    ScopedCategory.acts_as_nested_set_options[:scope].should == :organization_id
  end

  it "roots_class_method" do
    Category.roots.should == Category.find_all_by_parent_id(nil)
  end

  it "root_class_method" do
    Category.root.should == categories(:top_level)
  end

  it "root" do
    categories(:child_3).root.should == categories(:top_level)
  end

  it "root?" do
    categories(:top_level).root?.should be_true
    categories(:top_level_2).root?.should be_true
  end

  it "leaves_class_method" do
    Category.find(:all, :conditions => "#{Category.right_column_name} - #{Category.left_column_name} = 1").should == Category.leaves
    Category.leaves.count.should == 4
    Category.leaves.should include(categories(:child_1))
    Category.leaves.should include(categories(:child_2_1))
    Category.leaves.should include(categories(:child_3))
    Category.leaves.should include(categories(:top_level_2))
  end

  it "leaf" do
    categories(:child_1).leaf?.should be_true
    categories(:child_2_1).leaf?.should be_true
    categories(:child_3).leaf?.should be_true
    categories(:top_level_2).leaf?.should be_true

    categories(:top_level).leaf?.should be_false
    categories(:child_2).leaf?.should be_false
    Category.new.leaf?.should be_false
  end


  it "parent" do
    categories(:child_2_1).parent.should == categories(:child_2)
  end

  it "self_and_ancestors" do
    child = categories(:child_2_1)
    self_and_ancestors = [categories(:top_level), categories(:child_2), child]
    self_and_ancestors.should == child.self_and_ancestors
  end

  it "ancestors" do
    child = categories(:child_2_1)
    ancestors = [categories(:top_level), categories(:child_2)]
    ancestors.should == child.ancestors
  end

  it "self_and_siblings" do
    child = categories(:child_2)
    self_and_siblings = [categories(:child_1), child, categories(:child_3)]
    self_and_siblings.should == child.self_and_siblings
    lambda do
      tops = [categories(:top_level), categories(:top_level_2)]
      assert_equal tops, categories(:top_level).self_and_siblings
    end.should_not raise_exception
  end

  it "siblings" do
    child = categories(:child_2)
    siblings = [categories(:child_1), categories(:child_3)]
    siblings.should == child.siblings
  end

  it "leaves" do
    leaves = [categories(:child_1), categories(:child_2_1), categories(:child_3)]
    categories(:top_level).leaves.should == leaves
  end

  it "level" do
    categories(:top_level).level.should == 0
    categories(:child_1).level.should == 1
    categories(:child_2_1).level.should == 2
  end

  it "has_children?" do
    categories(:child_2_1).children.empty?.should be_true
    categories(:child_2).children.empty?.should be_false
    categories(:top_level).children.empty?.should be_false
  end

  it "self_and_descendents" do
    parent = categories(:top_level)
    self_and_descendants = [parent, categories(:child_1), categories(:child_2),
      categories(:child_2_1), categories(:child_3)]
    self_and_descendants.should == parent.self_and_descendants
    self_and_descendants.count.should == parent.self_and_descendants.count
  end

  it "descendents" do
    lawyers = Category.create!(:name => "lawyers")
    us = Category.create!(:name => "United States")
    us.move_to_child_of(lawyers)
    patent = Category.create!(:name => "Patent Law")
    patent.move_to_child_of(us)
    lawyers.reload

    lawyers.children.size.should == 1
    us.children.size.should == 1
    lawyers.descendants.size.should == 2
  end

  it "self_and_descendents" do
    parent = categories(:top_level)
    descendants = [categories(:child_1), categories(:child_2),
      categories(:child_2_1), categories(:child_3)]
    descendants.should == parent.descendants
  end

  it "children" do
    category = categories(:top_level)
    category.children.each {|c| category.id.should == c.parent_id }
  end

  it "order_of_children" do
    categories(:child_2).move_left
    categories(:child_2).should == categories(:top_level).children[0]
    categories(:child_1).should == categories(:top_level).children[1]
    categories(:child_3).should == categories(:top_level).children[2]
  end

