Changing the information before serialization

I have a database model like:-

class Script(db.Model):
   path = db.Column(db.String(50))

and a serializer like:-

class ScriptSchema(ma.Schema):
   class Meta:
      fields = (
          'path'
   )

My question is that when I dump the data after querying:-

all_scripts_orm = Script.query.all()
all_scripts = ScriptSchema(many=True).dump(all_scripts_orm)

I get data in the form of

[
   {"path": "Sample_folder/Sample_Script_1.txt"},
   {"path": "Sample_folder/Sample_script_2.txt"}
]

But I want to be able to do extract only the name of the script and serialize it

[
    {"path": "Sample_script_1.txt"},
    ...
]

How do I approach this problem as I don't want to make another column just for name in the Script Model ?

Use a Function field, documentation example here and documented here. For example:

from os import path as op

class ScriptSchema(ma.Schema):
   class Meta:
      fields = (
          'path'
   )

   path = fields.Function(lambda obj: op.basename(obj.path))