feat(workflow): support multi-variable assignment in assigner node

api/app/core/workflow/nodes/assigner/config.py

@@ -1,21 +1,32 @@
-from pydantic import Field
+from pydantic import Field, BaseModel
 
 from app.core.workflow.nodes.base_config import BaseNodeConfig
 from app.core.workflow.nodes.enums import AssignmentOperator
 
 
-class AssignerNodeConfig(BaseNodeConfig):
+class AssignmentItem(BaseModel):
+    """
+    Single assignment definition.
+    """
+
     variable_selector: str | list[str] = Field(
         ...,
-        description="Variables to be assigned",
+        description="Target variable name(s) to assign",
     )
 
     operation: AssignmentOperator = Field(
         ...,
-        description="Operator to assign",
+        description="Assignment operator",
     )
 
     value: str | list[str] = Field(
         ...,
-        description="Values to assign",
+        description="Value(s) to assign to the variable(s)",
+    )
+
+
+class AssignerNodeConfig(BaseNodeConfig):
+    assignments: list[AssignmentItem] = Field(
+        ...,
+        description="List of variable assignment definitions",
     )

api/app/core/workflow/nodes/assigner/node.py

@@ -29,9 +29,9 @@ class AssignerNode(BaseNode):
         """
         # Initialize a variable pool for accessing conversation, node, and system variables
         pool = VariablePool(state)
-
+        for assignment in self.typed_config.assignments:
             # Get the target variable selector (e.g., "conv.test")
-        variable_selector = self.typed_config.variable_selector
+            variable_selector = assignment.variable_selector
             if isinstance(variable_selector, str):
                 # Support dot-separated string paths, e.g., "conv.test" -> ["conv", "test"]
                 variable_selector = variable_selector.split('.')
@@ -41,7 +41,7 @@ class AssignerNode(BaseNode):
                 raise ValueError("Only conversation variables can be assigned.")
 
             # Get the value or expression to assign
-        value = self.typed_config.value
+            value = assignment.value
             if isinstance(value, list):
                 value = '.'.join(value)
             value = ExpressionEvaluator.evaluate(
@@ -57,7 +57,7 @@ class AssignerNode(BaseNode):
             )
 
             # Execute the configured assignment operation
-        match self.typed_config.operation:
+            match assignment.operation:
                 case AssignmentOperator.ASSIGN:
                     operator.assign()
                 case AssignmentOperator.CLEAR:
@@ -77,4 +77,4 @@ class AssignerNode(BaseNode):
                 case AssignmentOperator.REMOVE_LAST:
                     operator.remove_last()
                 case _:
-                raise ValueError(f"Invalid Operator: {self.typed_config.operation}")
+                    raise ValueError(f"Invalid Operator: {assignment.operation}")