feat: dropdown combobox option (#2991)

* Removed default variable as true

* added combobox to dropdown

* Fixed types on strRenderComponents

* Added type of combobox

* Created combobox option on backend

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/base/langflow/base/constants.py

@@ -20,6 +20,7 @@ FIELD_FORMAT_ATTRIBUTES = [
     "required",
     "list",
     "multiline",
+    "combobox",
     "fileTypes",
     "password",
     "input_types",

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

@@ -141,6 +141,11 @@ class MultilineMixin(BaseModel):
     multiline: CoalesceBool = True
 
 
+class ComboboxMixin(BaseModel):
+    combobox: CoalesceBool = False
+    """Variable that defines if the user can insert custom values in the dropdown."""
+
+
 class TableMixin(BaseModel):
     table_schema: Optional[TableSchema | list[Column]] = None
 

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

@@ -11,6 +11,7 @@ from .input_mixin import (
     BaseInputMixin,
     DatabaseLoadMixin,
     DropDownMixin,
+    ComboboxMixin,
     FieldTypes,
     FileMixin,
     InputTraceMixin,
@@ -292,7 +293,7 @@ class DictInput(BaseInputMixin, ListableInputMixin, InputTraceMixin):
     value: Optional[dict] = {}
 
 
-class DropdownInput(BaseInputMixin, DropDownMixin, MetadataTraceMixin):
+class DropdownInput(BaseInputMixin, DropDownMixin, MetadataTraceMixin, ComboboxMixin):
     """
     Represents a dropdown input field.
 
@@ -307,6 +308,7 @@ class DropdownInput(BaseInputMixin, DropDownMixin, MetadataTraceMixin):
 
     field_type: Optional[SerializableFieldTypes] = FieldTypes.TEXT
     options: list[str] = Field(default_factory=list)
+    combobox: CoalesceBool = False
 
 
 class MultiselectInput(BaseInputMixin, ListableInputMixin, DropDownMixin, MetadataTraceMixin):