Created
June 19, 2010 08:22
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class ParentDoc | |
include Mongoid::Document | |
embeds_many :child_docs | |
field :statistic | |
field :children_order, :type => Array, :default => [] # hold all the children's id | |
end | |
class ChildDoc | |
include Mongoid::Document | |
embedded_in :parent_doc, :inverse_of => :child_docs | |
attr_writer :position | |
after_save :update_position | |
def position | |
exsited_position = parent_doc.children_order.index(id) | |
exsited_position ? exsited_position + 1 : parent_doc.aspects.size | |
end | |
def update_position | |
if @position && (@position.to_i > 0) | |
parent_doc.children_order.delete(id) | |
parent_doc.children_order.insert(@position.to_i - 1, id) | |
parent_doc.save | |
end | |
end | |
end | |
# in the console, run | |
>> p = ParentDoc.new | |
=> #<ParentDoc _id: 4c1c7d478d0f110597000017, children_order: [], statistic: nil> | |
>> p.save | |
=> true | |
>> p.child_docs | |
=> [] | |
>> p.child_docs.create :position => 1 | |
=> #<ChildDoc _id: 4c1c7d618d0f110597000018, > | |
>> ParentDoc.find(p.id).child_docs | |
=> [#<ChildDoc _id: 4c1c7d618d0f110597000018, >, #<ChildDoc _id: 4c1c7d618d0f110597000018, >] | |
# seems it created two identical objects | |
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