Overview

A reusable field widget that turns any embedded one2many or many2many list into a multi-select list — the framework's real first-column checkboxes and "select all" (single click, no boolean field) — and renders batch-action buttons declared right in the list's <header>. The user ticks lines and clicks a button; the method runs on exactly those line records.

One widget (x2many_selectable) with two independent capabilities on both one2many and many2many fields.

Two independent widgets:

• x2many_selectable (on the o2m/m2m field) — row selection + batch actions, active when the list has <header> buttons: real first-column checkboxes + "select all"; each button runs on the ticked lines (self is the selection). Honours groups= and invisible="parent.<field> == ..." like form buttons. The form is auto-saved before the action; the list reloads and the selection clears afterwards.
• many2one_multi_select (on a many2one sub-field) — bulk add via Search More: the field's "Search More…" dialog opens as a multi-select list; each ticked record becomes a new line (comodel/context read from the field). Records already used as lines are hidden; options="{'allow_duplicates': true}" allows re-picking them.
• Fully independent — use either alone or both on the same list.
• Pure client-side; the only dependency is web.

Installation

1. Copy vh_x2many_selectable into your Odoo addons path.
2. Update the apps list and install VH x2many Selectable. No Python libraries and no server configuration are required.

Usage

Set the widget on the field and declare your button(s) in the list header:

<field name="line_ids" widget="x2many_selectable">
    <list editable="bottom">
        <header>
            <button name="action_mark_done" type="object" string="Mark done"
                    groups="base.group_user"
                    invisible="parent.state == 'done'"/>
        </header>
        <field name="name"/>
    </list>
</field>

Write the method on the line model — self is the ticked lines:

def action_mark_done(self):      # self = the ticked lines
    self.write({'done': True})

For a many2many field the ticked comodel records are passed the same way. The button must be defined on the line/comodel model, since Odoo validates header buttons against it.

For bulk add, put many2one_multi_select on a many2one sub-field; its "Search More…" dialog becomes multi-select and each picked record adds a line:

<field name="line_ids" widget="x2many_selectable">
    <list editable="bottom">
        <field name="product_id" widget="many2one_multi_select"/>
        <field name="qty"/>
    </list>
</field>

Support

Questions, bug reports and feature requests: vuhaiqn90@gmail.com (please include your Odoo version).