def do_destroy(self, args):
"""
Deletes an instance and saves the changes into JSON file
Usage: destroy [class name] [id]
"""
if not args: # if no arguments are passed
print("** class name missing **")
return
try: # testing arguments
cls_name, cls_id = args.split(' ')
obj_constructor(cls_name)
except ValueError: # test for second argument
print("** instance id missing **")
return
except NameError: # test if class exist
print("** class doesn't exist **")
return
inst = cls_name + '.' + cls_id
if inst in storage.all(): # check if instance exist
del storage.all()[inst] # delete obj
storage.save() # save changes into JSON file
self.__instances = storage.all() # update inst for autocomplete
else:
print("** no instance found **")
return
def do_show(self, args):
"""
Prints the string representation of an instance
Usage: show [class name] [id]
"""
if not args: # if no arguments are passed
print("** class name missing **")
return
try: # testing arguments
cls_name, cls_id = args.split(' ')
obj_constructor(cls_name)
except ValueError: # test for second argument
print("** instance id missing **")
return
except NameError: # test if class exist
print("** class doesn't exist **")
return
inst = cls_name + '.' + cls_id
instances = storage.all()
if inst in instances: # check if instance exist
print(instances[inst]) # get obj
else:
print("** no instance found **")
return
def do_all(self, cls_name):
"""
Prints all string representation of all or class instances
Usage: all [(class name)]
"""
result = ['[']
trigger = 0 if cls_name else 1 # if optional argument was passed
if not trigger:
try: # check if class exist
obj_constructor(cls_name)
except:
print("** class doesn't exist **")
return
for obj in storage.all().values():
if trigger or obj.__class__.__name__ == cls_name:
result.append(str(obj) + '\n')
result = "".join(result)
if len(result) == 1: # if no instances exist, send empty '[]'
result += ']'
print(result[:-1] + ']') # last '\n' will be overwritten with ']'
def do_update(self, args):
"""
Updates an instance based on the class name and id
Usage: update <class name> <id> <attribute name> "<attribute value>"
"""
if not args: # testing arguments are passed
print("** class name missing **")
return
args = args.split()
if len(args) >= 1:
try: # testing `class` argument
obj_constructor(args[0])
except NameError as error:
print("** class doesn't exist **")
return
else:
print("** class name missing **")
if len(args) < 2: # testing `id` argument
print("** instance id missing **")
return
else:
inst = args[0] + '.' + args[1] # `class.id`
instances = storage.all()
if inst in instances: # get obj
obj = instances[inst]
else:
print("** no instance found **")
return
if len(args) < 3: # testing `attribute` argument
print("** attribute name missing **")
return
elif args[2] in "id, created_at, updated_at": # shouldnt modify
return
else:
if len(args) < 4: # testing `value` argument
print("** value missing **")
return
else: # strip the quotes
args[3] = args[3].strip('\"')
try:
setattr(obj, args[2], args[3]) # update instance
except TypeError:
print("** Invalid value type for respective key **")
obj.save() # save updated obj
return
def do_create(self, cls_name):
"""
Creates a new instance of `BaseModel`
Usage: create [class name]
"""
if not cls_name:
print("** class name missing **")
else:
try: # test if class exist
instance = obj_constructor(cls_name, 1)
except NameError:
print("** class doesn't exist **")
else:
print(instance.id)
instance.save() # save instance to JSON file
self.__instances = storage.all() # update inst autocomplete
return