fix: Problem in the description field when using the MariaDB or MySQL (#3431)

* fix: Problem in the description field when using the MariaDB or MySQL database.

* fix: Problem in the description field when using the MariaDB or MySQL database.

* fix: Add the migration script to update description columns type.

* [autofix.ci] apply automated fixes

* Update src/backend/base/langflow/alembic/versions/1d90f8a0efe1_update_description_columns_type.py

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

---------

Co-authored-by: Marcelo Nunes <marcelo.nunes@nava.com.br>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

src/backend/base/langflow/alembic/versions/1d90f8a0efe1_update_description_columns_type.py

@@ -0,0 +1,70 @@
+"""Update description columns type
+
+Revision ID: 4522eb831f5c
+Revises: 0d60fcbd4e8e
+Create Date: 2024-08-20 11:46:56.266061
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from langflow.utils import migration
+from sqlalchemy.engine.reflection import Inspector
+
+# revision identifiers, used by Alembic.
+revision: str = "4522eb831f5c"
+down_revision: Union[str, None] = "0d60fcbd4e8e"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    # ### commands auto generated by Alembic - please adjust! ###
+    inspector = Inspector.from_engine(conn)  # type: ignore
+
+    with op.batch_alter_table("flow", schema=None) as batch_op:
+        if migration.column_exists(table_name="flow", column_name="description", conn=conn):
+            columns = inspector.get_columns("flow")
+            description_column = next((column for column in columns if column["name"] == "description"), None)
+            if description_column is not None and isinstance(description_column["type"], sa.VARCHAR):
+                batch_op.alter_column(
+                    "description", existing_type=sa.VARCHAR(), type_=sa.Text(), existing_nullable=True
+                )
+
+    with op.batch_alter_table("folder", schema=None) as batch_op:
+        if migration.column_exists(table_name="folder", column_name="description", conn=conn):
+            columns = inspector.get_columns("folder")
+            description_column = next((column for column in columns if column["name"] == "description"), None)
+            if description_column is not None and isinstance(description_column["type"], sa.VARCHAR):
+                batch_op.alter_column(
+                    "description", existing_type=sa.VARCHAR(), type_=sa.Text(), existing_nullable=True
+                )
+
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    # ### commands auto generated by Alembic - please adjust! ###
+    inspector = Inspector.from_engine(conn)  # type: ignore
+    with op.batch_alter_table("folder", schema=None) as batch_op:
+        if migration.column_exists(table_name="folder", column_name="description", conn=conn):
+            columns = inspector.get_columns("folder")
+            description_column = next((column for column in columns if column["name"] == "description"), None)
+            if description_column is not None and isinstance(description_column["type"], sa.VARCHAR):
+                batch_op.alter_column(
+                    "description", existing_type=sa.VARCHAR(), type_=sa.Text(), existing_nullable=True
+                )
+
+    with op.batch_alter_table("flow", schema=None) as batch_op:
+        if migration.column_exists(table_name="flow", column_name="description", conn=conn):
+            columns = inspector.get_columns("flow")
+            description_column = next((column for column in columns if column["name"] == "description"), None)
+            if description_column is not None and isinstance(description_column["type"], sa.VARCHAR):
+                batch_op.alter_column(
+                    "description", existing_type=sa.VARCHAR(), type_=sa.Text(), existing_nullable=True
+                )
+    # ### end Alembic commands ###

src/backend/base/langflow/services/database/models/flow/model.py

@@ -10,7 +10,7 @@ import emoji
 from emoji import purely_emoji  # type: ignore
 from fastapi import HTTPException, status
 from pydantic import field_serializer, field_validator
-from sqlalchemy import UniqueConstraint
+from sqlalchemy import UniqueConstraint, Text
 from sqlmodel import JSON, Column, Field, Relationship, SQLModel
 
 from langflow.schema import Data
@@ -25,7 +25,7 @@ if TYPE_CHECKING:
 
 class FlowBase(SQLModel):
     name: str = Field(index=True)
-    description: Optional[str] = Field(index=True, nullable=True, default=None)
+    description: Optional[str] = Field(default=None, sa_column=Column(Text, index=True, nullable=True))
     icon: Optional[str] = Field(default=None, nullable=True)
     icon_bg_color: Optional[str] = Field(default=None, nullable=True)
     data: Optional[Dict] = Field(default=None, nullable=True)

src/backend/base/langflow/services/database/models/folder/model.py

@@ -1,8 +1,8 @@
 from typing import TYPE_CHECKING, List, Optional
 from uuid import UUID, uuid4
 
-from sqlalchemy import UniqueConstraint
+from sqlalchemy import UniqueConstraint, Text
-from sqlmodel import Field, Relationship, SQLModel
+from sqlmodel import Field, Relationship, SQLModel, Column
 
 from langflow.services.database.models.flow.model import FlowRead
 
@@ -13,7 +13,7 @@ if TYPE_CHECKING:
 
 class FolderBase(SQLModel):
     name: str = Field(index=True)
-    description: Optional[str] = Field(default=None)
+    description: Optional[str] = Field(default=None, sa_column=Column(Text))
 
 
 class Folder(FolderBase, table=True):  # type: ignore