Django admin form, field instead of object in foreign key

Question

Im using a forigen key to reference another object from my parent object. However when i go to the drop down list created by django admin, i get the object name instead of the field value. how can i add the field value to the form instead?

admin.py

    from django.contrib import admin

from .models import Maintenance
from .models import MaintenanceType
from .models import ServiceType

# Register your models here.


class MaintenanceAdmin(admin.ModelAdmin):
    list_display = ('Title','Impact','Service','Description','StartTime','EndTime',)
    list_editable = ('Title','Impact','Service','Description','StartTime','EndTime',)


admin.site.register(Maintenance, MaintenanceAdmin)

class MaintenanceTypeAdmin(admin.ModelAdmin):
    list_display = ('Type',)
    list_editable = ('Type',)

admin.site.register(MaintenanceType, MaintenanceTypeAdmin)

class ServiceTypeAdmin(admin.ModelAdmin):
    list_display = ('Service','Service',)
    list_editable = ('Service','Service',)

admin.site.register(ServiceType, ServiceTypeAdmin)

models.py

from django.db import models

# Create your models here.

class MaintenanceType(models.Model):
    Type = models.CharField(max_length=200)

    class Meta:
                verbose_name = "Planned Maintenance Types"
                verbose_name_plural = "Planned Maintenance Types"

class ServiceType(models.Model):
    Service = models.CharField(max_length=200)

    class Meta:
                verbose_name = "Service Types"
                verbose_name_plural = "Service Types"                

class Maintenance(models.Model):
    Title = models.CharField(max_length=200)
    Impact = models.ForeignKey(MaintenanceType)
    Service = models.ForeignKey(ServiceType)
    Description = models.TextField()
    StartTime = models.DateTimeField()
    EndTime = models.DateTimeField()

    class Meta:
                verbose_name = "Planned IT Maintenance"
                verbose_name_plural = "Planned IT Maintenance"                

Answer 1

Implement __str__ in the MaintenanceType model, which should return a string in whatever formatting you wish to appear in the drop down (and anywhere else actually).

It appears that you simply need to return self.Type.