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Correct way: Browse vs Search ?

Hi, I have found in official addons that even though a record has a reference to other records (like one2many), and they already have a browse record with the required information, the programmer still uses the search function to get the list of ids from the database. Example: Each `hr_employee` has a field `contract_ids`, that is a one2many relationship to `hr_contract`. If I already have employee_data = employee_obj.browse( blah, blah, blah...) and I want to access the list of contracts for that employee, what is the right way to get it: a) Use the list I already have on employee_data.contract_ids and get the information from there, or b) Execute a search on contract object looking for contracts related to the employee, like: contract_ids = obj_contract.search(cr, uid, [('employee_id','=',emp.id),], context=context) I would think option a), but I have found that in most cases option b) is used in official addons, so I guess there is a reason for that... What are cons and pros of each aproach ?

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