软件工程项目四则运算表达式生成----5

四则运算题目生成器

软件工程大作业的结对项目–四则运算题目生成器

写的是需求分析中的功能需求第四阶段的过程和内容

需求分析阶段的链接如下
软件工程项目四则运算表达式生成----1

网页之前的功能需求和设计的链接如下
软件工程项目四则运算表达式生成----3

网页的后端实现过程如下，贴上队友的链接
软件工程–四则运算表达式(4)

网页的前端实现过程的链接如下
软件工程项目四则运算表达式生成----4

做题和历史记录的设计过程

做题部分的功能是：
1.接受登录用户的做题请求
2.回传给用户一个表单用于填写做题信息
3.接收用户的表单，从数据库中取出相应的数据并且新建一个History记录保存用户的做题信息
4.给用户回传一个界面用于做题
5.接收用户做题信息并且对用户做题情况进行记录
6.返回用户答题成绩界面
7.可以让用户看到自己做错的题的信息

用例图

类图

顺序图

代码

控制器

from django.urls import path
from . import viewsapp_name = "Quest_Generator"
urlpatterns = [path('quest_generator/', views.generator, name="Generator"),path('answer/<int:num>/<int:answer_id>', views.confirm, name="Answer"),path('history/', views.youtube, name="History"),
]

用户在前端调用这些函数，跳转到对应页面

表单

from django import formsclass DSform(forms.Form):qunt = (('5', "给爷先来5个"),('10', "少废话再来5个"),('20', "20个让爷做到爽"),)quantity = forms.ChoiceField(label="想来几个题爽", choices=qunt)optr = (('2', "简单难度2"),('3', "简单难度3"),('4', "简单难度4"),('5', "中等难度5"),('6', "中等难度6"),('7', "中等难度7"),('8', "小学生都哭了的难度8"),('9', "小学生都哭了的难度9"),)operators = forms.MultipleChoiceField(label="爷来几个符号", choices=optr)if_pw = (('True', "要"),('False', "不要"),('Both', "爷都要"),)if_ng = (('True', "要"),('False', "不要"),('Both', "爷都要"),)if_fa = (('True', "要"),('False', "不要"),)potyp = (('True', "^"),('False', "**"),)if_pow = forms.ChoiceField(label="乘方", choices=if_pw)if_neg = forms.ChoiceField(label="负数", choices=if_ng)if_fra = forms.ChoiceField(label="分数", choices=if_fa)pow_type = forms.ChoiceField(label="类型", choices=potyp)class Form5(forms.Form):Kt1 = forms.CharField(max_length=128)Kt2 = forms.CharField(max_length=128)Kt3 = forms.CharField(max_length=128)Kt4 = forms.CharField(max_length=128)Kt5 = forms.CharField(max_length=128)class Form10(forms.Form):Kt1 = forms.CharField(max_length=128)Kt2 = forms.CharField(max_length=128)Kt3 = forms.CharField(max_length=128)Kt4 = forms.CharField(max_length=128)Kt5 = forms.CharField(max_length=128)Kt6 = forms.CharField(max_length=128)Kt7 = forms.CharField(max_length=128)Kt8 = forms.CharField(max_length=128)Kt9 = forms.CharField(max_length=128)Kt10 = forms.CharField(max_length=128)class Form20(forms.Form):Kt1 = forms.CharField(max_length=128)Kt2 = forms.CharField(max_length=128)Kt3 = forms.CharField(max_length=128)Kt4 = forms.CharField(max_length=128)Kt5 = forms.CharField(max_length=128)Kt6 = forms.CharField(max_length=128)Kt7 = forms.CharField(max_length=128)Kt8 = forms.CharField(max_length=128)Kt9 = forms.CharField(max_length=128)Kt10 = forms.CharField(max_length=128)Kt11 = forms.CharField(max_length=128)Kt12 = forms.CharField(max_length=128)Kt13 = forms.CharField(max_length=128)Kt14 = forms.CharField(max_length=128)Kt15 = forms.CharField(max_length=128)Kt16 = forms.CharField(max_length=128)Kt17 = forms.CharField(max_length=128)Kt18 = forms.CharField(max_length=128)Kt19 = forms.CharField(max_length=128)Kt20 = forms.CharField(max_length=128)

