我们从Python开源项目中，提取了以下9个代码示例，用于说明如何使用django.db.models.values()。
def __init__(self, real_apps, models, ignore_swappable=False): # Any apps in self.real_apps should have all their models included # in the render. We don't use the original model instances as there # are some variables that refer to the Apps object. # FKs/M2Ms from real apps are also not included as they just # mess things up with partial states (due to lack of dependencies) self.real_models = [] for app_label in real_apps: app = global_apps.get_app_config(app_label) for model in app.get_models(): self.real_models.append(ModelState.from_model(model, exclude_rels=True)) # Populate the app registry with a stub for each application. app_labels = {model_state.app_label for model_state in models.values()} app_configs = [AppConfigStub(label) for label in sorted(real_apps + list(app_labels))] super(StateApps, self).__init__(app_configs) self.render_multiple(list(models.values()) + self.real_models) # There shouldn't be any operations pending at this point. from django.core.checks.model_checks import _check_lazy_references ignore = {make_model_tuple(settings.AUTH_USER_MODEL)} if ignore_swappable else set() errors = _check_lazy_references(self, ignore=ignore) if errors: raise ValueError("\n".join(error.msg for error in errors))
def __init__(self, real_apps, models, ignore_swappable=False): # Any apps in self.real_apps should have all their models included # in the render. We don't use the original model instances as there # are some variables that refer to the Apps object. # FKs/M2Ms from real apps are also not included as they just # mess things up with partial states (due to lack of dependencies) self.real_models = [] for app_label in real_apps: app = global_apps.get_app_config(app_label) for model in app.get_models(): self.real_models.append(ModelState.from_model(model, exclude_rels=True)) # Populate the app registry with a stub for each application. app_labels = {model_state.app_label for model_state in models.values()} app_configs = [AppConfigStub(label) for label in sorted(real_apps + list(app_labels))] super(StateApps, self).__init__(app_configs) self.render_multiple(list(models.values()) + self.real_models) # There shouldn't be any operations pending at this point. pending_models = set(self._pending_operations) if ignore_swappable: pending_models -= {make_model_tuple(settings.AUTH_USER_MODEL)} if pending_models: raise ValueError(self._pending_models_error(pending_models))
def __init__(self, real_apps, models, ignore_swappable=False): # Any apps in self.real_apps should have all their models included # in the render. We don't use the original model instances as there # are some variables that refer to the Apps object. # FKs/M2Ms from real apps are also not included as they just # mess things up with partial states (due to lack of dependencies) self.real_models = [] for app_label in real_apps: app = global_apps.get_app_config(app_label) for model in app.get_models(): self.real_models.append(ModelState.from_model(model, exclude_rels=True)) # Populate the app registry with a stub for each application. app_labels = {model_state.app_label for model_state in models.values()} app_configs = [AppConfigStub(label) for label in sorted(real_apps + list(app_labels))] super(StateApps, self).__init__(app_configs) # The lock gets in the way of copying as implemented in clone(), which # is called whenever Django duplicates a StateApps before updating it. self._lock = None self.render_multiple(list(models.values()) + self.real_models) # There shouldn't be any operations pending at this point. from django.core.checks.model_checks import _check_lazy_references ignore = {make_model_tuple(settings.AUTH_USER_MODEL)} if ignore_swappable else set() errors = _check_lazy_references(self, ignore=ignore) if errors: raise ValueError("\n".join(error.msg for error in errors))
def clone(self): """ Return a clone of this registry, mainly used by the migration framework. """ clone = StateApps([], {}) clone.all_models = copy.deepcopy(self.all_models) clone.app_configs = copy.deepcopy(self.app_configs) # Set the pointer to the correct app registry. for app_config in clone.app_configs.values(): app_config.apps = clone # No need to actually clone them, they'll never change clone.real_models = self.real_models return clone
def __init__(self, real_apps, models, ignore_swappable=False): # Any apps in self.real_apps should have all their models included # in the render. We don't use the original model instances as there # are some variables that refer to the Apps object. # FKs/M2Ms from real apps are also not included as they just # mess things up with partial states (due to lack of dependencies) self.real_models = [] for app_label in real_apps: app = global_apps.get_app_config(app_label) for model in app.get_models(): self.real_models.append(ModelState.from_model(model, exclude_rels=True)) # Populate the app registry with a stub for each application. app_labels = {model_state.app_label for model_state in models.values()} app_configs = [AppConfigStub(label) for label in sorted(real_apps + list(app_labels))] super(StateApps, self).__init__(app_configs) self.render_multiple(list(models.values()) + self.real_models) # If there are some lookups left, see if we can first resolve them # ourselves - sometimes fields are added after class_prepared is sent for lookup_model, operations in self._pending_lookups.items(): try: model = self.get_model(lookup_model[0], lookup_model[1]) except LookupError: app_label = "%s.%s" % (lookup_model[0], lookup_model[1]) if app_label == settings.AUTH_USER_MODEL and ignore_swappable: continue # Raise an error with a best-effort helpful message # (only for the first issue). Error message should look like: # "ValueError: Lookup failed for model referenced by # field migrations.Book.author: migrations.Author" msg = "Lookup failed for model referenced by field {field}: {model[0]}.{model[1]}" raise ValueError(msg.format(field=operations[0][1], model=lookup_model)) else: do_pending_lookups(model)
