python - Haystack 使用反向关系索引对象

Question

我有两个模型:

class Question(models.Model):
    question_text = models.TextField()

class Response(models.Model):
    response_text = models.TextField()
    question = models.ForeignKey(Question, related_name='responses', on_delete=models.CASCADE)

我有一个干草堆搜索索引来索引所有问题的question_text:

class QuestionIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True)
    question_text = indexes.CharField(model_attr='question_text')
    def get_model(self):
        return Question

如何为所有 response_text 建立索引，以便在搜索 Question 时获得与 question_text 匹配的所有问题以及所有具有与 response_text 匹配的答案的问题？我想要这样的东西:

class QuestionIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True)
    question_text = indexes.CharField(model_attr='question_text')
    response_text = indexes.CharField(model_attr='responses__response_text')
    def get_model(self):
        return Question

终极问题:如何使用此 QuestionIndex 类对所有 response_text 建立索引？

Answer 1

您可以提供 prepare_ method让该字段指定索引哪些数据:

class QuestionIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True)
    question_text = indexes.CharField(model_attr='question_text')
    response_text = indexes.CharField()

    def prepare_response_text(self, obj):
        return ', '.join([r.response_text for r in obj.responses.all()])