这个部分主要是用户选择题量和题目参数，提交给后端，查询数据库，返回题目给用户

视图

from django.shortcuts import render, HttpResponse
from login.models import User
from .forms import DSform, Form5, Form10, Form20
from SouSouSou.models import History
from SouSouSou.views import get_ls, string_change
import random
from .models import Answer, WrongAnswer# Create your views here.def generator(request):if not request.session.get('is_login', None):return HttpResponse('您尚未登陆,无法操作')if request.method == "POST":form = DSform(request.POST)if form.is_valid():quantity = form.cleaned_data['quantity']if_pow = form.cleaned_data['if_pow']if_fra = form.cleaned_data['if_fra']if_neg = form.cleaned_data['if_neg']potp = form.cleaned_data['pow_type']operator = form.cleaned_data['operators']quest = get_ls(operator=operator, if_pow=if_pow, if_neg=if_neg)user = User.objects.get(id=request.session.get('user_id', None))i = 0ot_ls = []history = History.objects.create()history.user = userhistory.quantity = quantityhistory.if_fra = if_frahistory.save()id = history.idwhile i < int(quantity):rand = random.randint(0, quest.__len__() - 1)quest[rand].question = string_change(quest[rand].question, potp)ot_ls.append(quest[rand])quest.pop(rand)i += 1i = 0while i < int(quantity):answer = Answer.objects.create()answer.answer_id = historyanswer.question = ot_ls[i]answer.save()i = i + 1if int(quantity) == 5:g_form = Form5elif int(quantity) == 10:g_form = Form10else:g_form = Form20context = {'output_list': ot_ls, 'form': g_form, 'answer_id': id, 'quantity': quantity}return render(request, 'question/Question_list.html', context)form = DSform()context = {'form': form}return render(request, 'question/Question.html', context)def confirm(request, num, answer_id):if request.method == "POST":if num == 5:form = Form5(request.POST)if form.is_valid():answer = {}answer[0] = form.cleaned_data['Kt1']answer[1] = form.cleaned_data['Kt2']answer[2] = form.cleaned_data['Kt3']answer[3] = form.cleaned_data['Kt4']answer[4] = form.cleaned_data['Kt5']history = History.objects.get(id=answer_id)if history.end_time != None:return HttpResponse('您已经提交过,请勿重复提交!')history.__set_end_time__()time = history.end_time - history.start_timeas_list = Answer.objects.filter(answer_id=history)i = 0s = numot_ls = []while i < answer.__len__():if history.if_fra == True:if not answer[i] == as_list[i].question.answer_Fraction:if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historyot_ls.append(as_list[i].question)wrong.save()s = s - 1else:if not float(answer[i]) == float(as_list[i].question.answer_float):if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historywrong.save()ot_ls.append(as_list[i].question)s = s - 1i = i + 1history.score = shistory.save()context = {'output_list': ot_ls, 'score': s, 'time': time, 'if_fra': history.if_fra}return render(request, 'question/your_score.html', context)return HttpResponse('请重新填写表单')elif num == 10:form = Form10(request.POST)print(request.POST)if form.is_valid():answer = {}answer[0] = form.cleaned_data['Kt1']answer[1] = form.cleaned_data['Kt2']answer[2] = form.cleaned_data['Kt3']answer[3] = form.cleaned_data['Kt4']answer[4] = form.cleaned_data['Kt5']answer[5] = form.cleaned_data['Kt6']answer[6] = form.cleaned_data['Kt7']answer[7] = form.cleaned_data['Kt8']answer[8] = form.cleaned_data['Kt9']answer[9] = form.cleaned_data['Kt10']history = History.objects.get(id=answer_id)if history.end_time != None:return HttpResponse('您已经提交过,请勿重复提交!')history.__set_end_time__()time = history.end_time - history.start_timeas_list = Answer.objects.filter(answer_id=history)i = 0s = numot_ls = []while i < answer.