  it "is_or_is_ancestor_of?" do
    categories(:top_level).is_or_is_ancestor_of?(categories(:child_1)).should be_true
    categories(:top_level).is_or_is_ancestor_of?(categories(:child_2_1)).should be_true
    categories(:child_2).is_or_is_ancestor_of?(categories(:child_2_1)).should be_true
    categories(:child_2_1).is_or_is_ancestor_of?(categories(:child_2)).should be_false
    categories(:child_1).is_or_is_ancestor_of?(categories(:child_2)).should be_false
    categories(:child_1).is_or_is_ancestor_of?(categories(:child_1)).should be_true
  end

  it "is_ancestor_of?" do
    categories(:top_level).is_ancestor_of?(categories(:child_1)).should be_true
    categories(:top_level).is_ancestor_of?(categories(:child_2_1)).should be_true
    categories(:child_2).is_ancestor_of?(categories(:child_2_1)).should be_true
    categories(:child_2_1).is_ancestor_of?(categories(:child_2)).should be_false
    categories(:child_1).is_ancestor_of?(categories(:child_2)).should be_false
    categories(:child_1).is_ancestor_of?(categories(:child_1)).should be_false
  end

  it "is_or_is_ancestor_of_with_scope" do
    root = ScopedCategory.root
    child = root.children.first
    root.is_or_is_ancestor_of?(child).should be_true
    child.update_attribute :organization_id, 'different'
    root.is_or_is_ancestor_of?(child).should be_false
  end

  it "is_or_is_descendant_of?" do
    categories(:child_1).is_or_is_descendant_of?(categories(:top_level)).should be_true
    categories(:child_2_1).is_or_is_descendant_of?(categories(:top_level)).should be_true
    categories(:child_2_1).is_or_is_descendant_of?(categories(:child_2)).should be_true
    categories(:child_2).is_or_is_descendant_of?(categories(:child_2_1)).should be_false
    categories(:child_2).is_or_is_descendant_of?(categories(:child_1)).should be_false
    categories(:child_1).is_or_is_descendant_of?(categories(:child_1)).should be_true
  end

  it "is_descendant_of?" do
    categories(:child_1).is_descendant_of?(categories(:top_level)).should be_true
    categories(:child_2_1).is_descendant_of?(categories(:top_level)).should be_true
    categories(:child_2_1).is_descendant_of?(categories(:child_2)).should be_true
    categories(:child_2).is_descendant_of?(categories(:child_2_1)).should be_false
    categories(:child_2).is_descendant_of?(categories(:child_1)).should be_false
    categories(:child_1).is_descendant_of?(categories(:child_1)).should be_false
  end

  it "is_or_is_descendant_of_with_scope" do
    root = ScopedCategory.root
    child = root.children.first
    child.is_or_is_descendant_of?(root).should be_true
    child.update_attribute :organization_id, 'different'
    child.is_or_is_descendant_of?(root).should be_false
  end

  it "same_scope?" do
    root = ScopedCategory.root
    child = root.children.first
    child.same_scope?(root).should be_true
    child.update_attribute :organization_id, 'different'
    child.same_scope?(root).should be_false
  end

  it "left_sibling" do
    categories(:child_1).should == categories(:child_2).left_sibling
    categories(:child_2).should == categories(:child_3).left_sibling
  end

  it "left_sibling_of_root" do
    categories(:top_level).left_sibling.should be_nil
  end

  it "left_sibling_without_siblings" do
    categories(:child_2_1).left_sibling.should be_nil
  end

  it "left_sibling_of_leftmost_node" do
    categories(:child_1).left_sibling.should be_nil
  end

  it "right_sibling" do
    categories(:child_3).should == categories(:child_2).right_sibling
    categories(:child_2).should == categories(:child_1).right_sibling
  end

  it "right_sibling_of_root" do
    categories(:top_level_2).should == categories(:top_level).right_sibling
    categories(:top_level_2).right_sibling.should be_nil
  end

  it "right_sibling_without_siblings" do
    categories(:child_2_1).right_sibling.should be_nil
  end

  it "right_sibling_of_rightmost_node" do
    categories(:child_3).right_sibling.should be_nil
  end

  it "move_left" do
    categories(:child_2).move_left
    categories(:child_2).left_sibling.should be_nil
    categories(:child_1).should == categories(:child_2).right_sibling
    Category.valid?.should be_true
  end

