Limit minimum quantity when creating manual purchase orders.

README

@@ -1,6 +1,12 @@
 
 This Module runs with the Tryton application platform.
 
+This module is developed and tested over a Tryton server and core modules
+patched with patches from `trytond-patches project`_ (take care with the
+branches). Maybe these patches are required for the module to work.
+
+.. _trytond-patches project: https://bitbucket.org/nantic/trytond-patches
+
 Installing
 ----------
 

__init__.py

@@ -8,6 +8,7 @@ def register():
     Pool.register(
         ProductSupplier,
         PurchaseRequest,
+        PurchaseLine,
         module='stock_supply_minimum', type_='model')
     Pool.register(
         CreatePurchase,

doc/index.rst

@@ -1,7 +1,8 @@
-Stock Supply Minimum Module
-###########################
+Stock Supply Minimum
+####################
 
-The Stock Supply Minimum module adds Minimum Quantity on the Product
-Supplier form. This allows to define the minimum purchase quantity for the given
-product and supplier so purchases created for this product and supplier from
-purchase requests will honour this value.
+The Stock Supply Minimum module adds Minimum Quantity on the Product's
+Supplier field.
+It allows to define the minimum purchase quantity for the given product and
+supplier, so purchases created for this product and supplier (manually or from
+purchase requests) will respect this condition.

purchase.py

@@ -1,9 +1,11 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# The COPYRIGHT file at the top level of this repository contains the full
+# copyright notices and license terms.
 from trytond.model import fields
-from trytond.pool import PoolMeta
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Bool, Eval
 
-__all__ = ['ProductSupplier', 'PurchaseRequest', 'CreatePurchase']
+__all__ = ['ProductSupplier', 'PurchaseRequest', 'CreatePurchase',
+    'PurchaseLine']
 __metaclass__ = PoolMeta
 
 
@@ -17,13 +19,15 @@ class PurchaseRequest:
     minimum_quantity = fields.Function(fields.Float('Minimum Quantity'),
         'on_change_with_minimum_quantity')
 
-    @fields.depends('supplier', 'product')
+    @fields.depends('supplier', 'product', 'uom')
     def on_change_with_minimum_quantity(self, name):
+        Uom = Pool().get('product.uom')
         if not self.product:
             return
         for product_supplier in self.product.product_suppliers:
             if product_supplier.party == self.party:
-                return product_supplier.minimum_quantity
+                return Uom.compute_qty(self.product.purchase_uom,
+                    product_supplier.minimum_quantity, self.uom)
 
 
 class CreatePurchase:
@@ -34,3 +38,62 @@ class CreatePurchase:
         line = super(CreatePurchase, cls).compute_purchase_line(request)
         line.quantity = max(line.quantity, request.minimum_quantity)
         return line
+
+
+class PurchaseLine:
+    __name__ = 'purchase.line'
+
+    minimum_quantity = fields.Float('Minimum Quantity', readonly=True, states={
+            'invisible': ~Bool(Eval('minimum_quantity')),
+            },
+        help='The quantity must be greater or equal than minimum quantity')
+
+    @fields.depends('minimum_quantity')
+    def on_change_product(self):
+        minimum_quantity = self._get_minimum_quantity()
+        if minimum_quantity and (not self.quantity or
+                self.quantity < minimum_quantity):
+            self.quantity = minimum_quantity
+        else:
+            minimum_quantity = None
+
+        res = super(PurchaseLine, self).on_change_product()
+        if minimum_quantity:
+            res['minimum_quantity'] = minimum_quantity
+            res['quantity'] = minimum_quantity
+        else:
+            res['minimum_quantity'] = None
+        return res
+
+    @fields.depends('minimum_quantity')
+    def on_change_quantity(self):
+        minimum_quantity = self._get_minimum_quantity()
+        if (self.quantity and minimum_quantity and
+                self.quantity < minimum_quantity):
+            self.quantity = minimum_quantity
+        else:
+            minimum_quantity = None
+
+        res = super(PurchaseLine, self).on_change_quantity()
+        if minimum_quantity:
+            res['minimum_quantity'] = minimum_quantity
+            res['quantity'] = minimum_quantity
+        else:
+            res['minimum_quantity'] = None
+        return res
+
+    @fields.depends('product', '_parent_purchase.party', 'quantity', 'unit',
+        'minimum_quantity')
+    def _get_minimum_quantity(self):
+        Uom = Pool().get('product.uom')
+        if not self.product or not self.purchase.party:
+            return
+        for product_supplier in self.product.product_suppliers:
+            if product_supplier.party == self.purchase.party:
+                minimum_quantity = product_supplier.minimum_quantity
+                uom_category = self.product.purchase_uom.category
+                if (minimum_quantity and self.unit and
+                        self.unit in uom_category.uoms):
+                    return Uom.compute_qty(self.product.purchase_uom,
+                        minimum_quantity, self.unit)
+                return minimum_quantity

purchase.xml

@@ -9,15 +9,36 @@ this repository contains the full copyright notices and license terms. -->
             <field name="name">product_supplier_form</field>
         </record>
 
+        <!-- purchase.request -->
         <record model="ir.ui.view" id="purchase_request_view_form">
             <field name="model">purchase.request</field>
             <field name="inherit" ref="stock_supply.purchase_request_view_form"/>
             <field name="name">purchase_request_form</field>
         </record>
+
         <record model="ir.ui.view" id="purchase_request_view_tree">
             <field name="model">purchase.request</field>
             <field name="inherit" ref="stock_supply.purchase_request_view_tree"/>
             <field name="name">purchase_request_tree</field>
         </record>
+
+        <!-- purchase.line -->
+        <record model="ir.ui.view" id="purchase_line_view_form">
+            <field name="model">purchase.line</field>
+            <field name="inherit" ref="purchase.purchase_line_view_form"/>
+            <field name="name">purchase_line_form</field>
+        </record>
+
+        <record model="ir.ui.view" id="purchase_line_view_tree">
+            <field name="model">purchase_line</field>
+            <field name="inherit" ref="purchase.purchase_line_view_tree"/>
+            <field name="name">purchase_line_tree</field>
+        </record>
+
+        <record model="ir.ui.view" id="purchase_line_view_tree_sequence">
+            <field name="model">purchase_line</field>
+            <field name="inherit" ref="purchase.purchase_line_view_tree_sequence"/>
+            <field name="name">purchase_line_tree_sequence</field>
+        </record>
     </data>
 </tryton>