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What is the correct format to use Unique in sql_constrait in OpenERP?

Tintu Mon
on 7/20/15, 5:47 AM 2,693 views

I have tried unique sql_constaints using two different methods using flower brackets {} or square brackets [].

Both works fine.

Which one is correct?

_sql_constraints = {

('email_uniq', 'unique(email)', ' Please enter Unique Email id.')



_sql_constraints = [

('email_uniq', 'unique(email)', ' Please enter Unique Email id.')


P.S: But when I want to use more than a single constraint it only accepting square brackets [] like this.

_sql_constraints = [

('email_uniq', 'unique(email)', ' Please enter Unique Email id.')

('contact_uniq', 'unique(contact)', ' Please enter Unique Mobile no.')


What is the reason behind it.


Dhinesh - Technical Consultant, Sodexis Inc

--Dhinesh - Technical Consultant, Sodexis Inc--
| 5 4 9
Pondicherry, India
--Dhinesh - Technical Consultant, Sodexis Inc--

Passionate coder in Python/OpenERP. Knows Django/Flask MVC frameworks. Did code in Java, PHP.

Contact me at: dvdhinesh.mail@gmail.com

Dhinesh - Technical Consultant, Sodexis Inc
On 7/21/15, 6:40 AM

The _add_sql_constraints method is responsible for adding/removing constraints in postgres table/column whenever you install or upgrade module. Below is the sample code for that method

 def _add_sql_constraints(self, cr):
    for (key, con, _) in self._sql_constraints:
    conname = '%s_%s' % (self._table, key)

In python, we call {()} -> set of tuple, [()] -> list of tuple.

The above mentioned method will look only for iteration no matter what set of tuples or list of tuples. So both the format you mentioned above will work. But you need to stick with the standard list of tuples because set will remove duplicates.


a = [('a','b','c'), ('a','b','c')]
print a
b = {('a','b','c'), ('a','b','c')}
print b


Drees Far

--Drees Far--
| 5 2 6
Tunis, Tunisia
--Drees Far--
Drees Far
On 7/20/15, 6:00 AM

Here is an example:

_sql_constraints = [

('convention_prime_id_unique', 'UNIQUE(convention_id,prime_id)',

'Each convention has its unique primes'),


You have to use [].

And if you have more than one, you should do like this:

_sql_constraints = [

('prime_id_unique', 'UNIQUE(company_ids,company_convention_prime_id)',

'Each prime_id is unique'),


_sql_constraints = [

('company_convention_id_unique', 'UNIQUE(company_convention_prime_id,prime_id)',

'Each company_ids must have its own prime_id'),


PS: Those are examples in a module that i have created and it works perfectly :)

Try it and please vote if its fine ;)

Here is a useful link: http://blog.octo.com/en/first-steps-with-openerp/

Drees Far
on 7/20/15, 6:04 AM

But I found this : _sql_constraints = [ ('name_uniq', 'unique (name)', 'The name of the country must be unique !'), ('code_uniq', 'unique (code)', 'The code of the country must be unique !') ] for using multiple number of sql_constraints. I think you're wrong.

Tintu Mon
on 7/20/15, 6:16 AM

I am not wrong because i gave you an example that functions correctly in my session.

Drees Far
on 7/21/15, 7:25 AM

Okay, sorry. I mean that, _sql_constraints are created in both the way by using [] or {}. I didn't means to say you're wrong.

Tintu Mon
on 7/21/15, 7:53 AM

Its not a problem friend ;) The essential thing is that you understand it and you get the way to solve your problem and increase your knowledge in the ODOO world :) Nice Chance!!!!

Drees Far
on 7/22/15, 5:41 AM

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Asked: 7/20/15, 5:47 AM
Seen: 2693 times
Last updated: 9/9/15, 2:43 AM