How to operate a field depending on the stage?

Question

In proyects, in every task i have a "total float field", and i need to sum the totals of tasks and render it in the project view, but only the tasks that are in the stage "To do".
this is my code, but is not working.
@api.depends('tasks.sum_total_cost')
def todo_sum(self):
todo = self.env['project.task'].search([('stage_id', '=', 'To Do')])
for task in todo:
task.sum_todo= round(sum(task.mapped('sum_total_cost')), 2)

Kevin Cruz · Accepted Answer

You just need to apply the sum after filtering with the correct path.
Try this

@api.depends('tasks.sum_total_cost')
def todo_sum(self):
todo = self.env['project.task'].search([('stage_id', '=', 'To Do')])
for data in todo:
if data:
self.sum_todo = round(sum(todo.mapped('sum_total_cost')), 2)

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