python - 如何在 Django 中创建具有相同模型的多对多关系并保存到数据库?
问题描述
我有一个表单,它正在收集有关要创建的变量的数据。我想创建一个数据库中已经存在的变量列表。我通过创建多对多关系来做到这一点。当我启动服务器时,变量列表保存在应用程序中,但它不会更改名为选择性列表的数据库字段。
表格.py
class VariableForm(ModelForm):
class Meta:
model = variable
fields = ['name', 'area', 'parameterName', 'order', 'type', 'format', 'units', 'comboItems',
'hiAlarm', 'loAlarm', 'scaleHiMax', 'scaleLoMax', 'deviationAlarm','selectiveList', 'round',
'days', 'required', 'hidden', 'readOnly', 'holdLast', 'calibrationFrequency',
'dateNextCalibration', 'triggerCalibrated']
widgets = {
'comboItems': forms.Textarea(attrs={'rows':1, 'cols': 40, 'style': 'height: 2em;padding-top:0'}),
'forceValue': forms.Textarea(attrs={'rows':1, 'cols': 40, 'style': 'height: 2em;padding-top:0',
'placeholder':'This will force all input to this variable'})
}
#selectiveList = forms.ModelMultipleChoiceField(queryset=variable.objects.all().order_by('-name').reverse())
def __init__(self, *args, **kwargs):
self.request = kwargs.pop('request', None)
super(VariableForm, self).__init__(*args, **kwargs)
self.fields['round'] = forms.ModelMultipleChoiceField(
queryset=opRound.objects.all(),
widget=forms.SelectMultiple,
label='Rounds',
required=False
)
self.fields['selectiveList'] = forms.ModelMultipleChoiceField(
queryset=variable.objects.all().order_by('-name').reverse(),
widget=forms.SelectMultiple,
label='Select Variables',
required=False
)
self.fields['days'] = forms.ModelMultipleChoiceField(
queryset=dayOfWeek.objects.all(),
widget=forms.SelectMultiple,
label='Days',
required=False
)
self.fields['area'].choices = AreaIterator(request = self.request)
try:
self.fields['order'].initial = variable.objects.latest().order+1
except Exception,e:
print e
模型.py
class variable(models.Model):
name = models.CharField(max_length=255)
area = models.ForeignKey(area)#parent
order = models.IntegerField("Order Index (0 is first, 1 is next, etc.)",default=999)#order index to display in order correctly, ascending
type = models.CharField(max_length=255, choices=(("Value", "Value"), ("Runtime", "Runtime/FlowTotal"),
("Message", "Message"), ("CheckBox", "Check Box List"), ("Selection", "Selection Box"), ("Formula2", "Formula with other Variables"),
("OnOff", "In/Out of Service Selection"), ("OnOffSelection", "Selective On/Off")),
default = "Value" )#what type of variable
format = models.CharField(max_length=255,choices=(("Number", "Number (Without Decimals)"),
("2Number", "Number (With Decimals)"), ("Date", "Date"),
("Time", "Time"), ("Text", "Text")), blank=True, null=True, default="2Number" )#number format if needed
units = models.CharField(max_length=255,blank=True,null=True)#units of measurement
required = models.BooleanField(default=True)#is the variable required in a round
hiAlarm = models.FloatField("High Alarm",blank=True,null=True)#red notify if above
loAlarm = models.FloatField("Low Alarm",blank=True,null=True)#yellow notify if below
scaleHiMax = models.FloatField("Limit maximum value",blank=True,null=True)#scale to high max if needed
scaleLoMax = models.FloatField("Limit low value",blank=True,null=True)#scale to low if needed
deviationAlarm = models.FloatField("Deviation Alarm",blank=True,null=True,
help_text="Triggers an alarm if the value between this record and the last is greater than this percentage.")#%change check
round = models.ManyToManyField(opRound,blank=True)#round of gathering data
days = models.ManyToManyField(dayOfWeek,blank=True)#day of the week
selectiveList = models.ManyToManyField("self",through="variable",blank=True,symmetrical=False)#List to determine which variables to display when the selection is "OFF"
parameterName = models.CharField("Parameter Name (ReportID)",max_length=255,blank=True,null=True)#hachWIM ID
comboItems = models.TextField("List of comma separated options.", blank=True,null=True)#list deliminated by a column for choosing
#PUT EQUATION HERE
hidden = models.BooleanField("Sync to tablet",default=True)#this muse be True if required is true
readOnly = models.BooleanField("Read only.", default = False)
dateTimeEdited = models.DateTimeField(auto_now=True)#date edited
userEdited = models.ForeignKey(CustomUser,blank=True,null=True,related_name="userEditedV")# last user to edit data
forceValue = models.TextField(blank=True,null=True)#force reading
userForced = models.ForeignKey(CustomUser,blank=True,null=True,related_name="userForcedV")# last user to force data
useForce = models.BooleanField("Turn Forcing On", default=False)
dateNextCalibration = models.DateField("Next Calibration Date", blank=True,null=True, help_text="YYYY-MM-DD")
triggerCalibrated = models.BooleanField("Trigger next calibration date", default=False)
calibrationFrequency = models.ForeignKey(calibrationFrequency, blank=True, null=True)
version = models.BigIntegerField(default=1)#used for sync
holdLast = models.BooleanField("Selecting this will hold the last value on the tablet automatically.", default=False)
当我们尝试从不同的模型(例如圆形或天数)中执行此操作时,它会使用这些关系创建一个新的数据库表。我想将选定的值作为字符串列表存储在同一模型的选择性列表列中。
解决方案
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