Question on a resembling function on truncatewords

[Kimitaka]

Hi, I started learning Django(also new to Python) and I would like to use it in Japanese. 

Since truncatewords doesn't seem working in non-English language, I tried to create a resembling function. 

I wrote the function in my Product class in my models.py:

class Product(models.Model):

title = models.CharField(max_length=220)

description = models.CharField(max_length=3000, null=True, blank=True)

price = models.DecimalField(max_digits=1000, decimal_places=2, null=True, blank=True)

slug = models.SlugField()

timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)

updated = models.DateTimeField(auto_now_add=True, auto_now=False)

active = models.BooleanField(default=True)

def __unicode__(self):

return self.title

class Meta:

ordering = ['title',]

def shorten_words(self):

if len(self.description) > 20:

print self.desciption[0:20]

else:

print self.desciption

and I added a code in my products.html page:

{{ product.description.shorten_words() }}

And it's not working.. 

Could you give me some advices?

Thank you!

[C. Kirby]

Don't use the parenthasesbin the template. Just call {{product.description.shorten_words}}

Kirby

[Camilo Torres]

On Saturday, April 12, 2014 1:10:34 AM UTC-4:30, Kimitaka wrote:

I wrote the function in my Product class in my models.py:

class Product(models.Model):

title = models.CharField(max_length=220)

description = models.CharField(max_length=3000, null=True, blank=True)

price = models.DecimalField(max_digits=1000, decimal_places=2, null=True, blank=True)

slug = models.SlugField()

timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)

updated = models.DateTimeField(auto_now_add=True, auto_now=False)

active = models.BooleanField(default=True)

def __unicode__(self):

return self.title

class Meta:

ordering = ['title',]

def shorten_words(self):

if len(self.description) > 20:

print self.desciption[0:20]

else:

print self.desciption

and I added a code in my products.html page:

{{ product.description.shorten_words() }}

Hello,

Should it be?:

{{ product.shorten_words }} 

Regards,

Camilo

[Sanjay Bhangar]

This. And in the desciption() method, you want to do "return
self.description[0:20] and not print..." - print will just print the
output in the console at that point - you need to "return" the value
from the method.

So:

def shorten_words(self):
if len(self.description) > 20:

return self.desciption[0:20]
else:
return self.desciption

That, and {{ product.shorten_words }} in your template should do the trick.

All the best,
Sanjay

[Alvin Lindstam]

And also:

1)
You have misspelled description in the shorten_words method. In you model field definition, and in your length check it's "description" but in the print/return statements it's spelled "desciption".

2)
The python slicing operator is clever enough to handle indexes that are out of bounds without errors, so self.description[0:20] would do nothing if len(self.description)<=20. Your method could simply be written as 
def shorten_words(self):
    return self.description[0:20]

3)
You seem to be truncating by character count instead of word count, have you tried using the built in template tag truncatechars?
https://docs.djangoproject.com/en/dev/ref/templates/builtins/#truncatechars