Django annotate报错遇到的问题

使用annotate过程中遇到的报错：

Sum requires values for lower and upper bounds

views里想要实现groupby效果，结果报了这个错误。后来发现是vscode自动导入了from sympy import Sum实际应该是from django.db.models import Avg, Max, Min,Sum

dc={"region_id":1}table = models.Ytdor.objects.filter(**dc)table_s = table.values('branch_id').annotate(s_ormv=Sum("ormv")).values("branch_id","s_ormv")

Cannot resolve keyword ‘branch’ into field. Choices are:

报错的是以下代码：

table_s = table.values('branch').annotate(s_ormv=Sum("ormv")).values("branch","s_ormv")

因为这个表是主表，只有branch_id，外键链接到子表：
主表：
字段id：xx，branch_id:xx

子表-表名branch:
字段：id:xxx,branch:xxx

用主表字段没问题，以下代码不会报错，但是只有id，不显示外键子表的对应字段名称

table_s = table.values('branch_id').annotate(s_ormv=Sum("ormv")).values("branch_id","s_ormv")

解决办法：

遍历的方式，用外键的表filter到这个id，再返回名字

from django.http import HttpResponse
from django.shortcuts import render
from matplotlib.font_manager import json_dump# Create your views here.
import json#from sympy import Sum
from django.db.models import Avg, Max, Min,Sumfrom app1 import forms,modelsfrom django.views.decorators.csrf import csrf_exempt@csrf_exempt
def index(request):br_id = request.GET.get('branch_id')rg_id = request.GET.get('region_id')ls_id = request.GET.get('lislio_id')km_id = request.GET.get('kam_id')if rg_id:if br_id:typ = "one_branch"else:typ = "one_region"else:if br_id:typ = "one_branch"else:typ = "no_select"print(br_id)print(rg_id)print(ls_id)print(km_id)test_ajax = {"a":1,"b":"2"}form = forms.fm1()table_all = models.Ytdor.objects.all()dc = {}if rg_id:dc['region_id'] = rg_idif br_id:dc['branch_id'] = br_idif ls_id:dc['lislio_id'] = ls_idif km_id:dc['kam_id'] = km_idform = forms.fm1(data = request.GET)table = models.Ytdor.objects.filter(**dc)      #筛选#分组聚合前一个values内写的是groupby的字段，annotate里的是聚合字段，sum，avg等，最后一个values里写的是需要呈现的字段#在筛选的结果下，对分公司id分组聚合，table_s = table.values('branch_id').annotate(s_ormv=Sum("ormv")).values("branch_id","region_id","s_ormv")#在筛选的结果下，对区域id分组聚合table_rg = table.values('region_id').annotate(s_ormv=Sum("ormv")).values("region_id","s_ormv")#遍历聚合后的querysetbr_list = []br_ormv_list = []    new_dc_br = {}for i in list(table_s):        #遍历queryset，每一行queryset，并取指定字段b_id = i['branch_id']      #获取branch_idr_id = i['region_id']      #获取region_ids_orm = i["s_ormv"]        #获取求和的字段br_name = models.Branch.objects.filter(id=b_id).first()     #用id来对外键子表进行筛选，注意要加firstrg_name = models.Region.objects.filter(id=r_id).first()     #类似的取region的名称br_list.append(str(br_name))   #要用str，不然append出来会有问题br_ormv_list.append(s_orm)new_dc_br["x_axis"] = br_list       ### 放入字典new_dc_br["y_axis"] = br_ormv_list  ### 放入字典new_dc_br["rg_id"] = r_id           ### 放入字典new_dc_rg = {}rg_list = []rg_ormv_list = []for i in list(table_rg):r_id = i['region_id']rg_name = models.Region.objects.filter(id=r_id).first()rg_ormv = i['s_ormv']rg_list.append(str(rg_name))rg_ormv_list.append(rg_ormv)new_dc_rg["x_axis"] = rg_listnew_dc_rg["y_axis"] = rg_ormv_listnew_dc_rg["br_id"] = r_idif request.method == "GET":return render(request,"index.html",{'table':table,'form':form,"region_id":rg_id,"branch_id":br_id,"lislio_id":ls_id,"kam_id":km_id,"typ":typ})else:if request.POST.get("front_to_end") == "br":return HttpResponse(json.dumps(new_dc_br))if request.POST.get("front_to_end") == "rg":return HttpResponse(json.dumps(new_dc_rg))              ##根据条件不同，返回不同的json.dumpselse:return render(request,"index.html",{'table':table,'form':form,"region_id":rg_id,"branch_id":br_id,"lislio_id":ls_id,"kam_id":km_id,"typ":typ})

后端往前端传数时：js中要加引号

    <script>var dt = '{{typ|safe}}'console.log(dt)</script>

echarts要定义div的长宽，不然不显示

<div class="container" id='main2' style="width: 600px;height:400px;">
</div>

<!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=1.0"><title>Document</title>{% load static %}<link rel="stylesheet" href="{% static 'plugins/bootstrap-3.4.1/css/bootstrap.css' %}">
</head><body><div class="container" id="main"><form method="GET">{% csrf_token %} {% for field in form%}<label for="exampleInputName2">{{field.label}}</label> {{field}} {% endfor%}<input type="submit" value="submit"><input type="text" name="123" id="ip1"><input type="button" value="submit" id="btn"></form></div><div class="container" id='main2' style="width: 600px;height:400px;"></div><script src="{% static 'plugins/echarts.min.js'%}"></script><script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script><script src="{% static 'plugins/bootstrap-3.4.1/js/bootstrap.js' %}"></script><script type="text/javascript">var chartDom = document.getElementById('main2');var myChart = echarts.init(chartDom);var option;</script><script>var dt = '{{typ|safe}}';console.log(dt);var xxx = "br";if (dt == "no_select") {xxx = "rg";};</script><script>$('#btn').click(function() {$.ajax({url: '',type: 'POST',data: {'front_to_end': xxx},success: function(an_input) {console.log(an_input);let obj = JSON.parse(an_input);$('#ip1').val(obj.x_axis);/*          ##############################################          */option = {xAxis: {type: 'category',data: obj.x_axis},yAxis: {type: 'value'},series: [{data: obj.y_axis,type: 'bar'}]};myChart.setOption(option);/*        ##########################################################     */}})})</script></body></html>

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