Magento getData() vs getFieldName() in model

Question

After load('id') function in model, we can get data by either model->getData('field_name') or model->getFieldName().

I know that both functions are provided by DataObject class but what I want to know is

1. Is there any different between them ?
2. What should I use ?

Answer 1

Yes there is a bit of different, model->getFieldName() is a magic method so this will be public and in Magento 2 we can create plugins to manipulate output of public methods

(i.e) Lets assume

• value of field_name is foo
• there is plugin(https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html) created which changes the value to bar
• model->getData('field_name') will return foo
• model->getFieldName() will return bar

It is always advisable to use model->getFieldName() so can take advantage of plugins in Magento 2.

I Hope this explanation helps.