Copying fallower Ids.

[Grfokpr]

I need to copy fallower_ids from project.project to project.task.
my method looks like this but it's not working. any suggestions how would you do this.

@api.multi
def add_project_followers(self):
for task in self:
partner_ids = task.project_id.message_follower_ids.ids
task.message_subscribe(partner_ids)

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[iledarn]

@Grfokpr ,
Your odoo version is 10.0, right?
Maybe this article about message subtypes helps you:
https://odoo-development.readthedocs.io/en/latest/odoo/models/mail.message.html

Your code looks right for me but for missing indentation.
And what you have in odoo logs (may copy-paste it here)?

[Grfokpr]

@iledarn
I do try to use this method as button but i'm getting
"The operation cannot be completed, probably due to the following:

• deletion: you may be trying to delete a record while other records still reference it
• creation/update: a mandatory field is not correctly set

[object with reference: Partner - res.partner]"
Validation Error.