[IMP] product: Revamp the UoM definition to allow using the intuitive conversion factor + specifying if the UoM is larger/smaller than the reference one. Added a selection field.

bzr revid: uco@tinyerp.co.in-20100315073335-t5888y0tje5jcp7d

addons/product/product.py

@@ -84,7 +84,7 @@ class product_uom(osv.osv):
             help="Unit of Measure of a category can be converted between each others in the same category."),
         'factor': fields.float('Rate', digits=(12, 6), required=True,
             help='The coefficient for the formula:\n' \
-                    '1 (base unit) = coeff (this unit). Rate = 1 / Factor.'),
+                    '1 (base unit) = coeff (this unit). Ratio = 1 / Factor.'),
         'factor_inv': fields.function(_factor, digits=(12, 6),
             method=True, string='Factor',
             help='The coefficient for the formula:\n' \
@@ -93,6 +93,9 @@ class product_uom(osv.osv):
         'rounding': fields.float('Rounding Precision', digits=(16, 3), required=True,
             help="The computed quantity will be a multiple of this value. Use 1.0 for products that can not be split."),
         'active': fields.boolean('Active', help="If the active field is set to true, it will allow you to hide the unit of measure without removing it."),
+        'uom_factor': fields.selection([('bigger','Bigger than the Default'),
+                                        ('smaller','Smaller than the Default'),
+                                        ('','')],'UoM Factor'),
     }
 
     _defaults = {
@@ -100,6 +103,7 @@ class product_uom(osv.osv):
         'factor_inv': lambda *a: 1.0,
         'active': lambda *a: 1,
         'rounding': lambda *a: 0.01,
+        'uom_factor': lambda *a: 'smaller',
     }
 
     _sql_constraints = [

addons/product/product_view.xml

@@ -302,9 +302,11 @@
                 <form string="Units of Measure">
                     <field name="name" select="1"/>
                     <field name="category_id" select="1"/>
-                    <field name="factor" select="1"/>
-                    <field name="factor_inv" select="1"/>
+                    <field name="factor" select="1" attrs="{'readonly':[('uom_factor','=','bigger')]}"/>
+					<field name="factor_inv_data" select="1" string="Factor Data" attrs="{'readonly':[('uom_factor','=','smaller')]}"/>
+                    <field name="factor_inv" invisible="1"/>
                     <field name="rounding"/>
+                    <field name="uom_factor"/>
                     <field name="active"/>
                 </form>
             </field>