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Posts Tagged ‘Programming’

How to debug your OpenERP modules

Debugging your OpenERP modules is quite straightforward, as long as you know basic Python programming. Just insert the following line in your

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module:

import pdb;pdb.set_trace()

Then restart your openerp-server with the —debug option

# openerp-server –debug

Then monitor your server console. You will see your server stop and show you a command line prompt where you will be able to debug your program.
You will find further information in the Python documentation website.

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Calculating a product cost with OpenERP

Last week I had the opportunity to try a very useful module that, IMHO, should be included in OpenERP core. This module is product_extended and can be found in the extras repository, you can download it with the following command:

#  bzr branch lp:openobject-addons/extra-6.0

This module does many things, among them shows the product last order for a supplier and its date. But what is really interesting is that it calculates a product cost based on its Bill of Materiales. In order to do that, first you need to check the “Compute Standard Price” check box in the product form,

Then, you can either click on the “Compute Standard Price” button or check it in the product bill of materials (a product can have more than one bill of materials). In the latter, you can find the product information on the Bill of Materials form.

You can calculate the standard price by clicking on the “Compute Standard Price” wizard on the right of the BoM form. How is this cost calculated? This is the interesting part, it takes into account the product cost of each product, plus the hours and cycle costs of every workcenter that is involved in its routing. A very useful module.

It needs a minor change in order to make it work with OpenERP 6.1 but you should try it, I highly recommend it

Cheers!

Managing your openerp processes with Supervisor

Reading a book on system administration with Python I found Supervisor, which is a tool that allows you manage your programs. I found it easy to

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install and learn, and in minutes I had it running in my system. After reading the documentation, which took me minutes, I was able to configure its configuration file, restart the daemon and have openerpserver and openerp-web running automatically in my computer.

Below is am example of how to modify the supervisord.conf file in order to start openerp-server and openerp-web

[program:openerp-server]
command=/usr/local/bin/openerp-server
user=gustavo

[program:openerp-web]
command=/usr/local/bin/openerp-web

Why I like it? Because this tool allows me to manage my process and it does not take me long to do that. It can also be controlled by other Python programs, which might be handy in some projects.

Cheers!

ABC Analysis in OpenERP

December 26, 2011 Leave a comment

ABC analysis is very well covered in this Wikipedia article. So no point of talking about it again here. Thing is, how do you implement it in OpenERP.

Polish OpenERP screenshot

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Truth is, it is not a great deal. You only need to pull the sale order lines for the past six months (for example, could be a year as well or the period under analysis), then by product summarize its sales (not taking into account any discounts) and then divide the sales number by the total sales amount, in order to figure out the product ABC Category. If you are an experienced programmer or data analyst, you can do this in minutes. If not, does not take long to figure out how to query the OpenERP database.

Thing is, this information is not integrated into OpenERP yet (and it makes sense, since you do not need this information for the MRP application. It’s nice to have it, but it is not critical). So I created a module that regularly categorizes OpenERP products according to its sales. I have not finished it yet and I need to upload it to LaunchPad, but I think I will do it this week.

What does this module do? Allows you to create ABC categories (you can have as many as you want) where you define the category and its range. Then regularly (as an scheduler action) categorizes the products taking into account their sales lines. Then updates the product abc_category field (created previously by the module installer).

I still need to polish the module and add a couple of files, such as a XML file with initial information (specially for the scheduler and categories). As soon as I get it done, I will upload it to LaunchPad and publish it.

Cheers!!!!

Importing products with web-services in OpenERP

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Yesterday someone at the OpenERP forum asked me for an example of how to import product data into OpenERP, so here it is, below you will find an example of a Python script for loading basic product data.

#!/usr/bin/env python
# coding: utf-8

import xmlrpclib
import csv

username = ‘admin’ #the user
pwd = ‘pwd_admin’ #the password of the user
dbname = ‘blog_db’ #the database

# Get the uid
sock_common = xmlrpclib.ServerProxy (‘http://localhost:8069/xmlrpc/common’)
uid = sock_common.login(dbname, username, pwd)

#replace localhost with the address of the server
sock = xmlrpclib.ServerProxy(‘http://localhost:8069/xmlrpc/object’)

#load categories first
filename = “categories.csv”
reader = csv.reader(open(filename,”rb”))
for row in reader:
category = {
‘name’: row[1],
‘active’: True,
}
category_id = sock.execute(dbname, uid, pwd, ‘res.partner.category’, ‘create’, category)
print category_id

print “End categories load”

filename = “product_template.csv”
reader = csv.reader(open(filename,”rb”))
for row in reader:
product_template = {
‘name’: row[0].rstrip(),
‘supply_method’:’produce’,
‘standard_price’:1,
‘mes_type’:’fixed’,
‘uom_id’:1,
‘uom_po_id’:1,
‘type’:’product’,
‘procure_method’:’make_to_stock’,
‘cost_method’:’standard’,
‘categ_id’:1}
template_id = sock.execute(dbname, uid, pwd, ‘product.template’, ‘create’, product_template)
print template_id

product_product = {
‘product_tmpl_id’:template_id,
‘default_code’: row[0].rstrip(),
‘active’: True,
}
product_id = sock.execute(dbname,uid,pwd,’product.product’,’create’,product_product)
print product_product

print “End product load”

This is a simple script you can execute from the command line. In summary, first you need to create the categories and then you need to create the product.template objects and product.product objects. If you have any question about this, please let me know.

Cheers!

Loading data in OpenERP with XML-RPC Web services

Architectural elements involved in the XML-RPC.

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Loading data from an external source into OpenERP is quite straight-forward. Before trying ETL tools (such as Talend and Kettle), you should try two things first. Understand OpenERP’s object model (you can do it in the customization menu or by reading the code), and then try it with Python.

Trying the data load with Python is quite easy. First, open the Python prompt. Then try an example, the best example is OpenERP’s XML-RPC Web services documentation itself. I mean, start your openerp-server, then line by line try the example. You will see how it works and how easy it is to load data with web services. Then, I would suggest reading the CSV Python module documentation, which explains how to read a CSV file. After that, you only need to put the pieces together, create a Python program that reads the information from a CSV file (which was exported from LibreOffice) and then l0ad that data into OpenERP with web services.

Cheers,

openerp-server 5.0 and Python 2.7

Ubuntu Inside

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After upgrading Ubuntu to 11.04 I found the nasty surprise that openerpserver 5.0 could not create a new database because it threw the following error message:

ValueError: opcode JUMP_IF_FALSE_OR_POP not allowed (u’auto_picking and test_auto_picking()’)

After doing some quick research with Google, I found the following bug that is already fixed in openerp-server v6:

https://bugs.launchpad.net/openobject-server/+bug/673773

Since upgrading to openerp v6 at this time is not an option for me, I only needed to make a slight change to make openerp-server work with Python 2.6. I already had python 2.6 installed in my Ubuntu system, which I could check with the following command:

gustavo@gustavo-laptop:/usr/bin$ python2.6
Python 2.6.6 (r266:84292, Mar 25 2011, 19:36:32)
[GCC 4.5.2] on linux2
Type “help”, “copyright”, “credits” or “license” for more information.
>>>

Then I changed the openerp-server command at my /usr/local/bin directory. I only needed to change the

exec /usr/bin/python ./openerp-server.py $@

line to

exec /usr/bin/python2.6 ./openerp-server.py $@

And that is all I needed to do to get my system back to work

Cheers!