用户添加的Django模型额外字段

如何解决用户添加的Django模型额外字段

该模型将要求输入人员姓名和资格，这都是文本字段，但人员数量因实例而异。我如何让用户向模型添加字段？

这是我目前的模特：

class ShiftReport(models.Model):
    work = models.ForeignKey(Work,null=True,on_delete=models.CASCADE)
    work_description = models.TextField(max_length=500)
    handover = models.BooleanField(default=False)
    weather_conditions = models.TextField(max_length=100)
    start_time = models.DateTimeField()
    end_time = models.DateTimeField()
    noms_number = models.TextField(max_length=40)
    noms_phase_addition_number = models.TextField(max_length=5)

    
    personnel_name = models.TextField(max_length=100)
    personnel_qualifications = models.TextField(max_length=100)

    personnel_name_2 = models.TextField(max_length=100)
    personnel_qualifications_2 = models.TextField(max_length=100)

我希望能够让用户添加他们想要的尽可能多的人员姓名和资格。

class ShiftReport(models.Model):
    work = models.ForeignKey(Work,on_delete=models.CASCADE)
    work_description = models.TextField(max_length=500)
    handover = models.BooleanField(default=False)
    weather_conditions = models.TextField(max_length=100)
    start_time = models.DateTimeField()
    end_time = models.DateTimeField()
    noms_number = models.TextField(max_length=40)
    noms_phase_addition_number = models.TextField(max_length=5)

    
    personnel_name = models.TextField(max_length=100)
    personnel_qualifications = models.TextField(max_length=100)
    
    personnel_count = 1

    def add_personnel(self):
        self.personnel_count += 1
        ADDFIELD(personnel_name_{self.personnel_count})
        ADDFIELD(personnel_qualifications_{self.personnel_count}

只是不太确定如何实现此目的。救命！

解决方法

不可能使用户动态地向模型添加字段。但是您可以做的是，制作一个容器模型和您要存储的内容模型方法。

例如，（摘录自我的代码）。我想存储用户可以发送给我们的第 n 个文档。而不是静态定义字段 10次。我宁愿创建一个可以包含一组文档的文档容器。

容器模型= SupportDocsContainer
ContentToStoreToContainer模型= SupportDocs

# ! ContentToStoreToContainer Model
class SupportDocs(models.Model):
    document = models.FileField(
        upload_to=<...>,null=False,blank=False,max_length=2048,verbose_name="Case-Supporting Documents / Report Proofs",help_text="Images or documents that can be submitted inside Review Support Case.",validators=[
            FileExtensionValidator(
                allowed_extensions=(["pdf","docx","doc","jpg","jpeg","png","gif"])
            )
        ],)

# ! Container Model
class SupportDocsContainer(models.Model):
    documents = models.ManyToManyField(
        "SupportDocs",editable=True,verbose_name="List of Documents Provided by the Message Sender / Request Initiator",help_text="A many-to-many field that involves documents.",)
    dtLastModified = models.DateTimeField(
        auto_now=True,editable=False,verbose_name="Date and Time Document Container was Modified",help_text="The date and time from where the document container has been modified.",)
    dtCreated = models.DateTimeField(
        auto_now_add=True,verbose_name="Date and Time Document Container was Created.",help_text="The date and time from where the document container has been created.",)

使用这种方法，您可以使ShiftReport对象创建一个对象（ 通过信号，清除或保存方法自动进行。（但可以自行实现...） ），用户可以从中保存特定数据。

,

一种方法是，将人员姓名和资格字段设置为ShiftReport的ForeignKey实例，然后使用javascript进行动态添加。

，因为您尚未共享任何其他数据。因此，为了给您一个想法，假设模型如下：

class ShiftReport(models.Model):
    work_description = models.TextField(max_length=500)

class PersonalInfo(models.Model):
    shift_report = models.ForeignKey(ShiftReport,on_delete=models.CASCADE)
    personnel_name = models.TextField(max_length=100)
    personnel_qualifications = models.TextField(max_length=100)

那么视图将是：

def shift_report_view(request):
    if request.method == "POST":
        work_description = request.POST.get("work_description")
        personnel_name_list = request.POST.getlist("personnel_name")
        personnel_qualifications_list = request.POST.getlist("personnel_qualifications")

        personnel_info = zip(personnel_name_list,personnel_qualifications_list)

        shift_report_data = ShiftReport(work_description=work_description)
        shift_report_data.save()

        for i in personnel_info:
            if not len(i[0]) == len(i[1]) == 0:
                personal_info_data = PersonalInfo(shift_report=shift_report_data,personnel_name=i[0],personnel_qualifications=i[1])
                personal_info_data.save()
        
    return render(request,"shift_report.html")

和在模板中：

<form method="POST" action="">
    {% csrf_token %}
    <input type="text" name="work_description" placeholder="Work Description"><br><br>

    <div id="personalInfo">
        <input type="text" name="personnel_name" placeholder="Personnel Name"><br><br>
        <input type="text" name="personnel_qualifications" placeholder="Personnel Qualifications"><br><br>
    </div>

    <input type="button" id="addPersonalInfo" value="Add Personal Info">
    <input type="submit" value="submit">
</form>


<script type="text/javascript">
    document.getElementById("addPersonalInfo").onclick = function() {
        
        var personnelName = document.createElement("input");
        personnelName.type = "text";
        personnelName.name = "personnel_name";
        personnelName.placeholder = "Personnel Name";

        var personnelQualifications = document.createElement("input");
        personnelQualifications.type = "text";
        personnelQualifications.name = "personnel_qualifications";
        personnelQualifications.placeholder = "Personnel Qualifications";

        var personnelDiv = document.getElementById("personalInfo");
        personnelDiv.appendChild(personnelName);
        personnelDiv.appendChild(document.createElement("br"));
        personnelDiv.appendChild(document.createElement("br"));
        personnelDiv.appendChild(personnelQualifications);
        personnelDiv.appendChild(document.createElement("br"));
        personnelDiv.appendChild(document.createElement("br"));

    }
</script>