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main.py
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158 lines (121 loc) · 4.36 KB
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from pprint import pprint
from re import search
from argparse import ArgumentParser
from connect import session
from seed import TABLES
from models import Grade, Group, Student, Subject, Teacher
def create_action(**options: dict) -> None:
model: str = options['model']
relations = TABLES[model.lower() + 's'].get('relations', ())
if len(relations) > 1:
raise ValueError('Unsupported model.')
name = options['name']
cls = globals()[model]
if session.query(cls).filter(eval(f'{model}.name') == name).one_or_none():
raise ValueError('The name is already used.')
fields = {'name': name}
if relations:
id = options['id']
relation = relations[0][:-1]
sub_model = relation.title()
sub_cls = globals()[sub_model]
column = eval(f'{sub_model}.id')
if not session.query(sub_cls).filter(column == id).one_or_none():
raise ValueError(f'The {relation} is absent.')
fields[relation + '_id'] = options['id']
try:
session.add(cls(**fields))
session.commit()
except Exception as error:
raise error
else:
print(f'A new {model.lower()} has been added successfully.')
def list_action(**options: dict) -> None:
match options['model']:
case 'Grade':
query = (
session
.query(Grade.id, Student.name, Subject.name, Grade.value)
.select_from(Grade)
.join(Subject)
.join(Student)
.order_by(Student.name)
.order_by(Subject.name)
)
case 'Group':
query = session.query(Group.id, Group.name).order_by(Group.name)
case 'Student':
query = (
session
.query(Student.id, Student.name, Group.name)
.join(Group)
.order_by(Student.name)
)
case 'Subject':
query = (
session
.query(Subject.id, Subject.name, Teacher.name)
.join(Teacher)
.order_by(Subject.name)
)
case 'Teacher':
query = session.query(Teacher.id, Teacher.name) \
.order_by(Teacher.name)
pprint(query.all())
def update_action(**options: dict) -> None:
name = options['name']
id = options['id']
model: str = options['model']
cls = globals()[model]
model = model.lower()
column = cls.__dict__['id']
if not session.query(cls).filter(column == id).one_or_none():
raise ValueError(f'The {model} is absent.')
entity = session.query(cls).filter(column == id).one()
setattr(entity, TABLES[model + 's'].get('column', 'name'), name)
try:
session.add(entity)
session.commit()
except Exception as error:
raise error
else:
print(f'The {model} has been updated successfully.')
def remove_action(**options: dict) -> None:
id = options['id']
model: str = options['model']
cls = globals()[model]
if not session.query(cls).filter(cls.id == id).one_or_none():
raise ValueError(f'The {model.lower()} is already deleted.')
try:
session.delete(session.query(cls).filter(cls.id == id).one())
session.commit()
except Exception as error:
raise error
else:
print(f'The {model} has been deleted successfully.')
def main() -> None:
parser = ArgumentParser('CRUD')
parser.add_argument('-a',
'--action',
choices=[data.group(1) for name in globals()
if (data := search(r'^(.+)_action$', name))],
required=True)
parser.add_argument('-m',
'--model',
choices=[name[:-1].title() for name in TABLES.keys()],
required=True)
parser.add_argument('-n', '--name')
parser.add_argument('-i', '--id', type=int)
arguments = {key: value
for key, value in vars(parser.parse_args()).items()
if value is not None}
try:
globals()[arguments['action'] + '_action'](**arguments)
except KeyError as error:
print(f'The {str(error)[1:-1]} is mandatory.')
except ValueError as error:
print(error)
else:
session.close()
if __name__ == '__main__':
main()