feat(api/workflow): Add Conversation.dialogue_count (#7275)

api/core/workflow/nodes/tool/tool_node.py

@@ -2,19 +2,20 @@ from collections.abc import Mapping, Sequence
 from os import path
 from typing import Any, cast
 
-from core.app.segments import parser
+from core.app.segments import ArrayAnyVariable, parser
 from core.callback_handler.workflow_tool_callback_handler import DifyWorkflowCallbackHandler
 from core.file.file_obj import FileTransferMethod, FileType, FileVar
 from core.tools.entities.tool_entities import ToolInvokeMessage, ToolParameter
 from core.tools.tool_engine import ToolEngine
 from core.tools.tool_manager import ToolManager
 from core.tools.utils.message_transformer import ToolFileMessageTransformer
-from core.workflow.entities.node_entities import NodeRunMetadataKey, NodeRunResult, NodeType, SystemVariable
+from core.workflow.entities.node_entities import NodeRunMetadataKey, NodeRunResult, NodeType
 from core.workflow.entities.variable_pool import VariablePool
+from core.workflow.enums import SystemVariable
 from core.workflow.nodes.base_node import BaseNode
 from core.workflow.nodes.tool.entities import ToolNodeData
 from core.workflow.utils.variable_template_parser import VariableTemplateParser
-from models.workflow import WorkflowNodeExecutionStatus
+from models import WorkflowNodeExecutionStatus
 
 
 class ToolNode(BaseNode):
@@ -140,9 +141,9 @@ class ToolNode(BaseNode):
         return result
 
     def _fetch_files(self, variable_pool: VariablePool) -> list[FileVar]:
-        # FIXME: ensure this is a ArrayVariable contains FileVariable.
         variable = variable_pool.get(['sys', SystemVariable.FILES.value])
-        return [file_var.value for file_var in variable.value] if variable else []
+        assert isinstance(variable, ArrayAnyVariable)
+        return list(variable.value) if variable else []
 
     def _convert_tool_messages(self, messages: list[ToolInvokeMessage]):
         """