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v7sequence
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Francesco OpenCode

I created a sequence for a class. This is the xml structure that create it:

    <record id="seq_type_report_review" model="ir.sequence.type">
        <field name="name">Report Review</field>
        <field name="code">management.reports_review</field>
    </record>

    <record id="seq_report_review" model="ir.sequence">
        <field name="name">Report Review</field>
        <field name="code">management.reports_review</field>
        <field name="prefix">%(year)s\</field>
        <field name="padding">3</field>
        <field name="company_id" eval="False"/>
    </record>

And this is the system I use to call the sequence in the class:

def create(self, cr, uid, vals, context=None):
    vals['review_number'] = self.pool.get('ir.sequence').get(cr, uid, 'management.reports_review') or ''
    return super(management_reports_review, self).create(cr, uid, vals, context)

If I create a new voice, the sequence increse by 1. It's ok for me but if I go in the Configuration section the next number voice is always on 1! Why? I would change it but if I change it the sequence go on with is old number.

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Brett Lehrer
Best Answer

Depends if you're using standard or no-gap sequence implementation. Check out this function in openerp/addons/base/ir/ir_sequence.py:

def _get_number_next_actual(self, cr, user, ids, field_name, arg, context=None):
    '''Return number from ir_sequence row when no_gap implementation,
    and number from postgres sequence when standard implementation.'''
    res = dict.fromkeys(ids)
    for element in self.browse(cr, user, ids, context=context):
        if  element.implementation != 'standard':
            res[element.id] = element.number_next
        else:
            # get number from postgres sequence. Cannot use
            # currval, because that might give an error when
            # not having used nextval before.
            statement = (
                "SELECT last_value, increment_by, is_called"
                " FROM ir_sequence_%03d"
                % element.id)
            cr.execute(statement)
            (last_value, increment_by, is_called) = cr.fetchone()
            if is_called:
                res[element.id] = last_value + increment_by
            else:
                res[element.id] = last_value
    return res

Using no-gap implementation, the current sequence should be listed directly in the table in ir_sequence. Otherwise, using something like pgAdmin, you can just look directly at the sequence value under "Sequences" -> "ir_sequence_<sequence id="">". Or, referring to that function, a SQL query like:

select last_value from ir_sequence_041;

Why you aren't seeing the updated number on the configuration page is odd. Something else must be going wrong there, but I don't know what. Using updated server source code?

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Rachid
Best Answer 
   odoo 8: 
modify the file odoo/openerp/addons/base/ir/ir_sequence.py as bellow
 

`
def _predict_nextval(self, cr, seq_id):
    """Predict next value for PostgreSQL sequence without consuming it"""
    # Cannot use currval() as it requires prior call to nextval()
    query = """SELECT last_value,
                      (SELECT increment_by
                       FROM pg_sequences
                       WHERE sequencename = 'ir_sequence_%(seq_id)s'),
                      is_called
               FROM ir_sequence_%(seq_id)s"""
    if cr._cnx.server_version < 100000:
        query = "SELECT last_value, increment_by, is_called FROM ir_sequence_%(seq_id)s"
    cr.execute(query % {'seq_id': seq_id})
    (last_value, increment_by, is_called) = cr.fetchone()
    if is_called:
        return last_value + increment_by
    # sequence has just been RESTARTed to return last_value next time
    return last_value


class ir_sequence(openerp.osv.osv.osv):

 def _get_number_next_actual(self, cr, user, ids, field_name, arg, context=None):
    '''Return number from ir_sequence row when no_gap implementation,
    and number from postgres sequence when standard implementation.'''
    res = dict.fromkeys(ids)
    for element in self.browse(cr, user, ids, context=context):
        if element.implementation != 'standard':
            res[element.id] = element.number_next
        else:
            # get number from postgres sequence. Cannot use
            # currval, because that might give an error when
            # not having used nextval 
            
            seq_id = "%03d" % element.id
            res[element.id] = _predict_nextval(self, cr, seq_id)
    return res
`
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