  it "move_right" do
    categories(:child_2).move_right
    categories(:child_2).right_sibling.should be_nil
    categories(:child_3).should == categories(:child_2).left_sibling
    Category.valid?.should be_true
  end

  it "move_to_left_of" do
    categories(:child_3).move_to_left_of(categories(:child_1))
    categories(:child_3).left_sibling.should be_nil
    categories(:child_1).should == categories(:child_3).right_sibling
    Category.valid?.should be_true
  end

  it "move_to_right_of" do
    categories(:child_1).move_to_right_of(categories(:child_3))
    categories(:child_1).right_sibling.should be_nil
    categories(:child_3).should == categories(:child_1).left_sibling
    Category.valid?.should be_true
  end

  it "move_to_root" do
    categories(:child_2).move_to_root
    categories(:child_2).parent.should be_nil
    categories(:child_2).level.should == 0
    categories(:child_2_1).level.should == 1
    categories(:child_2).left.should == 1
    categories(:child_2).right.should == 4
    Category.valid?.should be_true
  end

  it "move_to_child_of" do
    categories(:child_1).move_to_child_of(categories(:child_3))
    categories(:child_3).id.should == categories(:child_1).parent_id
    Category.valid?.should be_true
  end

  it "move_to_child_of_appends_to_end" do
    child = Category.create! :name => 'New Child'
    child.move_to_child_of categories(:top_level)
    child.should == categories(:top_level).children.last
  end

  it "subtree_move_to_child_of" do
    categories(:child_2).left.should == 4
    categories(:child_2).right.should == 7

    categories(:child_1).left.should == 2
    categories(:child_1).right.should == 3

    categories(:child_2).move_to_child_of(categories(:child_1))
    Category.valid?.should be_true
    categories(:child_1).id.should == categories(:child_2).parent_id

    categories(:child_2).left.should == 3
    categories(:child_2).right.should == 6
    categories(:child_1).left.should == 2
    categories(:child_1).right.should == 7
  end

  it "slightly_difficult_move_to_child_of" do
    categories(:top_level_2).left.should == 11
    categories(:top_level_2).right.should == 12

    # create a new top-level node and move single-node top-level tree inside it.
    new_top = Category.create(:name => 'New Top')
    new_top.left.should == 13
    new_top.right.should == 14

    categories(:top_level_2).move_to_child_of(new_top)

    Category.valid?.should be_true
    new_top.id.should == categories(:top_level_2).parent_id

    categories(:top_level_2).left.should == 12
    categories(:top_level_2).right.should == 13
    new_top.left.should == 11
    new_top.right.should == 14
  end

  it "difficult_move_to_child_of" do
    categories(:top_level).left.should == 1
    categories(:top_level).right.should == 10
    categories(:child_2_1).left.should == 5
    categories(:child_2_1).right.should == 6

    # create a new top-level node and move an entire top-level tree inside it.
    new_top = Category.create(:name => 'New Top')
    categories(:top_level).move_to_child_of(new_top)
    categories(:child_2_1).reload
    Category.valid?.should be_true
    new_top.id.should == categories(:top_level).parent_id

    categories(:top_level).left.should == 4
    categories(:top_level).right.should == 13
    categories(:child_2_1).left.should == 8
    categories(:child_2_1).right.should == 9
  end

  #rebuild swaps the position of the 2 children when added using move_to_child twice onto same parent
  it "move_to_child_more_than_once_per_parent_rebuild" do
    root1 = Category.create(:name => 'Root1')
    root2 = Category.create(:name => 'Root2')
    root3 = Category.create(:name => 'Root3')

    root2.move_to_child_of root1
    root3.move_to_child_of root1

    output = Category.roots.last.to_text
    Category.update_all('lft = null, rgt = null')
    Category.rebuild!

    Category.roots.last.to_text.should == output
  end

  # doing move_to_child twice onto same parent from the furthest right first
  it "move_to_child_more_than_once_per_parent_outside_in" do
    node1 = Category.create(:name => 'Node-1')
    node2 = Category.create(:name => 'Node-2')
    node3 = Category.create(:name => 'Node-3')

    node2.move_to_child_of node1
    node3.move_to_child_of node1

    output = Category.roots.last.to_text
    Category.update_all('lft = null, rgt = null')
    Category.rebuild!

