Manytomany field returns empty list

I'm new to django so may not know smth but i've searched through google and haven't got any answer. I have such models:

class Word(models.Model):
    word = models.CharField(max_length=100)
    img = models.ImageField(upload_to='img/', blank=True, null=True)
    audio = models.FileField(upload_to='audio/', blank=True, null=True)
    language = models.ForeignKey(Language)
    def __unicode__(self):
        return self.word

class Lesson(models.Model):
    title = models.CharField(max_length=100)
    language = models.ForeignKey(Language)
    lesson_words_list = models.ManyToManyField(Word)
    def __unicode__(self):
        return self.title

And i have next function in views:

def view_lesson(request, language, lesson_title):
    cur_lesson = Lesson.objects.filter(title__iexact = lesson_title).get(language__name__iexact=language)
    words_list = cur_lesson.lesson_words_list.all()
    return render_to_response("view_lesson.html", {"language":language, "lesson_title": lesson_title, "words_list":words_list})

here is how i call it in the template:

{% for Word in words_list %}        
{{ Word.word }}
{% endfor %}

The problem is words_list 开发者_Go百科is empty while through the admin i clearly see that my lesson has related words. Why could it be empty? and where should i search for an answer?

Is

{{ cur_lesson }} 

showing the correct lesson in your template?

Try:

{% for word in cur_lesson.lesson_word_list.all %}
    {{ word }}
{% endfor %}

Also see if

{{ cur_lesson.lesson_word_list.all }}

show the correct list of words in your template