Refactor is_precompiled_letter to model

app/models.py

@@ -6,6 +6,7 @@ from flask import url_for, current_app
 
 from sqlalchemy.ext.declarative import declared_attr
 from sqlalchemy.ext.associationproxy import association_proxy
+from sqlalchemy.ext.hybrid import hybrid_property
 from sqlalchemy.dialects.postgresql import (
     UUID,
     JSON
@@ -641,6 +642,9 @@ class TemplateProcessTypes(db.Model):
     name = db.Column(db.String(255), primary_key=True)
 
 
+PRECOMPILED_TEMPLATE_NAME = 'Pre-compiled PDF'
+
+
 class TemplateBase(db.Model):
     __abstract__ = True
 
@@ -718,6 +722,14 @@ class TemplateBase(db.Model):
         else:
             return None
 
+    @hybrid_property
+    def is_precompiled_letter(self):
+        return self.hidden and self.name == PRECOMPILED_TEMPLATE_NAME and self.template_type == LETTER_TYPE
+
+    @is_precompiled_letter.setter
+    def is_precompiled_letter(self, value):
+        pass
+
     def _as_utils_template(self):
         if self.template_type == EMAIL_TYPE:
             return PlainTextEmailTemplate(