我是Django学习者。 1.我需要在单个页面中为模型创建多个表单。 2.所以我使用modelformset_factory创建了表单集。 3.我有2个模型。a）模型寄存器b）模型GSPRequest。 4.ModelGSPRequest有一个名为registered_model的字段，它是ModelRegister的外键。 5.但是在我输入了modelformset的所有字段并单击提交以保存后。我在使用外键字段时遇到以下错误。
请帮助进一步进行操作。
Exception Type: ValueError
Exception Value:
Cannot assign "'G6'": "ModelGSPRequest.registered_model" must be a "ModelRegister" instance.
Exception Location: C:\Python3.6.0\MyScripts\djangoprojects\gsptracker\venv\lib\site-packages\django\db\models\fields\related_descriptors.py in __set__, line 211
下面是我的代码：
class ModelRegister(models.Model):
"""
This class is used to register the model.
"""
FLOAT_CHOICES = [[float(x), float(x)] for x in range(1, 21)]
model_leader = models.CharField("Model leader", max_length=128)
model_name = models.CharField(max_length=128, verbose_name="ModelName")
model_no = models.CharField(max_length=128, verbose_name="ModelNo")
os_name = models.ForeignKey(OSName, on_delete=models.CASCADE, verbose_name="OSName",default=" ")
os_version = models.FloatField(choices=FLOAT_CHOICES)
chipset_type = models.ForeignKey(ChipsetType,on_delete=models.CASCADE, verbose_name="chipsetType")
chipset_name = models.ManyToManyField(Chipset)
class Meta:
verbose_name_plural = "ModelRegisteredList"
def __str__(self):
return self.model_name
class ModelGSPRequest(models.Model):
"""
This class is used to raise Model GSP request.
"""
FLOAT_CHOICES = [[float(x),float(x)] for x in range(1,21)]
registered_model = models.ForeignKey(ModelRegister,on_delete=models.CASCADE, verbose_name="ModelName")
model_nos_for_reg_model = models.ManyToManyField(ModelNumber,default="")
#registered_model_no = models.CharField(max_length=128, verbose_name="ModelNo",default=" ")
registered_os_name = models.ForeignKey(OSName, on_delete=models.CASCADE, verbose_name="OSName",default=" ")
registered_os_version = models.FloatField(choices=FLOAT_CHOICES)
registered_chipset_type = models.ForeignKey(ChipsetType, on_delete=models.CASCADE, verbose_name="chipsetType",default=" ")
registered_chipset_name = models.ManyToManyField(Chipset)
model_gsp_requester = models.CharField("Model GSP Requester", max_length=128,default=" ")
integrator = models.CharField("Integrator", max_length=100,default=" ")
region = models.ForeignKey(Region, on_delete=models.CASCADE, verbose_name="Region",default=" ")
rel_cycle = models.ForeignKey(ReleaseCycle, on_delete=models.CASCADE, verbose_name="Release Cycle",default=" ")
rel_start_date = models.DateField(default=" ")
rel_end_date = models.DateField(default=" ")
rel_type = models.ForeignKey(ReleaseType, on_delete=models.CASCADE, verbose_name="Release Type",default=" ")
bingroup = models.ForeignKey(BinaryGroup, on_delete=models.CASCADE, verbose_name="BinaryGroup", default=" ")
base_os_fingerprint = models.CharField(max_length=200, verbose_name="Base OS FingerPrint",blank=True,null=True)
mpss_build_id = models.CharField(max_length=200,default=" ")
tz_build_id = models.CharField(max_length=200,default=" ")
previous_approved_sas_board = models.CharField(max_length=128,default=" ")
previous_approved_manifest = models.CharField(max_length=128,default=" ")
select_model_suffix = models.ForeignKey(ModelSuffix, on_delete=models.CASCADE,default=" ")
cupss_group = models.CharField(max_length=128,verbose_name="CUPSS Group",default=" ")
cupss_name = models.CharField(max_length=128,verbose_name="CUPSS Name",default=" ")
previous_swv = models.CharField(max_length=128,default=" ")
current_swv = models.CharField(max_length=128,default=" ")
previous_swov = models.CharField(max_length=128,default=" ")
current_swov = models.CharField(max_length=128,default=" ")
previous_svn = models.CharField(max_length=128,default=" ")
current_svn = models.CharField(max_length=128,default=" ")
previous_rev = models.CharField(max_length=128,default=" ")
current_rev = models.CharField(max_length=128, default=" ")
fota_images_path = models.CharField(max_length=200,default=" ")
#requested_Time = models.DateTimeField(auto_now_add=True,default=" ")
class Meta:
verbose_name_plural = "ModelGSPRequests"
def __str__(self):
return self.model_gsp_requester + self.integrator + str(self.pk)
class ModelRegisterForm(ModelForm):
"""
This class is used to register the model information.