    Category.roots.last.to_text.should == output
  end

  it "should be able to rebuild without validating each record" do
    root1 = Category.create(:name => 'Root1')
    root2 = Category.create(:name => 'Root2')
    root3 = Category.create(:name => 'Root3')

    root2.move_to_child_of root1
    root3.move_to_child_of root1

    root2.name = nil
    root2.save!(:validate => false)

    output = Category.roots.last.to_text
    Category.update_all('lft = null, rgt = null')
    Category.rebuild!(false)

    Category.roots.last.to_text.should == output
  end

  it "valid_with_null_lefts" do
    Category.valid?.should be_true
    Category.update_all('lft = null')
    Category.valid?.should be_false
  end

  it "valid_with_null_rights" do
    Category.valid?.should be_true
    Category.update_all('rgt = null')
    Category.valid?.should be_false
  end

  it "valid_with_missing_intermediate_node" do
    # Even though child_2_1 will still exist, it is a sign of a sloppy delete, not an invalid tree.
    Category.valid?.should be_true
    Category.delete(categories(:child_2).id)
    Category.valid?.should be_true
  end

  it "valid_with_overlapping_and_rights" do
    Category.valid?.should be_true
    categories(:top_level_2)['lft'] = 0
    categories(:top_level_2).save
    Category.valid?.should be_false
  end

  it "rebuild" do
    Category.valid?.should be_true
    before_text = Category.root.to_text
    Category.update_all('lft = null, rgt = null')
    Category.rebuild!
    Category.valid?.should be_true
    before_text.should == Category.root.to_text
  end

  it "move_possible_for_sibling" do
    categories(:child_2).move_possible?(categories(:child_1)).should be_true
  end

  it "move_not_possible_to_self" do
    categories(:top_level).move_possible?(categories(:top_level)).should be_false
  end

  it "move_not_possible_to_parent" do
    categories(:top_level).descendants.each do |descendant|
      categories(:top_level).move_possible?(descendant).should be_false
      descendant.move_possible?(categories(:top_level)).should be_true
    end
  end

  it "is_or_is_ancestor_of?" do
    [:child_1, :child_2, :child_2_1, :child_3].each do |c|
      categories(:top_level).is_or_is_ancestor_of?(categories(c)).should be_true
    end
    categories(:top_level).is_or_is_ancestor_of?(categories(:top_level_2)).should be_false
  end

  it "left_and_rights_valid_with_blank_left" do
    Category.left_and_rights_valid?.should be_true
    categories(:child_2)[:lft] = nil
    categories(:child_2).save(:validate => false)
    Category.left_and_rights_valid?.should be_false
  end

  it "left_and_rights_valid_with_blank_right" do
    Category.left_and_rights_valid?.should be_true
    categories(:child_2)[:rgt] = nil
    categories(:child_2).save(:validate => false)
    Category.left_and_rights_valid?.should be_false
  end

  it "left_and_rights_valid_with_equal" do
    Category.left_and_rights_valid?.should be_true
    categories(:top_level_2)[:lft] = categories(:top_level_2)[:rgt]
    categories(:top_level_2).save(:validate => false)
    Category.left_and_rights_valid?.should be_false
  end

  it "left_and_rights_valid_with_left_equal_to_parent" do
    Category.left_and_rights_valid?.should be_true
    categories(:child_2)[:lft] = categories(:top_level)[:lft]
    categories(:child_2).save(:validate => false)
    Category.left_and_rights_valid?.should be_false
  end

  it "left_and_rights_valid_with_right_equal_to_parent" do
    Category.left_and_rights_valid?.should be_true
    categories(:child_2)[:rgt] = categories(:top_level)[:rgt]
    categories(:child_2).save(:validate => false)
    Category.left_and_rights_valid?.should be_false
  end

  it "moving_dirty_objects_doesnt_invalidate_tree" do
    r1 = Category.create :name => "Test 1"
    r2 = Category.create :name => "Test 2"
    r3 = Category.create :name => "Test 3"
    r4 = Category.create :name => "Test 4"
    nodes = [r1, r2, r3, r4]

