484 lines
15 KiB
Python
484 lines
15 KiB
Python
from __future__ import annotations
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import typing
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from typing import Any, Dict, List, Optional, Tuple, Type, Union
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from django.db import models
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from django.db.models import Q
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from .fluent import FluentQuery
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class classproperty:
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def __init__(self, func):
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self.fget = func
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def __get__(self, obj, objtype=None):
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return self.fget(objtype if objtype is not None else type(obj))
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ABBREVIATIONS = {
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'uuid': 'UUID',
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'id': 'ID',
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'ip': 'IP',
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'url': 'URL',
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'uri': 'URI',
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'api': 'API',
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'html': 'HTML',
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'css': 'CSS',
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'js': 'JS',
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'json': 'JSON',
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'xml': 'XML',
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'sql': 'SQL',
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'http': 'HTTP',
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'https': 'HTTPS',
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'smtp': 'SMTP',
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'ssl': 'SSL',
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'tls': 'TLS',
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'ssh': 'SSH',
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'ftp': 'FTP',
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'2fa': '2FA',
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'elt': 'ELT',
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'sve': 'SVE',
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't4': 'T4',
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'mc': 'MC',
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'crb': 'CRB',
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'ccgo': 'CCGO',
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'ugm': 'UGM',
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'gerp': 'GERP',
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'abac': 'ABAC',
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'rbac': 'RBAC',
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'smtm': 'SMTM',
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'pwd': 'PWD',
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}
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def snake_to_pascal(name):
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if '_' not in name:
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return name[0].upper() + name[1:] if name else name
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parts = name.split('_')
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result = []
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for p in parts:
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lower = p.lower()
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if lower in ABBREVIATIONS:
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result.append(ABBREVIATIONS[lower])
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else:
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result.append(p.capitalize())
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return ''.join(result)
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def pascal_to_snake(name):
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import re
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s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
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s2 = re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1)
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parts = s2.lower().split('_')
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return '_'.join(parts)
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class _InvertedFieldExpression:
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def __init__(self, field_expr):
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self._field_expr = field_expr
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def startswith(self, value):
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return ~Q(**{f'{self._field_expr._django_name}__startswith': value})
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def contains(self, value):
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return ~Q(**{f'{self._field_expr._django_name}__contains': value})
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def like(self, pattern):
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clean = pattern.strip('%')
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return ~Q(**{f'{self._field_expr._django_name}__icontains': clean})
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def in_(self, values):
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return ~Q(**{f'{self._field_expr._django_name}__in': values})
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def is_(self, other):
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if other is None:
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return ~Q(**{f'{self._field_expr._django_name}__isnull': True})
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return ~Q(**{self._field_expr._django_name: other})
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class FieldExpression:
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_resolve_cache = {}
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def __init__(self, model_class, field_name):
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self.model_class = model_class
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self.field_name = field_name
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self._django_name = self._resolve_django_name()
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def _resolve_django_name(self):
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cache_key = (self.model_class.__name__, self.field_name)
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if cache_key in FieldExpression._resolve_cache:
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return FieldExpression._resolve_cache[cache_key]
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if hasattr(self.model_class, '_meta'):
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for f in self.model_class._meta.local_fields:
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if f.name == self.field_name:
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FieldExpression._resolve_cache[cache_key] = f.name
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return f.name
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FieldExpression._resolve_cache[cache_key] = self.field_name
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return self.field_name
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def __eq__(self, other):
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if isinstance(other, FieldExpression):
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return NotImplemented
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if other is None:
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return Q(**{f'{self._django_name}__isnull': True})
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return Q(**{self._django_name: other})
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def __ne__(self, other):
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if isinstance(other, FieldExpression):
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return NotImplemented
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return ~Q(**{self._django_name: other})
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def __gt__(self, other):
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return Q(**{f'{self._django_name}__gt': other})
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def __ge__(self, other):
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return Q(**{f'{self._django_name}__gte': other})
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def __lt__(self, other):
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return Q(**{f'{self._django_name}__lt': other})
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def __le__(self, other):
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return Q(**{f'{self._django_name}__lte': other})
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def __getitem__(self, key):
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return _JsonKeyExpression(self._django_name, key)
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def __hash__(self):
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return hash((self.model_class.__name__, self.field_name))
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def __and__(self, other):
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if isinstance(other, Q):
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return Q(self) & other
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return NotImplemented
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def __or__(self, other):
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if isinstance(other, Q):
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return Q(self) | other
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return NotImplemented
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def __invert__(self):
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return _InvertedFieldExpression(self)