__len__():if history.if_fra == True:if not answer[i] == as_list[i].question.answer_Fraction:if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historyot_ls.append(as_list[i].question)wrong.save()s = s - 1else:if not float(answer[i]) == float(as_list[i].question.answer_float):if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historywrong.save()ot_ls.append(as_list[i].question)s = s - 1i = i + 1history.score = shistory.save()context = {'output_list': ot_ls, 'score': s, 'time': time, 'if_fra': history.if_fra}return render(request, 'question/your_score.html', context)return HttpResponse('请重新填写表单')if request.method == "POST":if num == 20:form = Form5(request.POST)print(request.POST)if form.is_valid():answer = {}answer[0] = form.cleaned_data['Kt1']answer[1] = form.cleaned_data['Kt2']answer[2] = form.cleaned_data['Kt3']answer[3] = form.cleaned_data['Kt4']answer[4] = form.cleaned_data['Kt5']answer[5] = form.cleaned_data['Kt6']answer[6] = form.cleaned_data['Kt7']answer[7] = form.cleaned_data['Kt8']answer[8] = form.cleaned_data['Kt9']answer[9] = form.cleaned_data['Kt10']answer[10] = form.cleaned_data['Kt11']answer[11] = form.cleaned_data['Kt12']answer[12] = form.cleaned_data['Kt13']answer[13] = form.cleaned_data['Kt14']answer[14] = form.cleaned_data['Kt15']answer[15] = form.cleaned_data['Kt16']answer[16] = form.cleaned_data['Kt17']answer[17] = form.cleaned_data['Kt18']answer[18] = form.cleaned_data['Kt19']answer[19] = form.cleaned_data['Kt20']history = History.objects.get(id=answer_id)if history.end_time != None:return HttpResponse('您已经提交过,请勿重复提交!')history.__set_end_time__()time = history.end_time - history.start_timeas_list = Answer.objects.filter(answer_id=history)i = 0s = numot_ls = []while i < answer.__len__():if history.if_fra == True:if not answer[i] == as_list[i].question.answer_Fraction:if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historyot_ls.append(as_list[i].question)wrong.save()s = s - 1else:if not float(answer[i]) == float(as_list[i].question.answer_float):if WrongAnswer.objects.filter(question=as_list[i].question):s = s - 1else:wrong = WrongAnswer.objects.create()wrong.question = as_list[i].questionwrong.answer_id = historywrong.save()ot_ls.append(as_list[i].question)s = s - 1i = i + 1history.score = shistory.save()context = {'output_list': ot_ls, 'score': s, 'time': time, 'if_fra': history.if_fra}return render(request, 'question/your_score.html', context)return HttpResponse('请重新填写表单')return HttpResponse('非法的提交操作')def youtube(request):if not request.session.get('is_login', None):return HttpResponse('您尚未登录,无法操作')user = User.objects.get(id=request.session.get('user_id', None))history = History.objects.filter(user=user)i = 0ot_ls = []while i < history.__len__():wa = WrongAnswer.objects.filter(answer_id=history[i])k = 0while k < wa.__len__():ot_ls.append(wa[k].question)k = k + 1i = i + 1return render(request, 'question/history.html', context={'output_list': ot_ls})

分为用户选择题目属性的部分和答题部分。

generator：向服务器发送get请求。如果用户没有登录，提示用户还没有登录。如果request的方法是POST，用户提交表单，跳转到题目页面。用user记录当前的user_id，并创建history对象，记录这次的答题情况，其user属性为上面提到的user。
这里是复用的sousousou的get_ls来获得出题的列表quest
从quest中随机选取quantity个数据插入ot_ls中返回给用户
为了防止二次抽取，每次抽取后从quest弹出这道题
为每个题创造一个answer对象，记录用户的答案

confirm：用户发送POST请求，提供给用户5道题的表单，用history的answer_id属性判断用户是不是重复提交，以及记录答题时间
答案分为分数形式和小数形式，如果答案错误，在WrongAnswer的model中找这道题，如果没有找到，创建WrongAnswer对象，其question属性是当前的错题，并加入ot_ls错题列表中，然后扣分。跳转到分数页面，显示分数，错题和用时。

youtube用于显示用户的做题历史记录，首先判断用户是否存在，存在的话从数据库中取出用户的信息，并且在history中查询相应的主键，然后再去WrongAnswer表中查询对应的错题记录，将相应的内容保存在output_list中，从相应的界面上返回给用户