    r2.move_to_child_of(r1)
    Category.valid?.should be_true

    r3.move_to_child_of(r1)
    Category.valid?.should be_true

    r4.move_to_child_of(r2)
    Category.valid?.should be_true
  end

  it "multi_scoped_no_duplicates_for_columns?" do
    lambda {
      Note.no_duplicates_for_columns?
    }.should_not raise_exception
  end

  it "multi_scoped_all_roots_valid?" do
    lambda {
      Note.all_roots_valid?
    }.should_not raise_exception
  end

  it "multi_scoped" do
    note1 = Note.create!(:body => "A", :notable_id => 2, :notable_type => 'Category')
    note2 = Note.create!(:body => "B", :notable_id => 2, :notable_type => 'Category')
    note3 = Note.create!(:body => "C", :notable_id => 2, :notable_type => 'Default')

    [note1, note2].should == note1.self_and_siblings
    [note3].should == note3.self_and_siblings
  end

  it "multi_scoped_rebuild" do
    root = Note.create!(:body => "A", :notable_id => 3, :notable_type => 'Category')
    child1 = Note.create!(:body => "B", :notable_id => 3, :notable_type => 'Category')
    child2 = Note.create!(:body => "C", :notable_id => 3, :notable_type => 'Category')

    child1.move_to_child_of root
    child2.move_to_child_of root

    Note.update_all('lft = null, rgt = null')
    Note.rebuild!

    Note.roots.find_by_body('A').should == root
    [child1, child2].should == Note.roots.find_by_body('A').children
  end

  it "same_scope_with_multi_scopes" do
    lambda {
      notes(:scope1).same_scope?(notes(:child_1))
    }.should_not raise_exception
    notes(:scope1).same_scope?(notes(:child_1)).should be_true
    notes(:child_1).same_scope?(notes(:scope1)).should be_true
    notes(:scope1).same_scope?(notes(:scope2)).should be_false
  end

  it "quoting_of_multi_scope_column_names" do
    ["\"notable_id\"", "\"notable_type\""].should == Note.quoted_scope_column_names
  end

  it "equal_in_same_scope" do
    notes(:scope1).should == notes(:scope1)
    notes(:scope1).should_not == notes(:child_1)
  end

  it "equal_in_different_scopes" do
    notes(:scope1).should_not == notes(:scope2)
  end

  it "delete_does_not_invalidate" do
    Category.acts_as_nested_set_options[:dependent] = :delete
    categories(:child_2).destroy
    Category.valid?.should be_true
  end

  it "destroy_does_not_invalidate" do
    Category.acts_as_nested_set_options[:dependent] = :destroy
    categories(:child_2).destroy
    Category.valid?.should be_true
  end

  it "destroy_multiple_times_does_not_invalidate" do
    Category.acts_as_nested_set_options[:dependent] = :destroy
    categories(:child_2).destroy
    categories(:child_2).destroy
    Category.valid?.should be_true
  end

  it "assigning_parent_id_on_create" do
    category = Category.create!(:name => "Child", :parent_id => categories(:child_2).id)
    categories(:child_2).should == category.parent
    categories(:child_2).id.should == category.parent_id
    category.left.should_not be_nil
    category.right.should_not be_nil
    Category.valid?.should be_true
  end

  it "assigning_parent_on_create" do
    category = Category.create!(:name => "Child", :parent => categories(:child_2))
    categories(:child_2).should == category.parent
    categories(:child_2).id.should == category.parent_id
    category.left.should_not be_nil
    category.right.should_not be_nil
    Category.valid?.should be_true
  end

  it "assigning_parent_id_to_nil_on_create" do
    category = Category.create!(:name => "New Root", :parent_id => nil)
    category.parent.should be_nil
    category.parent_id.should be_nil
    category.left.should_not be_nil
    category.right.should_not be_nil
    Category.valid?.should be_true
  end

  it "assigning_parent_id_on_update" do
    category = categories(:child_2_1)
    category.parent_id = categories(:child_3).id
    category.save
    category.reload
    categories(:child_3).reload
    categories(:child_3).should == category.parent
    categories(:child_3).id.should == category.parent_id
    Category.valid?.should be_true
  end

