BootstrapRow for django-crispy-forms

gistfile1.py

class BootstrapRow(layout.Div): 
    """
    Puts form fields into bootstrap grid rows.
    
    Usage:
    ======
    Add fields by adding a tuple (field, columns) for each field (see example)
    
    Example:
    ========        
    helper.layout = Layout(BootstrapRow(('field1', 6), ('field2', 6)),
                           BootstrapRow(('field3', 4), ('field4', 4), ('field5', 4)),
                           ...
                          )
                          
    will result in the following markup:
    
    ...
    <div class="row">
      <div class="span6">
          <!-- markup for field1 goes here -->
      </div>
      <div class="span6">
          <!-- markup for field2 goes here -->
      </div>
    </div>
    <div class="row">
      <div class="span4">
          <!-- markup for field3 goes here -->
      </div>
      <div class="span4">
          <!-- markup for field4 goes here -->
      </div>
      <div class="span4">
          <!-- markup for field5 goes here -->
      </div>    
    </div>    
    """
    def __init__(self, *fields, **kwargs):
        _fields = []
        for field, cols in fields:
            span = 'span%i' % cols
            # expand the field itself to the given width by adding
            # the span class directly 
            if hasattr(field, 'render'):
                field.css_class = span
            else: 
                field = layout.Field(field, css_class=span)
            # wrap the field into a div with class="spanx"
            field = layout.Div(field, css_class=span)
            _fields.append(field)
        self.css_class='row'
        super(BootstrapRow, self).__init__(*_fields, **kwargs)