Use TemplateField for smart links

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

HISTORY.rst

@@ -16,6 +16,7 @@
 - TemplateField shows the available variable in the help text
   automatically.
 - Use TemplateField for the web link template.
+- Use TemplateField for smart links.
 
 3.3.4 (2019-12-09)
 ==================

mayan/apps/linking/forms.py

@@ -6,6 +6,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.common.classes import ModelField, ModelProperty
 from mayan.apps.documents.models import Document
+from mayan.apps.templating.fields import TemplateField
 
 from .models import SmartLink, SmartLinkCondition
 
@@ -13,13 +14,10 @@ from .models import SmartLink, SmartLinkCondition
 class SmartLinkForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         super(SmartLinkForm, self).__init__(*args, **kwargs)
-        self.fields['dynamic_label'].help_text = ' '.join(
-            [
-                force_text(self.fields['dynamic_label'].help_text),
-                ModelProperty.get_help_text_for(
-                    model=Document, show_name=True
-                ).replace('\n', '<br>')
-            ]
+        self.fields['dynamic_label'] = TemplateField(
+            initial_help_text=self.fields['dynamic_label'].help_text,
+            label=self.fields['dynamic_label'].label, model=Document,
+            model_variable='document', required=False
         )
 
     class Meta:
@@ -35,13 +33,10 @@ class SmartLinkConditionForm(forms.ModelForm):
                 model=Document,
             ), label=_('Foreign document field')
         )
-        self.fields['expression'].help_text = ' '.join(
-            [
-                force_text(self.fields['expression'].help_text),
-                ModelProperty.get_help_text_for(
-                    model=Document, show_name=True
-                ).replace('\n', '<br>')
-            ]
+        self.fields['expression'] = TemplateField(
+            initial_help_text=self.fields['expression'].help_text,
+            label=self.fields['expression'].label, model=Document,
+            model_variable='document', required=False
         )
 
     class Meta:

mayan/apps/linking/models.py

@@ -28,10 +28,8 @@ class SmartLink(models.Model):
     )
     dynamic_label = models.CharField(
         blank=True, max_length=96, help_text=_(
-            'Enter a template to render. '
-            'Use Django\'s default templating language '
-            '(https://docs.djangoproject.com/en/1.11/ref/templates/builtins/). '
-            'The {{ document }} context variable is available.'
+            'Use this field to show a unique label depending on the '
+            'document from which the smart link is being accessed.'
         ), verbose_name=_('Dynamic label')
     )
     enabled = models.BooleanField(default=True, verbose_name=_('Enabled'))
@@ -155,7 +153,7 @@ class SmartLink(models.Model):
 class ResolvedSmartLink(SmartLink):
     """
     Proxy model to represent an already resolved smart link. Used for easier
-    colums registration.
+    columns registration.
     """
     class Meta:
         proxy = True
@@ -186,10 +184,8 @@ class SmartLinkCondition(models.Model):
     operator = models.CharField(choices=OPERATOR_CHOICES, max_length=16)
     expression = models.TextField(
         help_text=_(
-            'Enter a template to render. '
-            'Use Django\'s default templating language '
-            '(https://docs.djangoproject.com/en/1.11/ref/templates/builtins/). '
-            'The {{ document }} context variable is available.'
+            'The expression using document properties to be evaluated '
+            'against the foreign document field.'
         ), verbose_name=_('Expression')
     )
     negated = models.BooleanField(