How can I mark a field "unique" in a custom model?

Question

When I create a custom model in the web GUI, how can I mark a field as "unique", so that the database will never create a second row with the same field value?

Ray Carnes · Accepted Answer

You can only do this when you create your field via Python.

See https://accounts.openerp.com/forum/Help-1/question/16386 [1]

_sql_constraints = [
('field_unique',
'unique(field)',
'Choose another value - it has to be unique!')
]

Note that if there are existing records for the model in the database, then any field values have to be unique, or this will fail and OpenERP will do nothing to enforce the constraint for new records.

[1] https://accounts.openerp.com/forum/Help-1/question/16386

Thierry Godin · Answer

Hi,
add a sql constraint to your model :
_sql_constraints = [
('uniq_name', 'unique(stuff_name)', "A stuff already exists with this name . Stuff's name must be unique!"),
]
Best regards

Prakash Bhadiyatar · Answer

_sql_constraints = [
('uniq_name', 'unique(your_field_name)', "You Entered data is already exists with this name. Please give data must be unique!"),
]

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