Question

这是我的第一个django应用程序，我正在使用一个模型来更新表中的现有记录。我一直在做一些测试并且在添加新记录时没有任何问题，但是在编辑现有记录时，我的表单似乎表现得如预期（我没有错误），但更改不会被保存。我错过了什么？几天来我一直在努力，任何帮助都会受到最高的赞赏。

models.py：

class Mapindex(models.Model):
    COUNTY_CHOICES = (
        ('ALA', 'Alameda'),
        ('CC', 'Contra Costa'),
        ('MRN', 'Marin'),
        ('NAP', 'Napa'),
        ('SCL', 'Santa Clara'),
        ('SF', 'San Francisco'),
        ('SM', 'San Mateo'),
        ('SOL', 'Solano'),
        ('SON', 'Sonoma'),
    )

    ROUTE_CHOICES = (
        ('1', '1'),
        ('4', '4'),
        ('8', '8'),
        ('9', '9'),
        ('12', '12'),
        ('13', '13'),
        ('14', '14'),
        ('17', '17'),
        ('21', '21'),
        ('24', '24'),
        ('25', '25'),
        ('29', '29'),
        ('32', '32'),
        ('35', '35'),
        ('37', '37'),
        ('49', '49'),
        ('52', '52'),
        ('61', '61'),
        ('77', '77'),
        ('80', '80'),
        ('82', '82'),
        ('84', '84'),
        ('85', '85'),
        ('87', '87'),
        ('92', '92'),
        ('93', '93'),
        ('100', '100'),
        ('101', '101'),
        ('102', '102'),
        ('104', '104'),
        ('112', '112'),
        ('113', '113'),
        ('114', '114'),
        ('116', '116'),
        ('117', '117'),
        ('121', '121'),
        ('123', '123'),
        ('128', '128'),
        ('130', '130'),
        ('131', '131'),
        ('141', '141'),
        ('152', '152'),
        ('156', '156'),
        ('160', '160'),
        ('185', '185'),
        ('220', '220'),
        ('221', '221'),
        ('230', '230'),
        ('237', '237'),
        ('238', '238'),
        ('242', '242'),
        ('260', '260'),
        ('262', '262'),
        ('280', '280'),
        ('281', '281'),
        ('380', '380'),
        ('480', '480'),
        ('505', '505'),
        ('580', '580'),
        ('680', '680'),
        ('780', '780'),
        ('880', '880'),
        ('980', '980')

    )

    MAP_DATUMS_CHOICES = (
        ('CCS27Z2E', 'CCS27Z2E'),
        ('CCS27Z2M', 'CCS27Z2M'),
        ('CCS27Z3E', 'CCS27Z3E'),
        ('CCS27Z3M', 'CCS27Z3M'),
        ('CCS27Z4E', 'CCS27Z4E'),
        ('CCS83Z2E', 'CCS83Z2E'),
        ('CCS83Z2M', 'CCS83Z2M'),
        ('CCS83Z3E', 'CCS83Z3E'),
        ('CCS83Z3M', 'CCS83Z3M'),
        ('HARN83Z2E', 'HARN83Z2E'),
        ('HARN83Z2M', 'HARN83Z2M'),
        ('HARN83Z3E', 'HARN83Z3E'),
        ('HARN83Z3M', 'HARN83Z3M'),
        ('LOCAL_E', 'LOCAL_E'),
        ('LOCAL_M', 'LOCAL_M'),
    )

    objectid = models.IntegerField(unique=True, primary_key=True)
    sheetlabel = models.CharField(max_length=8000, blank=True, null=True)
    county = models.CharField(max_length=8000, choices=COUNTY_CHOICES)
    route = models.CharField(max_length=8000, choices=ROUTE_CHOICES)
    pmb = models.CharField(max_length=50, null=True)
    pme = models.CharField(max_length=50, null=True)
    map_sheet_desc = models.CharField(max_length=8000, blank=True, null=True)
    hangingfilegroup = models.CharField(max_length=8000, blank=True, null=True)
    maptype = models.CharField(max_length=8000, blank=True, null=True)
    index_map_filepath = models.CharField(max_length=8000, blank=True, null=True)
    grantor_box_filepath = models.CharField(max_length=8000, blank=True, null=True)
    status = models.CharField(max_length=8000, blank=True, null=True)
    publish = models.CharField(max_length=8000, blank=True, null=True)
    mapdatum = models.CharField(max_length=8000, choices=MAP_DATUMS_CHOICES)
    geo_referenced_datum = models.CharField(max_length=8000, blank=True, null=True)
    mapscale = models.CharField(max_length=8000, blank=True, null=True)
    mapyear = models.CharField(max_length=8000, blank=True, null=True)
    drawingdate = models.CharField(max_length=8000, blank=True, null=True)
    image_path_filename = models.CharField(max_length=8000, blank=True, null=True)
    control_map_filepath = models.CharField(max_length=8000, blank=True, null=True)
    info_sheet_filepath = models.CharField(max_length=8000, blank=True, null=True)
    image_web_path = models.CharField(max_length=300, blank=True, null=True)
    image_web_path_public = models.CharField(max_length=300, blank=True, null=True)
    grantor_box_web_path = models.CharField(max_length=300, blank=True, null=True)
    grantor_box_web_path_public = models.CharField(max_length=300, blank=True, null=True)
    longitude = models.DecimalField(max_digits=38, decimal_places=8, blank=True, null=True)
    latitude = models.DecimalField(max_digits=38, decimal_places=8, blank=True, null=True)
    survey_info_link = models.CharField(max_length=300, blank=True, null=True)
    survey_index_link = models.CharField(max_length=300, blank=True, null=True)
    control_pdf_link = models.CharField(max_length=300, blank=True, null=True)
    is_name = models.CharField(max_length=100, blank=True, null=True)
    is_name_control = models.CharField(max_length=100, blank=True, null=True)
    error_report_path = models.CharField(max_length=300, blank=True, null=True)
    imagefunctions = models.CharField(max_length=300, blank=True, null=True)
    controlimagefunctions = models.CharField(max_length=300, blank=True, null=True)
    centroid_postmile = models.CharField(max_length=50, blank=True, null=True)

