How get the Group object contains the particular entity

[wikii]

Hi all,I want to get the Group object that contains the selected objects.
such as:

First I select a Group
    Sketchup.active_model.selection[0]    =>  <Sketchup;;Group;0xb79eb20>
I open it ,and ,select an edge
    Sketchup.active_model.selection[0]    =>  <Sketchup;;Edge;0xb79ea48>
Now I want to get the Group object contains '<Sketchup;;Edge;0xb79ea48>' ,that should be '<Sketchup;;Group;0xb79eb20>'.Using 'parent' methods，it can't work at all.
    Sketchup.active_model.selection[0].parent =>  #<Sketchup;;ComponentDefinition;0xb79e958>

Please help me.

[TIG]

@wikii said:

Hi all,I want to get the Group object that contains the selected objects.
such as:

> First I select a Group
>     Sketchup.active_model.selection[0]    =>  <Sketchup;;Group;0xb79eb20>
> I open it ,and ,select an edge
>     Sketchup.active_model.selection[0]    =>  <Sketchup;;Edge;0xb79ea48>
> Now I want to get the Group object contains '<Sketchup;;Edge;0xb79ea48>' ,that should be '<Sketchup;;Group;0xb79eb20>'.Using 'parent' methods，it can't work at all.
>     Sketchup.active_model.selection[0].parent =>  #<Sketchup;;ComponentDefinition;0xb79e958>
> 

Please help me.

So far so good, you have the ComponentDefinintion. Let's say you set it to 'cdef', then
cdef.instances[0] will return the group you want - there's only one instance of a group's component-definition - I know it's convoluted !!!

NOW you have the parent of the edge... = the group ?