  it "assigning_parent_on_update" do
    category = categories(:child_2_1)
    category.parent = categories(:child_3)
    category.save
    category.reload
    categories(:child_3).reload
    categories(:child_3).should == category.parent
    categories(:child_3).id.should ==  category.parent_id
    Category.valid?.should be_true
  end

  it "assigning_parent_id_to_nil_on_update" do
    category = categories(:child_2_1)
    category.parent_id = nil
    category.save
    category.parent.should be_nil
    category.parent_id.should be_nil
    Category.valid?.should be_true
  end

  it "creating_child_from_parent" do
    category = categories(:child_2).children.create!(:name => "Child")
    categories(:child_2).should == category.parent
    categories(:child_2).id.should == category.parent_id
    category.left.should_not be_nil
    category.right.should_not be_nil
    Category.valid?.should be_true
  end

  def check_structure(entries, structure)
    structure = structure.dup
    Category.each_with_level(entries) do |category, level|
      expected_level, expected_name = structure.shift
      expected_name.should == category.name
      expected_level.should == level
    end
  end

  it "each_with_level" do
    levels = [
      [0, "Top Level"],
      [1, "Child 1"],
      [1, "Child 2"],
      [2, "Child 2.1"],
      [1, "Child 3" ]]

    check_structure(Category.root.self_and_descendants, levels)

    # test some deeper structures
    category = Category.find_by_name("Child 1")
    c1 = Category.new(:name => "Child 1.1")
    c2 = Category.new(:name => "Child 1.1.1")
    c3 = Category.new(:name => "Child 1.1.1.1")
    c4 = Category.new(:name => "Child 1.2")
    [c1, c2, c3, c4].each(&:save!)

    c1.move_to_child_of(category)
    c2.move_to_child_of(c1)
    c3.move_to_child_of(c2)
    c4.move_to_child_of(category)

    levels = [
      [0, "Top Level"],
      [1, "Child 1"],
      [2, "Child 1.1"],
      [3, "Child 1.1.1"],
      [4, "Child 1.1.1.1"],
      [2, "Child 1.2"],
      [1, "Child 2"],
      [2, "Child 2.1"],
      [1, "Child 3" ]]

      check_structure(Category.root.self_and_descendants, levels)
  end

  it "should not error on a model with attr_accessible" do
    model = Class.new(ActiveRecord::Base)
    model.table_name = 'categories'
    model.attr_accessible :name
    lambda {
      model.acts_as_nested_set
      model.new(:name => 'foo')
    }.should_not raise_exception
  end

  describe "before_move_callback" do
    it "should fire the callback" do
      categories(:child_2).should_receive(:custom_before_move)
      categories(:child_2).move_to_root
    end

    it "should stop move when callback returns false" do
      Category.test_allows_move = false
      categories(:child_3).move_to_root.should be_false
      categories(:child_3).root?.should be_false
    end

    it "should not halt save actions" do
      Category.test_allows_move = false
      categories(:child_3).parent_id = nil
      categories(:child_3).save.should be_true
    end
  end

  describe "counter_cache" do

    it "should allow use of a counter cache for children" do
      note1 = things(:parent1)
      note1.children.count.should == 2
    end

    it "should increment the counter cache on create" do
      note1 = things(:parent1)
      note1.children.count.should == 2
      note1[:children_count].should == 2
      note1.children.create :body => 'Child 3'
      note1.children.count.should == 3
      note1.reload
      note1[:children_count].should == 3
    end

    it "should decrement the counter cache on destroy" do
      note1 = things(:parent1)
      note1.children.count.should == 2
      note1[:children_count].should == 2
      note1.children.last.destroy
      note1.children.count.should == 1
      note1.reload
      note1[:children_count].should == 1
    end
  end

  describe "association callbacks on children" do
    it "should call the appropriate callbacks on the children :has_many association " do
      root = DefaultWithCallbacks.create
      root.should_not be_new_record

      child = root.children.build

      root.before_add.should == child
      root.after_add.should  == child

      root.before_remove.should_not == child
      root.after_remove.should_not  == child

      child.save.should be_true
      root.children.delete(child).should be_true

      root.before_remove.should == child
      root.after_remove.should  == child
    end
  end
end