uploaded discount module

sale_discount_total/__init__.py

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+import models

sale_discount_total/__openerp__.py

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+{
+    'name': 'Sale Discount for Total Amount',
+    'version': '1.0',
+    'category': 'sale',
+    'sequence': 6,
+    'summary': "extension of default Sale Management module meant to provide discount for total amount",
+    'author': 'Cybrosys Techno Solutions',
+    'company': 'Cybrosys Techno Solutions',
+    'website': 'http://www.cybrosys.com',
+
+    'description': """
+
+Sale Discount for Total Amount
+=======================
+Module to manage discount for total amount in Sale.
+        Two Type of Discount,
+        Discount by a fixed value,
+        Discount by a percentage...
+""",
+    'depends': ['sale', 'base', 'stock'],
+    'data': [
+        'views/sale_view.xml',
+        'views/account_invoice_view.xml'
+
+    ],
+    'demo': [
+    ],
+    'installable': True,
+    'auto_install': False,
+}

sale_discount_total/models/__init__.py

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+import account_invoice
+import sale

sale_discount_total/models/account_invoice.py

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+from openerp import api, models, fields
+from openerp.osv import osv
+import openerp.addons.decimal_precision as dp
+
+
+class AccountInvoice(models.Model):
+    _inherit = "account.invoice"
+
+    @api.one
+    @api.depends('invoice_line.price_subtotal', 'tax_line.amount')
+    def _compute_amount(self):
+        self.amount_untaxed = sum(line.price_subtotal for line in self.invoice_line)
+        self.amount_tax = sum(line.amount for line in self.tax_line)
+        if self.discount_type == 'percent':
+            self.amount_discount = ((self.amount_untaxed + self.amount_tax) * self.discount_rate) / 100
+        elif self.discount_type == 'amount':
+            self.amount_discount = self.discount_rate
+        self.amount_total = self.amount_untaxed + self.amount_tax - self.amount_discount
+
+    discount_type = fields.Selection([('percent', 'Percentage'), ('amount', 'Amount')], 'Discount Type', readonly=True,
+                                     states={'draft': [('readonly', False)]})
+    discount_rate = fields.Float('Discount rate', digits_compute=dp.get_precision('Account'), readonly=True,
+                                 states={'draft': [('readonly', False)]})
+    amount_discount = fields.Float(string='Discount', digits=dp.get_precision('Account'),
+                                   readonly=True, compute='_compute_amount')
+    amount_untaxed = fields.Float(string='Subtotal', digits=dp.get_precision('Account'),
+                                  readonly=True, compute='_compute_amount', track_visibility='always')
+    amount_tax = fields.Float(string='Tax', digits=dp.get_precision('Account'),
+                              readonly=True, compute='_compute_amount')
+    amount_total = fields.Float(string='Total', digits=dp.get_precision('Account'),
+                                readonly=True, compute='_compute_amount')
+
+    @api.onchange('discount_type', 'discount_rate')
+    def compute_discount(self):
+        for inv in self:
+            amount = sum(line.price_subtotal for line in self.invoice_line)
+            tax = sum(line.amount for line in self.tax_line)
+            if inv.discount_type == 'percent':
+                if inv.discount_rate == 100:
+                    disc_amnt = amount + tax
+                else:
+                    disc_amnt = (amount + tax) * inv.discount_rate / 100
+                total = amount + tax - disc_amnt
+                self.amount_discount = disc_amnt
+                self.amount_total = total
+            else:
+                total = (amount + tax) - inv.discount_rate
+                self.amount_discount = inv.discount_rate
+                self.amount_total = total
+
+    @api.model
+    def _prepare_refund(self, invoice, date=None, period_id=None, description=None, journal_id=None):
+        res = super(AccountInvoice, self)._prepare_refund(invoice, date, period_id,
+                                                          description, journal_id)
+        res.update({
+            'discount_type': self.discount_type,
+            'discount_rate': self.discount_rate,
+        })
+        return res
+
+
+class invoice_line(osv.Model):
+    _inherit = 'account.invoice.line'
+
+    def move_line_get(self, cr, uid, invoice_id, context=None):
+        res = super(invoice_line, self).move_line_get(cr, uid, invoice_id, context=context)
+        inv = self.pool.get('account.invoice').browse(cr, uid, invoice_id, context=context)
+
+        if inv.type in ('out_invoice', 'out_refund') and inv.discount_type:
+            prop = self.pool.get('ir.property').get(cr, uid, 'property_account_income_categ', 'product.category',
+                                                    context=context)
+            prop_id = prop and prop.id or False
+            account_id = self.pool.get('account.fiscal.position').map_account(cr, uid, inv.fiscal_position or False,
+                                                                              prop_id)
+            sign = -1
+
+            res.append({
+                'name': 'Discount',
+                'price_unit': sign * inv.amount_discount,
+                'quantity': 1,
+                'price': sign * inv.amount_discount,
+                'account_id': account_id,
+                'product_id': False,
+                'uos_id': False,
+                'account_analytic_id': False,
+                'taxes': False,
+            })
+        return res

