用户名搜索Django

Question

我想按username进行搜索，但我的代码设置方式只能在用户模型中按id进行搜索。如何按username进行搜索？它可能很难，但我没有看到它是如何完成的。

模型

class Incident(models.Model):
       incident_id = models.CharField(max_length=1000)
       user_id = models.ForeignKey(User)

形式

<form method='GET' action='/search_incidents/'>
        <div class="row">   
            <div class="form-group col-md-3">
                <label>Incident ID</label>
                <input type="text" name="incident_id" value="{{ incident_id_query }}" class="form-control"/>
            </div>          
            <div class="form-group col-md-3">   
                <label>User ID</label>
                <input type="text" name="user_id" value="{{ user_id_query }}" class="form-control"/>
            </div>  
      </div>
</form>

查看

@login_required
def search_incidents(request):

    if request.method == 'GET':

        incident_id_query = request.GET.get('incident_id')
        user_id_query = request.GET.get('user_id')

        try:
            incident_id = str(incident_id_query)
        except ValueError:
            incident_id = None
        try:
            user_id = str(user_id_query)
        except ValueError:
            user_id = None

        list = [incident_id,user_id]

        if all(x is None for x in list): #check if `list` contains only None
            incident_list = None #this in case the query comes back empty
        else: #perform query

            incident_list = Incident.objects.filter(incident_id=incident_id).filter(user_id=user_id) 

        return render(request, 'search_incidents.html', { 
            'incident_list' : incident_list
        })