feat: Enhance Data Components and Add SelectData Functionality (#3715)

## Changes Overview

This PR introduces several enhancements to our data handling components and removes some legacy code:

1. **CreateData and UpdateData Components**:
   - Added text key name validation
   - Enhanced UpdateData to support updating and appending multiple data points
   - Implemented optional text key validator for dynamically loaded data
   - Updated component names, descriptions, and default values

2. **New SelectData Component**:
   - Implemented SelectDataComponent for data selection from a list
   - Added inputs for data list and index selection
   - Implemented error handling for out-of-range index selection

3. **Code Cleanup**:
   - Removed legacy post_code_processing methods from CreateDataComponent and UpdateDataComponent
   - Removed corresponding test cases

4. **Testing**:
   - Added unit tests for CreateData and UpdateData components
   - Updated test file names for consistency

src/backend/tests/unit/components/prototypes/test_create_data_component.py

@@ -0,0 +1,117 @@
+import pytest
+from langflow.components.prototypes.CreateData import CreateDataComponent
+from langflow.schema import Data
+
+
+@pytest.fixture
+def create_data_component():
+    return CreateDataComponent()
+
+
+def test_update_build_config(create_data_component):
+    build_config = {
+        "number_of_fields": {
+            "type": "int",
+            "value": 2,
+        },
+        "text_key": {
+            "type": "str",
+            "value": "",
+        },
+        "text_key_validator": {
+            "type": "bool",
+            "value": False,
+        },
+    }
+    updated_config = create_data_component.update_build_config(
+        build_config=build_config, field_value=3, field_name="number_of_fields"
+    )
+
+    assert "field_1_key" in updated_config
+    assert "field_2_key" in updated_config
+    assert "field_3_key" in updated_config
+    assert updated_config["number_of_fields"]["value"] == 3
+
+
+def test_update_build_config_exceed_limit(create_data_component):
+    build_config = {
+        "number_of_fields": {
+            "type": "int",
+            "value": 2,
+        },
+        "text_key": {
+            "type": "str",
+            "value": "",
+        },
+        "text_key_validator": {
+            "type": "bool",
+            "value": False,
+        },
+    }
+    with pytest.raises(
+        ValueError, match="Number of fields cannot exceed 15. Try using a Component to combine two Data."
+    ):
+        create_data_component.update_build_config(build_config, 16, "number_of_fields")
+
+
+@pytest.mark.asyncio
+async def test_build_data(create_data_component):
+    create_data_component._attributes = {
+        "field_1_key": {"key1": "value1"},
+        "field_2_key": {"key2": "value2"},
+    }
+    create_data_component.text_key = "key1"
+    create_data_component.text_key_validator = False
+
+    result = await create_data_component.build_data()
+
+    assert isinstance(result, Data)
+    assert result.data == {"key1": "value1", "key2": "value2"}
+    assert result.text_key == "key1"
+
+
+def test_get_data(create_data_component):
+    create_data_component._attributes = {
+        "field_1_key": {"key1": "value1"},
+        "field_2_key": {"key2": "value2"},
+    }
+
+    result = create_data_component.get_data()
+
+    assert result == {"key1": "value1", "key2": "value2"}
+
+
+def test_validate_text_key_valid(create_data_component):
+    # Arrange
+    create_data_component._attributes = {
+        "field_1_key": {"key1": "value1"},
+        "field_2_key": {"key2": "value2"},
+    }
+    create_data_component.text_key = "key1"
+
+    # Act & Assert
+    try:
+        create_data_component.validate_text_key()
+    except ValueError:
+        pytest.fail("validate_text_key() raised ValueError unexpectedly!")
+
+    # Additional assertions
+    assert create_data_component.text_key == "key1"
+    assert "key1" in create_data_component.get_data()
+
+
+def test_validate_text_key_invalid(create_data_component):
+    # Arrange
+    create_data_component._attributes = {
+        "field_1_key": {"key1": "value1"},
+        "field_2_key": {"key2": "value2"},
+    }
+    create_data_component.text_key = "invalid_key"
+
+    # Act & Assert
+    with pytest.raises(ValueError) as exc_info:
+        create_data_component.validate_text_key()
+
+    # Check for the exact error message
+    expected_error_message = f"Text Key: '{create_data_component.text_key}' not found in the Data keys: '{', '.join(create_data_component.get_data().keys())}'"
+    assert str(exc_info.value) == expected_error_message