sale_discount_total/models/sale.py

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+from openerp.osv import fields, osv
+from openerp import api
+import openerp.addons.decimal_precision as dp
+
+
+class SaleOrder(osv.Model):
+    _inherit = 'sale.order'
+
+    def _amount_all(self, cr, uid, ids, field_name, arg, context=None):
+        cur_obj = self.pool.get('res.currency')
+        res = {}
+        for order in self.browse(cr, uid, ids, context=context):
+            res[order.id] = {
+                'amount_untaxed': 0.0,
+                'amount_discount': 0.0,
+                'amount_tax': 0.0,
+                'amount_total': 0.0,
+            }
+            val = val1 = val2 = 0.0
+            cur = order.pricelist_id.currency_id
+            for line in order.order_line:
+                val1 += line.price_subtotal
+                val += self._amount_line_tax(cr, uid, line, context=context)
+            if order.discount_type == 'amount':
+                val2 = order.discount_rate
+            elif order.discount_type == 'percent':
+                val2 = ((val1 + val) * order.discount_rate) / 100
+            res[order.id]['amount_tax'] = cur_obj.round(cr, uid, cur, val)
+            res[order.id]['amount_untaxed'] = cur_obj.round(cr, uid, cur, val1)
+            res[order.id]['amount_discount'] = cur_obj.round(cr, uid, cur, val2)
+            res[order.id]['amount_total'] = res[order.id]['amount_untaxed'] + res[order.id]['amount_tax'] - \
+                                            res[order.id]['amount_discount']
+        return res
+
+    def _get_order(self, cr, uid, ids, context=None):
+        result = {}
+        for line in self.pool.get('sale.order.line').browse(cr, uid, ids, context=context):
+            result[line.order_id.id] = True
+        return result.keys()
+
+    _columns = {
+        'discount_type': fields.selection([
+            ('percent', 'Percentage'),
+            ('amount', 'Amount')], 'Discount type'),
+        'discount_rate': fields.float('Discount Amount', digits_compute=dp.get_precision('Account'),
+                                      readonly=True,
+                                      states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, ),
+        'amount_discount': fields.function(_amount_all, digits_compute=dp.get_precision('Account'), string='Discount',
+                                           multi='sums', help="The total discount."),
+        'amount_untaxed': fields.function(_amount_all, digits_compute=dp.get_precision('Account'),
+                                          string='Untaxed Amount',
+                                          multi='sums', help="The amount without tax.", track_visibility='always'),
+        'amount_tax': fields.function(_amount_all, digits_compute=dp.get_precision('Account'), string='Taxes',
+                                      multi='sums', help="The tax amount."),
+        'amount_total': fields.function(_amount_all, digits_compute=dp.get_precision('Account'), string='Total',
+                                        multi='sums', help="The total amount."),
+    }
+
+    _defaults = {
+        'discount_type': 'percent',
+    }
+
+    @api.onchange('discount_type', 'discount_rate')
+    def compute_discount(self):
+        for order in self:
+            val1 = val2 = 0.0
+            for line in order.order_line:
+                val1 += line.price_subtotal
+                val2 += self._amount_line_tax(line)
+            if order.discount_type == 'percent':
+                if order.discount_rate == 100:
+                    disc_amnt = val1 + val2
+                else:
+                    disc_amnt = (val1 + val2) * order.discount_rate / 100
+                total = val1 + val2 - disc_amnt
+                self.currency_id = order.pricelist_id.currency_id
+                self.amount_discount = disc_amnt
+                self.amount_total = total
+            else:
+                total = (val1 + val2) - order.discount_rate
+                self.currency_id = order.pricelist_id.currency_id
+                self.amount_discount = order.discount_rate
+                self.amount_total = total
+
+    def _prepare_invoice(self, cr, uid, order, lines, context=None):
+        invoice_vals = super(SaleOrder, self)._prepare_invoice(cr, uid, order, lines, context=context)
+        invoice_vals.update({
+            'discount_type': order.discount_type,
+            'discount_rate': order.discount_rate
+        })
+        return invoice_vals