"""
class Meta:
model = ModelRegister
exclude = ['model_leader']
#fields = '__all__'
@property
def helper(self):
helper = FormHelper()
helper.form_tag = 'model_register_form'
helper.layout = Layout(
Fieldset(
'Registered Model Details',
#Row('model_leader' ),
Row('model_name','model_no'),
Row('os_name', 'os_version'),
Row('chipset_type','chipset_name')
)
)
return helper
class ModelRegisterForm(ModelForm):
"""
This class is used to register the model information.
"""
class Meta:
model = ModelRegister
exclude = ['model_leader']
#fields = '__all__'
@property
def helper(self):
helper = FormHelper()
helper.form_tag = 'model_register_form'
helper.layout = Layout(
Fieldset(
'Registered Model Details',
#Row('model_leader' ),
Row('model_name','model_no'),
Row('os_name', 'os_version'),
Row('chipset_type','chipset_name')
)
)
return helper
def unique_values():
return [("","---------------")]+list(ModelRegister.objects.values_list('model_name','model_name').order_by('model_name').distinct())
class ModelGSPRequestForm(ModelForm):
"""
This class is used to define the form fields to raise the model GSP request.
"""
registered_model = forms.ChoiceField(required=False,choices=unique_values)
class Meta:
model = ModelGSPRequest
exclude = ['model_gsp_requester']
#choices=[]
def __init__(self, *args, **kwargs):
super(ModelGSPRequestForm, self).__init__(*args, **kwargs)
#self.form_tag = False
self.helper = FormHelper()
self.helper.layout = Layout(
Fieldset("Add Model GSP Request",
Row('registered_model','model_nos_for_reg_model','registered_os_name','registered_os_version','registered_chipset_type',
'registered_chipset_name','integrator','region','rel_cycle','rel_start_date','rel_end_date',
'rel_type','bingroup','base_os_fingerprint','mpss_build_id','tz_build_id',
'previous_approved_sas_board','previous_approved_manifest','select_model_suffix',
'cupss_group','cupss_name','previous_swv','current_swv','previous_swov','current_swov',
'previous_svn','current_svn','previous_rev','current_rev','fota_images_path')
)
)
self.fields['model_nos_for_reg_model'].queryset = ModelNumber.objects.none()
ModelGSPRequestFormSet = modelformset_factory(ModelGSPRequest, form=ModelGSPRequestForm, extra=1, can_delete=True)
def create_model_gsp_request_form(request,id=None):
print("Inside create_model_gsp_request_form")
template_name = "ModelGSPRequest.html"
heading_message = "ModelGSPRequest"
if id:
action = 'edit'
model = get_object_or_404(ModelGSPRequest, pk=id)
else:
action = 'submit'
model = ModelGSPRequest()
message = ""
if request.method == 'GET':
print("Get request in create_model_gsp_request_form")
# we don't want to display the already saved model instances
#formset = ModelGSPRequestFormSet(queryset=ModelGSPRequest.objects.none(),instance=model)
formset = ModelGSPRequestFormSet()
registered_model_details = serializers.serialize("json", ModelRegister.objects.all())
print("registered_model_details:", registered_model_details)
elif request.method == 'POST':
print("post request in create_model_gsp_request_form")
formset = ModelGSPRequestFormSet(request.POST,request.FILES)
if formset.is_valid():
for form in formset:
# only save if name is present
#if form.cleaned_data.get('name'):
new_form = form.save(commit=False)
new_form.model_gsp_requester = request.user.username
new_form.save()
formset.save_m2m()
return redirect('ModelGSPRequestList')
return render(request, template_name, {
'formset': formset,
'heading': heading_message,
'registered_model_data': registered_model_details,
'action':action
})
<!DOCTYPE html>
{% extends "base.html" %}
{% load crispy_forms_tags %}
{% block static %}
{% endblock static %}
{% block content %}
<form action="" method="post">
{% csrf_token %}
<div class="container">
{{ formset.management_form }}
<table class="table">
{% for form in formset.forms %}
{% if forloop.first %}
<thead>
<tr>
{% for field in form.visible_fields %}
<th>{{ field.label|capfirst }}</th>
{% endfor %}
</tr>
</thead>
{% endif %}
<tr class="{% cycle row1 row2 %} formset_row">
{% for field in form.visible_fields %}
<td>
{# Include the hidden fields in the form #}
{% if forloop.first %}
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
{% endif %}
{{ field.errors.as_ul }}
{{ field }}
</td>
{% endfor %}
</tr>
{% endfor %}
</table>
<button type="submit" class="btn btn-primary">
{% if action == "submit" %}
<span class="fas fa-plus"></span>Submit
{% else %}
<span class="fas fa-edit"></span>Update
{% endif %}
</button>
</div>
</form>
{% endblock content %}
{% block scripts %}
<script type="text/javascript">
$('.formset_row').formset({
addText: 'add model gsp request',
deleteText: 'remove',
prefix: 'modelgsp_set'
});
</script>
{% endblock scripts %}
[![ModelFormset created view][1]][1]
请在表单集中找到所选值foreign key的屏幕截图。
点击提交时抛出“无法分配“'G6'””：
"ModelGSPRequest.registered_model" must be a "ModelRegister" instance."