Crud enhancement

[igorbenav]

Crud Enhancement

Added

• Advanced filters (Django ORM style)
• Optional Bulk Operations
• Custom soft delete mechanisms in FastCRUD, EndpointCreator and crud_router
• Tests for new features

Detailed

---

Using EndpointCreator and crud_router with Custom Soft Delete Columns

When initializing crud_router or creating a custom EndpointCreator, you can pass the names of your custom soft delete columns through the FastCRUD initialization. This informs FastCRUD which columns to check and update for soft deletion operations.

Here's an example of using crud_router with custom soft delete columns:

from fastapi import FastAPI
from fastcrud import FastCRUD, crud_router
from sqlalchemy.ext.asyncio import AsyncSession

app = FastAPI()

# Assuming async_session is your AsyncSession generator
# and MyModel is your SQLAlchemy model

# Initialize FastCRUD with custom soft delete columns
my_model_crud = FastCRUD(MyModel,
                         is_deleted_column='archived',  # Custom 'is_deleted' column name
                         deleted_at_column='archived_at'  # Custom 'deleted_at' column name
                        )

# Setup CRUD router with the FastCRUD instance
app.include_router(crud_router(
    session=async_session,
    model=MyModel,
    crud=my_model_crud,
    create_schema=CreateMyModelSchema,
    update_schema=UpdateMyModelSchema,
    delete_schema=DeleteMyModelSchema,
    path="/mymodel",
    tags=["MyModel"]
))

This setup ensures that the soft delete functionality within your application utilizes the archived and archived_at columns for marking records as deleted, rather than the default is_deleted and deleted_at fields.

---

Updating Multiple Records

To update multiple records, you can set the allow_multiple=True parameter in the update method. This allows FastCRUD to apply the update to all records matching the given filters.

# Assuming setup for FastCRUD instance `item_crud` and SQLAlchemy async session `db`

# Update all items priced below $10 to a new price
await item_crud.update(
    db=db,
    object={"price": 9.99},
    allow_multiple=True,
    price__lt=10
)

Deleting Multiple Records

Similarly, you can delete multiple records by using the allow_multiple=True parameter in the delete or db_delete method, depending on whether you're performing a soft or hard delete.

# Soft delete all items not sold in the last year
await item_crud.delete(
    db=db,
    allow_multiple=True,
    last_sold__lt=datetime.datetime.now() - datetime.timedelta(days=365)
)

---

Advanced Filters

FastCRUD supports advanced filtering options, allowing you to query records using operators such as greater than (__gt), less than (__lt), and their inclusive counterparts (__gte, __lte). These filters can be used in any method that retrieves or operates on records, including get, get_multi, exists, count, update, and delete.

Using Advanced Filters

The following examples demonstrate how to use advanced filters for querying and manipulating data:

Fetching Records with Advanced Filters

# Fetch items priced between $5 and $20
items = await item_crud.get_multi(
    db=db,
    price__gte=5,
    price__lte=20
)

Counting Records

# Count items added in the last month
item_count = await item_crud.count(
    db=db,
    added_at__gte=datetime.datetime.now() - datetime.timedelta(days=30)
)