Fix: Replaced .dict() by .model_dump() and .json() by `.model_d…

…ump_json()`

src/aleph/schemas/base_messages.py

@@ -55,6 +55,7 @@ def check_item_type(self):
                 raise ValueError(
                     f"Expected {expected_item_type} based on hash but item type is {item_type}."
                 )
+        return self
 
     @classmethod
     @field_validator("item_hash", mode="after")

src/aleph/schemas/pending_messages.py

@@ -45,8 +45,8 @@ class BasePendingMessage(AlephBaseMessage, Generic[MType, ContentType]):
     A raw Aleph message, as sent by users to the Aleph network.
     """
 
-    @model_validator(mode="before")
     @classmethod
+    @model_validator(mode="before")
     def load_content(cls, values):
         """
         Preload inline content. We let the CCN populate this field later

src/aleph/web/controllers/messages.py

@@ -128,6 +128,8 @@ def validate_field_dependencies(self):
         if start_block and end_block and (end_block < start_block):
             raise ValueError("end block cannot be lower than start block.")
 
+        return self
+
     @classmethod
     @field_validator(
         "hashes",

src/aleph/web/controllers/posts.py

@@ -96,6 +96,8 @@ def validate_field_dependencies(self):
         if start_date and end_date and (end_date < start_date):
             raise ValueError("end date cannot be lower than start date.")
 
+        return self
+
     @classmethod
     @field_validator(
         "addresses", "hashes", "refs", "post_types", "channels", "tags", mode="before"