[ADD] sale_contract_asset: link module between account_asset and sale_contract

Allows you to set deferred revenue categories on your contracts and contract templates; contracts will set their revenue category on the lines of their invoices

addons/sale_contract_asset/__init__.py

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+import models

addons/sale_contract_asset/__openerp__.py

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+# -*- coding: utf-8 -*-
+
+{
+    'name': 'Deferred revenue management for contracts',
+    'version': '1.0',
+    'category': 'Sales Management',
+    'description': """
+This module allows you to set a deferred revenue on your subscription contracts.
+""",
+    'author': 'Odoo S.A.',
+    'website': 'https://www.odoo.com/',
+    'depends': ['sale_contract', 'account_asset'],
+    'data': [
+        'views/account_analytic_account_views.xml',
+    ],
+    'installable': True,
+    'auto_install': True,
+}

addons/sale_contract_asset/models/__init__.py

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+import account_analytic_account

addons/sale_contract_asset/models/account_analytic_account.py

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+from openerp import models, fields, api
+
+
+class account_analytic_account(models.Model):
+    _name = "account.analytic.account"
+    _inherit = "account.analytic.account"
+
+    asset_category_id = fields.Many2one('account.asset.category', 'Deferred Revenue Category',
+                                        help="This asset category will be applied to the lines of the contract's invoices.",
+                                        domain="[('type','=','sale')]")
+
+    @api.multi
+    def on_change_template(self, template_id, date_start=False):
+        res = super(account_analytic_account, self).on_change_template(template_id, date_start)
+
+        template = self.browse(template_id)
+        if template.asset_category_id:
+            res['value']['asset_category_id'] = template.asset_category_id.id
+
+        return res
+
+    @api.model
+    def _prepare_invoice_lines(self, contract, fiscal_position_id):
+        inv_lines = super(account_analytic_account, self)._prepare_invoice_lines(contract, fiscal_position_id)
+
+        for line in inv_lines:
+            line[2]['asset_category_id'] = contract.asset_category_id and contract.asset_category_id.id
+
+        return inv_lines

addons/sale_contract_asset/views/account_analytic_account_views.xml

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+<odoo>
+  <!-- Inherited Analytic Account form for contracts -->
+  <record id="account_analytic_account_form_form" model="ir.ui.view">
+      <field name="name">account.analytic.account.invoice.form.inherit</field>
+      <field name="model">account.analytic.account</field>
+      <field name="inherit_id" ref="sale_contract.account_analytic_account_form_form"/>
+      <field eval="40" name="priority"/>
+      <field name="arch" type="xml">
+        <xpath expr='//field[@name="pricelist_id"]' position='after'>
+            <field name="asset_category_id" attrs="{'invisible': [('contract_type','!=','subscription')]}" context="{'default_type':'sale'}"/>
+        </xpath>
+      </field>
+    </record>
+  </odoo>