Added page clearing function

models.py

@@ -9,6 +9,7 @@ from pdfformfiller.controller import PopplerController
 FIELD_TYPE_CHOICES = (
     ('t', 'Text'),
     ('c', 'Checkbox'),
+    ('b', 'Button'),
     )
 
 
@@ -52,9 +53,14 @@ class Page(models.Model):
     def __unicode__(self):
         return self.name
 
-    def process_fields(self):
-        poppler_con = PopplerController(self.document.pdf.path)
-        fields = poppler_con.get_page_fields(self.page_num)
+    @property
+    def poppler(self):
+        if not hasattr(self, '_poppler'):
+            self._poppler = PopplerController(self.document.pdf.path)
+        return self._poppler
+
+    def extract_fields(self):
+        fields = self.poppler.get_page_fields(self.page_num)
 
         for fdata in fields:
             try:
@@ -63,12 +69,12 @@ class Page(models.Model):
                 field = FormField(page=self,
                                   name=fdata['name'])
 
+            field.fieldtype = fdata['type']
             area = fdata['area']
             field.pos_x = area['pos_x']
             field.pos_y = area['pos_y']
             field.width = area['width']
             field.height = area['height']
-            field.fieldtype = 't'
             field.save()
 
 
@@ -76,7 +82,7 @@ class Page(models.Model):
 def page_post_save(sender, **kwargs):
     instance = kwargs.get('instance', None)
     if instance:
-        instance.process_fields()
+        instance.extract_fields()
 
 models.signals.post_save.connect(page_post_save, sender=Page)
 
@@ -95,3 +101,8 @@ class FormField(models.Model):
 
     def page_num(self):
         return self.page.page_num
+
+    @classmethod
+    def create_from_poppler_field(cls, field):
+        return cls()
+