Configurable email subject

CHANGES.rst

@@ -4,7 +4,10 @@ Changelog
 2.7.1 (unreleased)
 ------------------
 
-- Configurable mail header and footer
+- Configurable email subject.
+  [folix-01]
+
+- Configurable mail header and footer.
   [folix-01]
 
 2.7.0 (2023-04-03)

README.rst

@@ -6,7 +6,7 @@
     :target: https://pypi.python.org/pypi/collective.volto.formsupport
     :alt: Egg Status
 
-.. image:: https://img.shields.io/pypi/pyversions/collective.volto.formsupport.svg?style=plastic   
+.. image:: https://img.shields.io/pypi/pyversions/collective.volto.formsupport.svg?style=plastic
     :target: https://pypi.python.org/pypi/collective.volto.formsupport/
     :alt: Supported - Python Versions
 
@@ -197,6 +197,11 @@ By default this is not set.
 
 The upload limit is also passed to the frontend in the form data with the `attachments_limit` key.
 
+Email subject templating
+========================
+You can also interpolate the form values to email subject using the field id, in this way: ${123321123}
+
+
 Content-transfer-encoding
 =========================
 

src/collective/volto/formsupport/restapi/services/submit_form/post.py

@@ -220,11 +220,25 @@ def get_bcc(self):
                 bcc.append(data["value"])
         return bcc
 
-    def send_data(self):
+    def get_subject(self):
         subject = self.form_data.get("subject", "") or self.block.get(
             "default_subject", ""
         )
 
+        for i in self.form_data.get("data", []):
+            field_id = i.get("field_id")
+
+            if not field_id:
+                continue
+
+            subject = subject.replace("${" + i.get("field_id") + "}", i.get("value"))
+
+        return subject
+
+    def send_data(self):
+
+        subject = self.get_subject()
+
         mfrom = self.form_data.get("from", "") or self.block.get("default_from", "")
         mreply_to = self.get_reply_to()