MySQl/Laravel: check the changed column before updating the record

Question

I have a table abc which has several fields.

I need to fetch the column or columns (except: id , created_at & updated_at ) which have been updated and store the existing value along with the column name in a logs table corresponding to that selected record before updating it in that table.

For example:
Table: abc

id: 1
name: 'Old name'
mobile: 9876543210
address: 'Abc-123'
...
created_at: 'Sometime'
updated_at: 'Sometime'

update:
    name: 'new name'
    mobile: 1234567890

Table: logs should have

column | value
name   | Old name

column | value
mobile | 9876543210

However, I can save the entire record in the table, which will be lot easier, but that will just be the waste of space/memory. Also, it will be difficult to determine which value was exactly changed at that point of time without any algorithm.

Answer 1

isDirty() method is use to check if the model or any of the given attribute(s) have been modified.

it will return true if name chagned: $model->isDirty('name')

you can also get Old value using getOriginal() method

Ex  : $old_name = $model->getOriginal('name');

Reference: https://laravel.com/api/master/Illuminate/Database/Eloquent/Model.html#method_isDirty