refactor: Add MultilineMixin to StrInput for multiline input support and adapt validation

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

@@ -4,6 +4,8 @@ from typing import Annotated, Any, Optional
 from pydantic import BaseModel, ConfigDict, Field, PlainSerializer, field_validator, model_serializer
 
 from langflow.field_typing.range_spec import RangeSpec
+from langflow.inputs.validators import CoalesceBool
+from langflow.inputs.validators import CoalesceBool
 
 
 class FieldTypes(str, Enum):
@@ -123,3 +125,7 @@ class RangeMixin(BaseModel):
 class DropDownMixin(BaseModel):
     options: Optional[list[str]] = None
     """List of options for the field. Only used when is_list=True. Default is an empty list."""
+
+
+class MultilineMixin(BaseModel):
+    multiline: CoalesceBool = True

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

@@ -1,5 +1,6 @@
 from typing import Any, AsyncIterator, Callable, Iterator, Optional, Union
 
+from loguru import logger
 from pydantic import Field, field_validator
 
 from langflow.inputs.validators import CoalesceBool
@@ -13,6 +14,7 @@ from .input_mixin import (
     FieldTypes,
     FileMixin,
     ListableInputMixin,
+    MultilineMixin,
     RangeMixin,
     SerializableFieldTypes,
 )
@@ -49,12 +51,11 @@ class PromptInput(BaseInputMixin, ListableInputMixin):
 
 
 # Applying mixins to a specific input type
-class StrInput(BaseInputMixin, ListableInputMixin, DatabaseLoadMixin):  # noqa: F821
+class StrInput(BaseInputMixin, ListableInputMixin, DatabaseLoadMixin, MultilineMixin):
     field_type: Optional[SerializableFieldTypes] = FieldTypes.TEXT
     load_from_db: CoalesceBool = False
     """Defines if the field will allow the user to open a text editor. Default is False."""
 
-    @staticmethod
     def _validate_value(v: Any, _info):
         """
         Validates the given value and returns the processed value.
@@ -70,7 +71,8 @@ class StrInput(BaseInputMixin, ListableInputMixin, DatabaseLoadMixin):  # noqa:
             ValueError: If the value is not of a valid type or if the input is missing a required key.
         """
         if not isinstance(v, str) and v is not None:
-            raise ValueError(f"Invalid value type {type(v)}")
+            if _info.data.get("input_types") and v.__class__.__name__ not in _info.data.get("input_types"):
+                logger.warning(f"Invalid value type {type(v)}")
         return v
 
     @field_validator("value")
@@ -160,7 +162,7 @@ class TextInput(StrInput):
         return value
 
 
-class MultilineInput(BaseInputMixin):
+class MultilineInput(BaseInputMixin, MultilineMixin):
     """
     Represents a multiline input field.