Flask Framework Cookbook - Second Edition

How to do it...

Follow these steps in order to implement the lazy evaluation of translations:

1. To mark all the field labels in the product and category forms as translatable, make the following changes to my_app/catalog/models.py:

from flask_babel import _ 
 
class NameForm(FlaskForm): 
    name = StringField(_('Name'), validators=[InputRequired()]) 
 
class ProductForm(NameForm): 
    price = DecimalField(_('Price'), validators=[ 
        InputRequired(), NumberRange(min=Decimal('0.0')) 
    ]) 
    category = CategoryField( 
        _('Category'), validators=[InputRequired()], coerce=int 
    ) 
    image = FileField(_('Product Image')) 
 
class CategoryForm(NameForm): 
    name = StringField(_('Name'), validators=[ 
        InputRequired(), check_duplicate_category() 
    ]) 

Notice that all the field labels ...