web/web_widget_uom/readme/USAGE.rst

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In the UoM form view specify the number of decimal places that
should be displayed for each unit of Measure:
.. image:: ../static/description/UoMDecimalPlaces.png
:alt: Decimal Places in UoM form view
In the view declaration, put widget='uom' attribute in the field tag::
...
<field name="arch" type="xml">
<tree string="View name">
...
<field name="product_qty" widget="uom"/>
...
</tree>
</field>
...
<field name="arch" type="xml">
<form string="View name">
...
<field name="product_qty" widget="uom"/>
...
</form>
</field>
...
Widget Options::
...
<field name="arch" type="xml">
<tree string="View name">
...
<field name="product_qty" widget="uom" options="{'uom_field': 'product_uom'}"/>
...
</tree>
</field>
...
If the UoM field in the model is not declared under the name uom_id, the
option uom_field must be specified with the appropriate field name.