    class Meta:
        # managed = False
        db_table = 'mapindex'

forms.py：

from django import forms
from .models import Mapindex

class MapIndexForm(forms.ModelForm):
    class Meta:
        model = Mapindex
        fields = ['objectid', 'image_path_filename', 'county', 'route', 'pmb', 'pme', 'map_sheet_desc', 'drawingdate',
                  'index_map_filepath', 'grantor_box_filepath', 'control_map_filepath', 'info_sheet_filepath', 'mapdatum']

        widgets = {'objectid': forms.HiddenInput()}

        labels = {
            'image_path_filename': 'PDF Filepath',
            'county': 'County',
            'route': 'Route',
            'pmb': 'Begin Postmile',
            'pme': 'End Postmile',
            'map_sheet_desc': 'Map Sheet Description',
            'drawingdate': 'Drawing Date',
            'index_map_filepath': 'Index Map Filepath',
            'grantor_box_filepath': 'Grantor Box Filepath',
            'control_map_filepath': 'Control Map Filepath',
            'info_sheet_filepath': 'Info Sheet Filepath',
            'mapdatum': 'Map Datum'
        }

views.py：

from django.http import request, HttpResponse
from django.shortcuts import render, get_object_or_404
from .models import Mapindex as MapIndexModel
from .forms import MapIndexForm
from django.contrib import messages


def mapindex_edit(request, row_id):
    record = get_object_or_404(MapIndexModel, pk=row_id)
    form_mapindex = MapIndexForm(request.POST or None, instance=record)
    return render(request, 'edit.html', {
                'title': 'Map Index Update Form',
                'form_mapindex': form_mapindex
            })

    if request.method == 'POST' and form_mapindex.isvalid():
        form_mapindex.save()
        return redirect(home)
    context = {'form_mapindex': record}
    return render(request, '/update/')

def saved(request):
    msg = 'Record saved!'
    return HttpResponse(msg)

urls.py：

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^$', views.saved, name='saved'),
    url(r'(?P<row_id>[0-9]+)/$', views.mapindex_edit , name='edit'),
]

和模板：

<!DOCTYPE html>             
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
  </head>
  <body>
    <table>
        <thead><th>{{title}}</th>   
    </table>
    <form method="POST" action="/update/">
        <fieldset>
            <legend>Create Map Index Record</legend>
            {% csrf_token %}
            <!-- {{form_mapindex}} -->
             {% for field in form_mapindex.hidden_fields %}
                {{ field }}
                <br>
            {% endfor %}

            {% for field in form_mapindex.visible_fields %}
                {{ field.label_tag }} 
                <br>
                {{ field }}
                <br>
            {% endfor %}

            <br><button type="submit" onclick="window.close()">Save Record</button>
        </fieldset>
        {% if form.errors %}
            {% for field in form %}
                {% for error in field.errors %}
                    <div class="alert alert-danger">
                        <strong>{{ error|escape }}</strong>
                    </div>
                {% endfor %}
            {% endfor %}
            {% for error in form.non_field_errors %}
                <div class="alert alert-danger">
                    <strong>{{ error|escape }}</strong>
                </div>
            {% endfor %}
        {% endif %}
    </form>
  </body>
</html>

Answer 1

因为您的视图在到达保存表单的代码之前返回。

与任何函数一样，一旦返回命中，就不再执行该函数中的代码。将该返回移动到函数的末尾。

Answer 2

def mapindex_edit(request, row_id):
  record = get_object_or_404(MapIndexModel, pk=row_id)
  form_mapindex = MapIndexForm(request.POST or None, instance=record)
  if request.POST:
    if form_mapindex.is_valid():
       form_mapindex.save()
       return redirect(home)

  return render(request, 'edit.html', {
              'title': 'Map Index Update Form',
              'form_mapindex': form_mapindex
          })

应该修复它。

如果表单无效，它将到达第二个return语句并再次显示表单以及错误（模板看起来很快就能显示出来）

使用django modelform编辑对象时，为什么没有将更改保存到数据库表？

2 个答案: