text: Title: Error in GraphQL Mutation Expected value of type ID
  Body: Model
  ```python
  class Series(models.Model):
      title = models.CharField(max_length=255, unique=True, db_index=True)
      desc = RichTextUploadingField(verbose_name="Description", default= "Coming Soon...", max_length=10000)
      series_type = models.ForeignKey(SeriesType, on_delete=models.CASCADE)
      SERIES_STATUS = (
          (0, 'Not Yet Released'),
          (1, 'Done')
      )
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      status = models.PositiveSmallIntegerField(choices=SERIES_STATUS, default=0)
  ```
  
  
  Schema
  ```python
  class SeriesNode(DjangoObjectType):
  
      class Meta:
          model = models.Series
          filter_fields = ['title', 'alt']
          interfaces = (relay.Node, )
  
  class SeriesMutation(DjangoModelFormMutation):
      series = graphene.Field(SeriesNode)
  
      class Meta:
          form_class = forms.AdvancedAddSeries
  
  class Mutation(graphene.ObjectType):
      create_series = SeriesMutation.Field()
  ```
  Query Mutation
  ```gql
  mutation CreateSeries($input: SeriesMutationInput!){
    createSeries(input:$input){
      series{
        title
        desc
        seriesType{
          id
        }
        
      }
      errors{
        field
        messages
      }
    }
  }
  ```
  
  Query Variables
  ```json
  {
    "input": {
      "title": "Series1",
      "desc": "to be updated",
      "seriesType": {
        	"id": "U2VyaWVzVHlwZU5vZGU6Mg=="
      },
      "user": {
        "id": "VXNlck5vZGU6MQ=="
      },
      "status": "A_0"
    }
  }
  ```
  Image of Error
  ![Image of Error](https://i.imgur.com/X9e6jiq.png)
  
  Reply
  ```json
  {
    "data": {
      "createSeries": {
        "series": null,
        "errors": [
          {
            "field": "series_type",
            "messages": [
              "Select a valid choice. That choice is not one of the available choices."
            ]
          },
          {
            "field": "status",
            "messages": [
              "Select a valid choice. A_0 is not one of the available choices."
            ]
          },
          {
            "field": "user",
            "messages": [
              "Select a valid choice. That choice is not one of the available choices."
            ]
          }
        ]
      }
    }
  }
  ```