sale_discount_total/views/account_invoice_view.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<openerp>
+    <data>
+        <record id="discount_account_invoice_view_form1" model="ir.ui.view">
+            <field name="name">discount.account.invoice</field>
+            <field name="model">account.invoice</field>
+            <field name="inherit_id" ref="account.invoice_form"/>
+            <field name="arch" type="xml">
+                <xpath expr="//group[@class='oe_subtotal_footer oe_right']" position="replace">
+                    <group col="4">
+                        <group name="discount">
+                            <field name="discount_type"/>
+                            <field name="discount_rate"/>
+                        </group>
+                        <group class="oe_subtotal_footer oe_right">
+                            <field name="amount_untaxed" widget="monetary" options="{'currency_field': 'currency_id'}"/>
+                                <div>
+                                    <label for="amount_tax"/>
+                                    <button name="button_reset_taxes" states="draft,proforma2"
+                                        string="(update)" class="oe_link oe_edit_only"
+                                        type="object" help="Recompute taxes and total"/>
+                                </div>
+                            <field name="amount_tax" nolabel="1" widget="monetary" options="{'currency_field': 'currency_id'}"/>
+                            <field name="amount_discount" widget='monetary' options="{'currency_field': 'currency_id'}"/>
+                            <field name="amount_total" class="oe_subtotal_footer_separator" widget="monetary" options="{'currency_field': 'currency_id'}"/>
+                            <field name="residual" groups="account.group_account_user" widget="monetary" options="{'currency_field': 'currency_id'}"/>
+                            <field name="reconciled" invisible="1"/>
+                        </group>
+                    </group>
+                </xpath>
+
+            </field>
+        </record>
+    </data>
+</openerp>

sale_discount_total/views/sale_view.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<openerp>
+    <data>
+        <record id="discount_sale_view_form" model="ir.ui.view">
+            <field name="name">discount.sale.order.form</field>
+            <field name="model">sale.order</field>
+            <field name="inherit_id" ref="sale.view_order_form"/>
+            <field name="arch" type="xml">
+                <xpath expr="//group[@name='sale_total']" position="replace">
+                    <group col="4">
+                        <group name="discount">
+                            <field name="discount_type"/>
+                            <field name="discount_rate"/>
+                        </group>
+                        <group class="oe_subtotal_footer oe_right" colspan="2" name="sale_total">
+                            <field name="amount_untaxed" widget='monetary' options="{'currency_field': 'currency_id'}"/>
+                            <field name="amount_tax" widget='monetary' options="{'currency_field': 'currency_id'}"/>
+                            <field name="amount_discount" widget='monetary' options="{'currency_field': 'currency_id'}"/>
+                            <div class="oe_subtotal_footer_separator oe_inline">
+                                <label for="amount_total" />
+                                <button name="button_dummy"
+                                        states="draft,sent" string="(update)" type="object" class="oe_edit_only oe_link"/>
+                            </div>
+                            <field name="amount_total" nolabel="1" class="oe_subtotal_footer_separator" widget='monetary' options="{'currency_field': 'currency_id'}"/>
+                        </group>
+                    </group>
+                </xpath>
+                <xpath expr="//button[@string='Create Invoice']" position="attributes">
+                    <attribute name="context">{'discount_type':discount_type,'discount_rate':discount_rate,'amount_discount':amount_discount}</attribute>
+                </xpath>
+            </field>
+        </record>
+    </data>
+</openerp>