refactor: Update field input classes and module structure

src/backend/base/langflow/inputs/__init__.py

@@ -0,0 +1,25 @@
+from .inputs import (
+    BoolInput,
+    DictInput,
+    DropdownInput,
+    FileInput,
+    FloatInput,
+    IntInput,
+    NestedDictInput,
+    PromptInput,
+    SecretStrInput,
+    StrInput,
+)
+
+__all__ = [
+    "SecretStrInput",
+    "StrInput",
+    "IntInput",
+    "FloatInput",
+    "BoolInput",
+    "NestedDictInput",
+    "DictInput",
+    "DropdownInput",
+    "FileInput",
+    "PromptInput",
+]

src/backend/base/langflow/inputs/inputs.py

@@ -2,7 +2,7 @@ from typing import Callable, Optional, Union
 
 from pydantic import Field
 
-from langflow.template.field.input_mixin import (
+from .input_mixin import (
     BaseInputMixin,
     DatabaseLoadMixin,
     DropDownMixin,
@@ -10,50 +10,51 @@ from langflow.template.field.input_mixin import (
     FileMixin,
     ListableInputMixin,
     RangeMixin,
+    SerializableFieldTypes,
 )
 
 
 class PromptInput(BaseInputMixin, ListableInputMixin):
-    field_type = FieldTypes.PROMPT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.PROMPT
 
 
 # Applying mixins to a specific input type
 class StrInput(BaseInputMixin, ListableInputMixin):  # noqa: F821
-    field_type = FieldTypes.TEXT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.TEXT
     multiline: bool = Field(default=False)
     """Defines if the field will allow the user to open a text editor. Default is False."""
 
 
 class SecretStrInput(BaseInputMixin, DatabaseLoadMixin):
-    field_type = FieldTypes.PASSWORD
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.PASSWORD
     password: bool = Field(default=True)
 
 
 class IntInput(BaseInputMixin, ListableInputMixin, RangeMixin):
-    field_type = FieldTypes.INTEGER
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.INTEGER
 
 
 class FloatInput(BaseInputMixin, ListableInputMixin, RangeMixin):
-    field_type = FieldTypes.FLOAT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.FLOAT
 
 
 class BoolInput(BaseInputMixin, ListableInputMixin):
-    field_type = FieldTypes.BOOLEAN
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.BOOLEAN
 
 
 class NestedDictInput(BaseInputMixin, ListableInputMixin):
-    field_type = FieldTypes.NESTED_DICT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.NESTED_DICT
 
 
 class DictInput(BaseInputMixin, ListableInputMixin):
-    field_type = FieldTypes.DICT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.DICT
 
 
 class DropdownInput(BaseInputMixin, DropDownMixin):
-    field_type = FieldTypes.TEXT
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.TEXT
     options: Optional[Union[list[str], Callable]] = None
     """List of options for the field. Only used when is_list=True. Default is an empty list."""
 
 
 class FileInput(BaseInputMixin, ListableInputMixin, FileMixin):
-    field_type = FieldTypes.FILE
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.FILE

src/backend/base/langflow/template/__init__.py

@@ -2,6 +2,7 @@ from langflow.template.field.base import Input, Output
 from langflow.template.frontend_node.base import FrontendNode
 from langflow.template.template.base import Template
 
+
 __all__ = [
     "Input",
     "Output",

src/backend/base/langflow/template/template/base.py

@@ -2,13 +2,14 @@ from typing import Callable, Union
 
 from pydantic import BaseModel, model_serializer
 
+from langflow.inputs.input_mixin import BaseInputMixin
 from langflow.template.field.base import Input
 from langflow.utils.constants import DIRECT_TYPES
 
 
 class Template(BaseModel):
     type_name: str
-    fields: list[Input]
+    fields: list[Input | BaseInputMixin]
 
     def process_fields(
         self,