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def is_(self, other):
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if other is None:
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return Q(**{f'{self._django_name}__isnull': True})
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return Q(**{self._django_name: other})
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def is_not(self, other):
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if other is None:
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return Q(**{f'{self._django_name}__isnull': False})
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return ~Q(**{self._django_name: other})
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def like(self, pattern):
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clean = pattern.strip('%')
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return Q(**{f'{self._django_name}__icontains': clean})
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def contains(self, value):
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return Q(**{f'{self._django_name}__contains': value})
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def ilike(self, pattern):
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return self.like(pattern)
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def startswith(self, value):
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return Q(**{f'{self._django_name}__startswith': value})
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def istartswith(self, value):
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return Q(**{f'{self._django_name}__istartswith': value})
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def endswith(self, value):
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return Q(**{f'{self._django_name}__endswith': value})
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def iendswith(self, value):
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return Q(**{f'{self._django_name}__iendswith': value})
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def in_(self, values):
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if hasattr(values, '_qs'):
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return Q(**{f'{self._django_name}__in': values._qs.values(self._django_name)})
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return Q(**{f'{self._django_name}__in': values})
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def between(self, low, high):
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return Q(**{f'{self._django_name}__gte': low}) & Q(**{f'{self._django_name}__lte': high})
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def regex(self, pattern):
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return Q(**{f'{self._django_name}__regex': pattern})
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def iregex(self, pattern):
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return Q(**{f'{self._django_name}__iregex': pattern})
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def desc(self):
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return f'-{self._django_name}'
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def asc(self):
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return self._django_name
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def __repr__(self):
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return f'FieldExpr({self.model_class.__name__}.{self.field_name})'
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def __str__(self):
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return self._django_name
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class _JsonKeyExpression:
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def __init__(self, field_name, key):
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self.field_name = field_name
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self.key = key
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def _lookup(self, suffix=''):
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if suffix:
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return f'{self.field_name}__{self.key}__{suffix}'
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return f'{self.field_name}__{self.key}'
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def cast(self, type_hint):
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return _CastJsonExpression(self.field_name, self.key, type_hint)
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def __eq__(self, other):
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return Q(**{self._lookup(): other})
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def __ne__(self, other):
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return ~Q(**{self._lookup(): other})
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def __gt__(self, other):
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return Q(**{self._lookup('gt'): other})
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def __ge__(self, other):
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return Q(**{self._lookup('gte'): other})
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def __lt__(self, other):
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return Q(**{self._lookup('lt'): other})
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def __le__(self, other):
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return Q(**{self._lookup('lte'): other})
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def between(self, low, high):
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return Q(**{self._lookup('gte'): low}) & Q(**{self._lookup('lte'): high})
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def __repr__(self):
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return f'JsonKeyExpr({self.field_name}[{self.key!r}])'
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class _CastJsonExpression:
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def __init__(self, field_name, key, type_hint):
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self.field_name = field_name
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self.key = key
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self.type_hint = type_hint
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def _lookup(self, suffix=''):
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if suffix:
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return f'{self.field_name}__{self.key}__{suffix}'
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return f'{self.field_name}__{self.key}'
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def between(self, low, high):
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return Q(**{self._lookup('gte'): low}) & Q(**{self._lookup('lte'): high})
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def __eq__(self, other):
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return Q(**{self._lookup(): other})
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def __ne__(self, other):
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return ~Q(**{self._lookup(): other})
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def __gt__(self, other):
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return Q(**{self._lookup('gt'): other})
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def __ge__(self, other):
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return Q(**{self._lookup('gte'): other})
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def __lt__(self, other):
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return Q(**{self._lookup('lt'): other})
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def __le__(self, other):
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return Q(**{self._lookup('lte'): other})
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def __repr__(self):
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type_name = getattr(self.type_hint, '__name__', str(self.type_hint))
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return f'CastJsonExpr({self.field_name}[{self.key!r}]->{type_name})'
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class ForeignKeyIdDescriptor:
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"""FK 字段描述符：类级别访问返回 FieldExpression，实例级别访问/设置委托给原始 Django 字段。"""
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def __init__(self, fk_name):
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self.fk_name = fk_name
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self.id_attr = fk_name + '_id'
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self._original_field = None # 延迟绑定原始 Django 字段
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def _get_original_field(self, owner):
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if self._original_field is None:
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try:
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self._original_field = owner._meta.get_field(self.fk_name)
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except Exception:
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pass
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return self._original_field
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def __get__(self, obj, objtype=None):
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if obj is None:
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return FieldExpression(objtype, self.id_attr)
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return getattr(obj, self.id_attr)
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def __set__(self, obj, value):
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# 直接写入实例 __dict__，避免触发描述符递归
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obj.__dict__[self.id_attr] = value
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class FieldExpressionDescriptor:
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"""普通字段描述符：类级别访问返回 FieldExpression，实例级别访问/设置委托给原始 Django 字段。"""
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def __init__(self, field_name):
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self.field_name = field_name
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self._original_field = None # 延迟绑定原始 Django 字段
