Use TemplateField for the web link template

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -15,6 +15,7 @@
   smart link views.
 - TemplateField shows the available variable in the help text
   automatically.
+- Use TemplateField for the web link template.
 
 3.3.4 (2019-12-09)
 ==================

mayan/apps/web_links/forms.py

@@ -2,10 +2,21 @@ from __future__ import unicode_literals
 
 from django import forms
 
+from mayan.apps.documents.models import Document
+from mayan.apps.templating.fields import TemplateField
+
 from .models import WebLink
 
 
 class WebLinkForm(forms.ModelForm):
+    def __init__(self, *args, **kwargs):
+        super(WebLinkForm, self).__init__(*args, **kwargs)
+        self.fields['template'] = TemplateField(
+            initial_help_text=self.fields['template'].help_text,
+            label=self.fields['template'].label, model=Document,
+            model_variable='document', required=True
+        )
+
     class Meta:
         fields = ('label', 'template', 'enabled')
         model = WebLink

mayan/apps/web_links/models.py

@@ -26,7 +26,7 @@ class WebLink(models.Model):
     template = models.TextField(
         help_text=_(
             'Template that will be used to craft the final URL of the '
-            'web link. The {{ document }} variable is available to the template.'
+            'web link.'
         ), verbose_name=_('Template')
     )
     enabled = models.BooleanField(default=True, verbose_name=_('Enabled'))