feat: Add default value support for table columns (#4043)

* Add 'type', 'description', and 'default' fields to Table schema and enhance formatter validation

* Add type-based mapping to formatter validator in table schema

* Add default value support for new table rows in TableNodeComponent

* Add optional 'description' and 'default' fields to ColumnField interface

* Add default value inference for table columns in utils.ts

- Initialize 'default' property for table columns to null.
- Infer default value from the first row of data if available.
- Adjust column formatter determination based on sample value.

* Add default table input validation and update formatter logic in Column model

* Add unit tests for Column class in table schema module

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

src/backend/base/langflow/schema/table.py

@@ -1,6 +1,8 @@
 from enum import Enum
 
-from pydantic import BaseModel, Field, field_validator
+from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator
+
+VALID_TYPES = ["date", "number", "text", "json", "integer", "int", "float", "str", "string"]
 
 
 class FormatterType(str, Enum):
@@ -11,19 +13,35 @@ class FormatterType(str, Enum):
 
 
 class Column(BaseModel):
-    display_name: str
+    model_config = ConfigDict(populate_by_name=True)
     name: str
+    display_name: str = Field(default="")
     sortable: bool = Field(default=True)
     filterable: bool = Field(default=True)
-    formatter: FormatterType | str | None = None
-
-    @field_validator("formatter")
+    formatter: FormatterType | str | None = Field(default=None, alias="type")
+    description: str | None = None
+    default: str | None = None
+
+    @model_validator(mode="after")
+    def set_display_name(self):
+        if not self.display_name:
+            self.display_name = self.name
+        return self
+
+    @field_validator("formatter", mode="before")
+    @classmethod
     def validate_formatter(cls, value):
+        if value in ["integer", "int", "float"]:
+            value = FormatterType.number
+        if value in ["str", "string"]:
+            value = FormatterType.text
+        if value == "dict":
+            value = FormatterType.json
         if isinstance(value, str):
             return FormatterType(value)
         if isinstance(value, FormatterType):
             return value
-        msg = "Invalid formatter type"
+        msg = f"Invalid formatter type: {value}. Valid types are: {FormatterType}"
         raise ValueError(msg)
 
 

src/backend/tests/unit/io/test_table_schema.py

@@ -0,0 +1,60 @@
+# Generated by qodo Gen
+
+import pytest
+
+from langflow.schema.table import Column, FormatterType
+
+
+@pytest.fixture
+def client():
+    pass
+
+
+class TestColumn:
+    # Creating a Column instance without display_name sets it to the name
+    def test_create_column_without_display_name(self):
+        column = Column(name="test_column")
+        assert column.display_name == "test_column"
+
+    # Creating a Column instance with valid formatter values
+    def test_create_column_with_valid_formatter(self):
+        column = Column(display_name="Test Column", name="test_column", formatter="date")
+        assert column.formatter == FormatterType.date
+
+    # Formatter is set based on provided formatter value
+    def test_formatter_set_based_on_value(self):
+        column = Column(display_name="Test Column", name="test_column", formatter="int")
+        assert column.formatter == FormatterType.number
+
+    # Default values for sortable and filterable are set to True
+    def test_default_sortable_filterable(self):
+        column = Column(display_name="Test Column", name="test_column")
+        assert column.sortable is True
+        assert column.filterable is True
+
+    # Ensure formatter field is correctly set when provided a FormatterType
+    def test_formatter_explicitly_set_to_enum(self):
+        column = Column(display_name="Date Column", name="date_column", formatter=FormatterType.date)
+        assert column.formatter == FormatterType.date
+
+    # Invalid formatter raises ValueError
+    def test_invalid_formatter_raises_value_error(self):
+        with pytest.raises(ValueError):
+            Column(display_name="Invalid Column", name="invalid_column", formatter="invalid")
+
+    # Formatter is None when not provided
+    def test_formatter_none_when_not_provided(self):
+        column = Column(display_name="Test Column", name="test_column")
+        assert column.formatter is None
+
+    # Description and default can be set
+    def test_description_and_default(self):
+        column = Column(
+            display_name="Test Column", name="test_column", description="A test column", default="default_value"
+        )
+        assert column.description == "A test column"
+        assert column.default == "default_value"
+
+    def test_create_with_type_instead_of_formatter(self):
+        column = Column(display_name="Test Column", name="test_column", type="date")
+        assert column.formatter == FormatterType.date

src/frontend/src/components/parameterRenderComponent/components/TableNodeComponent/index.tsx

@@ -92,7 +92,7 @@ export default function TableNodeComponent({
   function addRow() {
     const newRow = {};
     componentColumns.forEach((column) => {
-      newRow[column.name] = null;
+      newRow[column.name] = column.default ?? null; // Use the default value if available
     });
     handleOnNewValue({ value: [...value, newRow] });
   }

src/frontend/src/types/utils/functions.ts

@@ -16,10 +16,12 @@ export enum FormatterType {
   json = "json",
 }
 
-export type ColumnField = {
-  display_name: string;
+export interface ColumnField {
   name: string;
+  display_name: string;
   sortable: boolean;
   filterable: boolean;
   formatter?: FormatterType;
-};
+  description?: string;
+  default?: any; // Add this line
+}

src/frontend/src/utils/utils.ts

@@ -528,7 +528,18 @@ export function generateBackendColumnsFromValue(rows: Object[]): ColumnField[] {
       display_name: column.headerName ?? "",
       sortable: true,
       filterable: true,
+      default: null, // Initialize default to null or appropriate value
     };
+
+    // Attempt to infer the default value from the data, if possible
+    if (rows.length > 0) {
+      const sampleValue = rows[0][column.field ?? ""];
+      if (sampleValue !== undefined) {
+        newColumn.default = sampleValue;
+      }
+    }
+
+    // Determine the formatter based on the sample value
     if (rows[0] && rows[0][column.field ?? ""]) {
       const value = rows[0][column.field ?? ""] as any;
       if (typeof value === "string") {
@@ -538,7 +549,6 @@ export function generateBackendColumnsFromValue(rows: Object[]): ColumnField[] {
           newColumn.formatter = FormatterType.text;
         }
       } else if (typeof value === "object" && value !== null) {
-        // Check if the object is a Date object
         if (
           Object.prototype.toString.call(value) === "[object Date]" ||
           value instanceof Date