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def _get_original_field(self, owner):
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if self._original_field is None:
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try:
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self._original_field = owner._meta.get_field(self.field_name)
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except Exception:
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pass
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return self._original_field
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def __get__(self, obj, objtype=None):
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if obj is None:
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return FieldExpression(objtype, self.field_name)
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# 实例级别：从 __dict__ 获取，或让 Django 字段描述符处理
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if self.field_name in obj.__dict__:
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return obj.__dict__[self.field_name]
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# 委托给原始 Django 字段
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orig = self._get_original_field(objtype)
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if orig is not None:
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return orig.__get__(obj, objtype)
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return getattr(obj, self.field_name)
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def __set__(self, obj, value):
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# 直接写入实例 __dict__，避免触发描述符递归
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obj.__dict__[self.field_name] = value
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class QModelBase(models.base.ModelBase):
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def __new__(mcs, name, bases, namespace, **kwargs):
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# 不再强制设置 db_column —— Django 会自动处理
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# 动态设置 managed：子服务器可设 GVSDSDK_MANAGE_TABLES=True 让 gvsdsdk 管理表
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meta = namespace.get('Meta')
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if meta and getattr(meta, 'app_label', None) == 'gvsdsdk':
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try:
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from django.conf import settings
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if getattr(settings, 'GVSDSDK_MANAGE_TABLES', False):
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meta.managed = True
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except Exception:
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pass
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cls = super().__new__(mcs, name, bases, namespace, **kwargs)
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# 模型创建后，包装字段描述符以支持类级别 FieldExpression
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if not cls._meta.abstract:
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_wrap_field_descriptors(cls)
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return cls
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def _wrap_field_descriptors(cls: Type) -> None:
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"""包装 Django 字段描述符，使类级别访问返回 FieldExpression，
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实例级别完全委托给 Django 原生描述符。
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Django 的字段描述符（DeferredAttribute / ForwardManyToOneDescriptor）：
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- __get__(None, cls) → 返回字段对象本身（类级别）
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- __get__(instance, cls) → 返回字段值（实例级别）
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我们包装后：
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- __get__(None, cls) → 返回 FieldExpression（类级别，用于链式 OOP）
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- __get__(instance, cls) → 委托给原生描述符（实例级别，正常行为）
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"""
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from django.db.models.query_utils import DeferredAttribute
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from django.db.models.fields.related_descriptors import (
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ForwardManyToOneDescriptor,
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ForwardOneToOneDescriptor,
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)
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for field in cls._meta.local_fields:
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fname = field.name
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if fname.startswith('_'):
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continue
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original_desc = cls.__dict__.get(fname)
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if original_desc is None:
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continue
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# 只包装已知的 Django 描述符类型
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if isinstance(original_desc, (DeferredAttribute, ForwardManyToOneDescriptor,
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ForwardOneToOneDescriptor)):
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wrapper = _FieldExpressionWrapper(original_desc, cls, fname)
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setattr(cls, fname, wrapper)
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class _FieldExpressionWrapper:
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"""包装 Django 字段描述符，类级别返回 FieldExpression，实例级别委托给原生描述符。"""
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def __init__(self, original_descriptor, model_class, field_name):
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self._original = original_descriptor
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self._model = model_class
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self._field_name = field_name
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self._has_set = hasattr(original_descriptor, '__set__')
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def __get__(self, obj, objtype=None):
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if obj is None:
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# 类级别访问：返回 FieldExpression
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return FieldExpression(self._model, self._field_name)
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# 实例级别访问：委托给原生 Django 描述符
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return self._original.__get__(obj, objtype)
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def __set__(self, obj, value):
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if self._has_set:
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# FK/O2O 描述符有 __set__
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self._original.__set__(obj, value)
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else:
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# 普通字段（DeferredAttribute）没有 __set__，直接写 __dict__
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obj.__dict__[self._field_name] = value
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class QModel(models.Model, metaclass=QModelBase):
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"""QModel 兼容层基类，提供 SQLAlchemy 风格的链式 OOP 查询接口。
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所有继承 QModel 的模型自动获得：
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- ``Model.query`` : 返回 FluentQuery，支持链式查询
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- ``Model.field_name`` : 类级别访问返回 FieldExpression，支持表达式查询
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- ``Model.field_name`` : 实例级别访问返回字段值（与普通 Django Model 一致）
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用法示例::
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# 链式查询
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orders = Dingdan.query.filter(zhuangtai=8).order_by('-create_time').to_list()
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# 字段表达式
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Dingdan.query.filter(Dingdan.jine > 100, Dingdan.zhuangtai.in_([1,2,3]))
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# 聚合
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Dingdan.query.aggregate(total=Sum('jine'))
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# values / annotate
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Dingdan.query.values('zhuangtai').annotate(cnt=Count('id'))
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# 分页
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Dingdan.query.paginate(page=1, per_page=20)
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"""
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class Meta:
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abstract = True
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@classproperty
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def query(cls) -> FluentQuery:
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"""返回 FluentQuery 兼容层查询构建器，支持链式 OOP 查询。"""
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return FluentQuery(cls)
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@classmethod
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def __class_getitem__(cls, item) -> FluentQuery:
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"""支持 Model[condition] 语法，返回 filter 后的 FluentQuery。
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用法::
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Dingdan[Dingdan.zhuangtai == 8].order_by('-create_time').to_list()
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"""
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if isinstance(item, Q):
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return cls.query.filter(item)
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if isinstance(item, dict):
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return cls.query.filter(**item)
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return cls.query.filter(item)
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