src/backend/tests/unit/components/prototypes/test_update_data_component.py

@@ -0,0 +1,105 @@
+import pytest
+from langflow.components.prototypes.UpdateData import UpdateDataComponent
+from langflow.schema import Data
+
+
+@pytest.fixture
+def update_data_component():
+    return UpdateDataComponent()
+
+
+def test_update_build_config(update_data_component):
+    build_config = {
+        "number_of_fields": {
+            "type": "int",
+            "value": 2,
+        },
+        "text_key": {
+            "type": "str",
+            "value": "",
+        },
+        "text_key_validator": {
+            "type": "bool",
+            "value": False,
+        },
+    }
+    updated_config = update_data_component.update_build_config(
+        build_config=build_config, field_value=3, field_name="number_of_fields"
+    )
+
+    assert "field_1_key" in updated_config
+    assert "field_2_key" in updated_config
+    assert "field_3_key" in updated_config
+    assert updated_config["number_of_fields"]["value"] == 3
+
+
+def test_update_build_config_exceed_limit(update_data_component):
+    build_config = {
+        "number_of_fields": {
+            "type": "int",
+            "value": 2,
+        },
+        "text_key": {
+            "type": "str",
+            "value": "",
+        },
+        "text_key_validator": {
+            "type": "bool",
+            "value": False,
+        },
+    }
+    with pytest.raises(
+        ValueError, match="Number of fields cannot exceed 15. Try using a Component to combine two Data."
+    ):
+        update_data_component.update_build_config(build_config, 16, "number_of_fields")
+
+
+@pytest.mark.asyncio
+async def test_build_data(update_data_component):
+    update_data_component._attributes = {
+        "field_1_key": {"key1": "new_value1"},
+        "field_2_key": {"key3": "value3"},
+    }
+    update_data_component.text_key = "key1"
+    update_data_component.text_key_validator = False
+    update_data_component.old_data = Data(data={"key1": "old_value1", "key2": "value2"}, text_key="key2")
+
+    result = await update_data_component.build_data()
+
+    assert isinstance(result, Data)
+    assert result.data == {"key1": "new_value1", "key2": "value2", "key3": "value3"}
+    assert result.text_key == "key1"
+
+
+def test_get_data(update_data_component):
+    update_data_component._attributes = {
+        "field_1_key": {"key1": "value1"},
+        "field_2_key": {"key2": "value2"},
+    }
+
+    result = update_data_component.get_data()
+
+    assert result == {"key1": "value1", "key2": "value2"}
+
+
+def test_validate_text_key_valid(update_data_component):
+    data = Data(data={"key1": "value1", "key2": "value2"}, text_key="key1")
+    update_data_component.text_key = "key1"
+
+    try:
+        update_data_component.validate_text_key(data)
+    except ValueError:
+        pytest.fail("validate_text_key() raised ValueError unexpectedly!")
+
+
+def test_validate_text_key_invalid(update_data_component):
+    data = Data(data={"key1": "value1", "key2": "value2"}, text_key="key1")
+    update_data_component.text_key = "invalid_key"
+
+    with pytest.raises(ValueError) as exc_info:
+        update_data_component.validate_text_key(data)
+
+    expected_error_message = (
+        f"Text Key: {update_data_component.text_key} not found in the Data keys: {','.join(data.data.keys())}"
+    )
+    assert str(exc_info.value) == expected_error_message