Forms in Python

In [1]:

    

from pprint import pprint
from organizer.forms import TagForm


    

In [2]:

    

tform = TagForm()


    

In [3]:

    

tform.is_bound  # no data


    

    
Out[3]:





False

In [4]:

    

tform.is_valid()  # data is not valid


    

    
Out[4]:





False

In [5]:

    

tform = TagForm({})


    

In [6]:

    

tform.is_bound


    

    
Out[6]:





True

In [7]:

    

try:
    tform.cleaned_data
except AttributeError as e:
    print(e)


    

    




'TagForm' object has no attribute 'cleaned_data'

In [8]:

    

tform.is_valid()


    

    
Out[8]:





False

In [9]:

    

tform.cleaned_data  # created by is_valid()


    

    
Out[9]:





{}

In [10]:

    

tagdata = {
    'name':'new tag',
    'slug':'new_tag',
}
tform = TagForm(tagdata)


    

In [11]:

    

tform.is_bound


    

    
Out[11]:





True

In [12]:

    

tform.is_valid()


    

    
Out[12]:





True

In [13]:

    

tform.cleaned_data


    

    
Out[13]:





{'name': 'new tag', 'slug': 'new_tag'}

In [14]:

    

# from the TagForm above
tform.errors


    

    
Out[14]:





{}

In [15]:

    

tform = TagForm(tagdata)
tform.errors


    

    
Out[15]:





{}

In [16]:

    

tform.cleaned_data  # created by access to errors attribute


    

    
Out[16]:





{'name': 'new tag', 'slug': 'new_tag'}

In [17]:

    

errordata = {
    'name':None,
    'slug':'new_tag',
}
tform = TagForm(errordata)


    

In [18]:

    

tform.is_bound


    

    
Out[18]:





True

In [19]:

    

tform.is_valid()


    

    
Out[19]:





False

In [20]:

    

tform.cleaned_data


    

    
Out[20]:





{'slug': 'new_tag'}

In [21]:

    

tform.errors


    

    
Out[21]:





{'name': ['This field is required.']}

In [22]:

    

# normally lazily evaluates
# pprint helps make this much clearer
# (try it without pprint yourself!)
pprint(tform.errors.as_data())


    

    




{'name': [ValidationError(['This field is required.'])]}

In [23]:

    

errordata2 = {
    'name':'abcdefghijklmnopqrstuvwxyzabcdef',
    'slug':'new_tag',
}


    

In [24]:

    

len(errordata2['name'])


    

    
Out[24]:





32

In [25]:

    

tform = TagForm(errordata2)
tform.is_valid()


    

    
Out[25]:





False

In [26]:

    

tform.cleaned_data


    

    
Out[26]:





{'slug': 'new_tag'}

In [27]:

    

tform.errors


    

    
Out[27]:





{'name': ['Ensure this value has at most 31 characters (it has 32).']}