Filtering in one2many fields -OpenERP

Filtering in one2many fields -OpenERP

Last week I got into a situation that I really need to use filtering in tree view of one2many field. I have seen the use of filtering in search view, but not in tree view of a one2many field.
Example:
Note:this is just an example.
I have created a sale order. Here same product comes 2 or 3 times.

Then I was thinking for a solution... then came to find out that we can pass the filter condition in one2many fields as we provide in search views.

<code><field name="order_line" mode="tree,form" colspan="4" nolabel="1" widget="one2many_list" context="{'group_by':'name'}"></code>

Then I was able to get the filter view.

You just need to provide context="{'group_by':'field_name'}".Here field_name is the name of the field in the tree view of the one_2many field.