Add module pos_default_empty_image

Big perf improvement for loading POS if you have thousand of products
without image

pos_default_empty_image/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+   :alt: License: AGPL-3
+
+===========================
+POS Default Empty Image
+===========================
+
+In the point of sale, trying to load known inexistant images is a waste of time.
+
+
+When you have 8000 products in your Point of Sale and most of them don't have images, 
+you are happy to save thousands of useless requests : the POS load way faster.
+
+Technical information
+=====================
+
+Each time the pos instantiate a product, it will add an
+
+    <img src="'/web/binary/image?model=product.product&field=image_medium&id='+product.id;">
+
+The browser will trigger as many requests than there is different url.
+
+
+If you have many products, the browser will soon reach his limit of network connections to Odoo server and
+will wait for free slots instead of loading other valuable contents. Then the POS is then very slow to work with.
+
+
+This module adds a field _has_image_ in product.template and will change the product image url to his default placeholder directly in the POS.
+
+Because there is only one url for this placeholder, you will have only one request for all the products with no images.
+
+Indeed, if the product has an image, it will load normally.
+
+Known issues
+============
+
+
+Updates
+=======
+	* Feb 2016 : First version
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/web/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed feedback `here <https://github.com/OCA/web/issues/new?body=module:%20web_switch_company_warning%0Aversion:%200.1%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+
+Credits
+=======
+
+Contributors
+------------
+
+* Hparfr <https://github.com/hparfr> (Akretion)[https://akretion.com]
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit http://odoo-community.org.

pos_default_empty_image/__init__.py

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+# -*- coding: utf-8 -*-

pos_default_empty_image/__openerp__.py

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+# -*- coding: utf-8 -*-
+# © <2015> <Akretion, OCA>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    'name': 'POS Default empty image',
+    'version': '8.0.0.1.0',
+    'category': 'Point Of Sale',
+    'summary': 'Optimise load time for products with no image',
+    'description': """
+POS Default empty Image
+=======================
+
+In the point of sale, trying to load known inexistant images is a waste of time.
+
+
+When you have 8000 products in your Point of Sale and most of them don't have images, 
+you are happy to save thousands of useless requests : the POS load way faster.
+
+Technical information
+=====================
+
+Each time the pos instantiate a product, it will add an
+<img src="/web/.... + imageId"> to DOM.
+The browser will trigger as many requests than there is different url.
+If you have many products, the browser will soon reach his limit of network connections to Odoo server and
+will wait for free slots instead of loading other valuable contents. 
+The POS is then very slow to work with.
+
+
+This module adds a field _has_image_ in product.template and will change 
+the product image url to his default placeholder directly in the POS.
+Because there is only one url for this placeholder, you will have only one request for all the products with
+no images.
+
+Indeed, if the product has an image, it will load normally.
+
+    """,
+    'author': "Akretion / Odoo Community Association (OCA)",
+    'website': "https://akretion.com",
+    'license': 'AGPL-3',
+    'depends': ['point_of_sale'],
+    'data': [ 'view/view.xml'],
+    'qweb': [],
+}

pos_default_empty_image/product.py

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+# -*- coding: utf-8 -*-
+# © <2015> <Akretion, OCA>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from openerp import models, fields, api
+
+class ProductTemplate(models.Model):
+    _inherit = ['product.template']
+    _name = 'product.template'
+
+    @api.multi
+    @api.depends('field.image')
+    def _has_image(self):
+        for record in self:
+            record.has_image = bool(record.image)
+
+    has_image = fields.Boolean(
+        compute='_has_image',
+        store=True,
+        readonly=True)

pos_default_empty_image/static/src/js/pos_default_empty_image.js

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+'use strict';
+
+openerp.pos_default_empty_image = function (instance) {
+	var module = instance.point_of_sale;
+	var _t = instance.web._t;
+
+	//don't try to get an image if we know the product ain't one
+	module.ProductListWidget = module.ProductListWidget.extend({
+		get_product_image_url: function(product){
+			if (product.has_image)
+				return this._super(product);
+
+			return '/web/static/src/img/placeholder.png';
+		}
+	});
+
+	//we can't extend it because self.pos not ready yet
+	var _initializePosModel_ = module.PosModel.prototype.initialize;
+	module.PosModel.prototype.initialize = function(session, attributes){
+		//add has_image to the request of product product
+		this.models.some(function (m, idx) {
+			if (m.model !== "product.product")
+				return false;
+
+			//check if not already done by someone else
+			if (m.fields.indexOf('has_image') === -1) {
+				m.fields.push('has_image');
+			}
+
+			return true; //no need to continue
+		});
+		return _initializePosModel_.call(this, session, attributes);
+	};
+};

pos_default_empty_image/view/view.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<openerp>
+    <data>
+        <template id="assets_backend" name="pos_default_empty_image assets" inherit_id="web.assets_backend">
+            <xpath expr="." position="inside">
+                <script type="text/javascript" src="/pos_default_empty_image/static/src/js/pos_default_empty_image.js"></script>
+            </xpath>
+        </template>
+    </data>
+</openerp>