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ABU K 
Delete one record ,I want to know here the usage of mapped..need a help.. what did this code exactly mainly 
mapped

@api.multi
def unlink(self):
    resources = self.mapped('resource_id')
    super(Employee, self).unlink()
    return resources.unlink()
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Palkesh Baraiya
Best Answer

Hello,

'mapped' provided function can be a string to get field values. so here 'mapped' get Value of 'resource_id' and unlink that value.

You can find in Detail from below link.

https://www.odoo.com/documentation/8.0/reference/orm.html


Thank You.


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ABU K
Autor Best Answer

This is what i am looking Tx STCKFLOW-

https://stackoverflow.com/questions/42228900/use-mapped-in-odoo-9

tx...

Basically it is a convenience method to return recordsets (lists of objects or values). Lets say you wanted a list of all partners email addresses matching a specific domain. You could easily accomplish this like so.

domain = [('email','not in',[False,None])]
records = self.env['res.partner'].search(domain)
email_list = records.mapped('email')

print(email_list)

>>> [u'john@gmail.com',u'suzy@gmail.com',u'bob@hotmail.com']

This way you do not need to do this

email_list = []
domain = [('email','not in',[False,None])]
for rec in self.env['res.partner'].search(domain):
    if rec.email: 
        email_list.append(rec.email) 
print(email_list)

>>> [u'john@gmail.com',u'suzy@gmail.com',u'bob@hotmail.com']

In the above example odoo would have iterated through all of the records and returned the email from each record in the form of a list.

So rather than looping through all records to obtain the same field from each record you can use mapped.

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