fastapi-crud-code-generator 0.0.2

FastaAPI's CRUD project generator for SQLALchemy.

Fastapi CRUD Project Generator

A code generator that help you to establish a fastapi project with CRUD router from your Sqlalchemy model. Which supports following api:

• Get one
• Get many
• Insert one
• Insert many
• Update one
• Update many
• Patch one
• Patch many
• Delete one
• Delete many

Quick Start with in-memory DB (or see the other (example)

Install

pip install fastapi-crud-code-generator

Prepare your Sqlalchemy schema

• You can use sqlacodegen to generate SQLAlchemy models for your table. This project is based on the model development and testing generated by sqlacodegen

from sqlalchemy import *
from sqlalchemy.orm import declarative_base

Base = declarative_base()
metadata = Base.metadata

class SampleTable(Base):
    __tablename__ = 'test_build_myself_memory'
    __table_args__ = (
        UniqueConstraint('primary_key', 'int4_value', 'float4_value'),
    )
    primary_key = Column(Integer, primary_key=True, autoincrement=True)
    bool_value = Column(Boolean, nullable=False, default=False)
    bytea_value = Column(LargeBinary)
    char_value = Column(CHAR(10, collation='NOCASE'))
    date_value = Column(Date)
    float4_value = Column(Float, nullable=False)
    float8_value = Column(Float(53), nullable=False, default=10.10)
    int2_value = Column(SmallInteger, nullable=False)
    int4_value = Column(Integer, nullable=False)
    int8_value = Column(BigInteger, default=99)
    text_value = Column(Text)
    varchar_value = Column(String)

class SampleTableTwo(Base):
    __tablename__ = 'test_build_myself_memory_two'
    primary_key = Column(Integer, primary_key=True, autoincrement=True)
    bool_value = Column(Boolean, nullable=False, default=False)
    bytea_value = Column(LargeBinary)

Use crud_router_builder() to generate the project from the executing folder (using in-memory sqlite db here)

from fastapi_quickcrud_codegen.db_model import DbModel
from fastapi_quickcrud_codegen.misc.type import CrudMethods

from fastapi_quickcrud_codegen import crud_router_builder

model_list = [DbModel(db_model=SampleTable, prefix="/my_first_api", tags=["sample api"],
                      exclude_columns=['bytea_value']),
              DbModel(db_model=SampleTableTwo, prefix="/my_second_api", tags=["sample api"],
                      exclude_columns=['bytea_value'],crud_methods=[CrudMethods.FIND_ONE])]
crud_router_builder(
    db_model_list=model_list,
    # is_async=True,
    # database_url="sqlite+aiosqlite://",
    is_async=False,
    database_url="sqlite://"
)

crud_router_builder args

• db_model_list [Required[List[DbModel]]]

  Model list of dict for code generate

  • List[]
    • DbModel
      • db_model [Required[DeclarativeMeta]]
      • prefix [Required[str]]

        prefix for Fastapi's end point

      • tags [Required[List[str]]]

        list of tag for Fastapi's end point

      • exclude_columns [Optional[List[str]]]

        set the columns that not to be operated but the columns should nullable or set the default value)

      • crud_methods [Opional[List[CrudMethods]]]

        • Create the following apis for that model, but default: [CrudMethods.FIND_MANY, CrudMethods.FIND_ONE, CrudMethods.CREATE_MANY, CrudMethods.PATCH_ONE, CrudMethods.PATCH_MANY, CrudMethods.PATCH_ONE, CrudMethods.UPDATE_MANY, CrudMethods.UPDATE_ONE, CrudMethods.DELETE_MANY, CrudMethods.DELETE_ONE]

        - CrudMethods.FIND_ONE
        - CrudMethods.FIND_MANY
        - CrudMethods.UPDATE_ONE
        - CrudMethods.UPDATE_MANY
        - CrudMethods.PATCH_ONE
        - CrudMethods.PATCH_MANY
        - CrudMethods.CREATE_ONE
        - CrudMethods.CREATE_MANY
        - CrudMethods.DELETE_ONE
        - CrudMethods.DELETE_MANY
        

• is_async [Required]

  True for async; False for sync

• database_url [Optional (str)]

  A database URL. The URL is passed directly to SQLAlchemy's create_engine() method so please refer to SQLAlchemy's documentation for instructions on how to construct a proper URL.

Known limitations

• ❌ Please use composite unique constraints instead instead multiple unique constraints
• ❌ Composite primary key is not supported
• ❌ Sqlalchemy table type model schema is not supported

Design:

The model generation part and api router part refer to my another project; The code generation part is using Jinja

How to contribute more apis?

It will be super excited if you have any idea with api router/ model template. then you can follow the step as below to try to contribute.

1. Model generation
   1. Prepare Jinja template to fastapi-crud-project-generator/src/fastapi_quickcrud_codegen/model/template
   2. Prepare model code generation method from fastapi_quickcrud_codegen.utils.schema_builder.ApiParameterSchemaBuilder
   3. Generate the code from fastapi_quickcrud_codegen/model/model_builder.py
2. CRUD Method Generation
   1. After the model generation, you can try to build your own api by your own model
   2. Modify fastapi_quickcrud_codegen.utils.sqlalchemy_to_pydantic.sqlalchemy_to_pydantic, fastapi_quickcrud_codegen.misc.type.CrudMethods and fastapi_quickcrud_codegen.misc.crud_model.CRUDModel to let project supports your api
   3. Prepare your api router Jinja template from src/fastapi_quickcrud_codegen/model/template/route
   4. Generate the code from fastapi_quickcrud_codegen/model/crud_builder.py
   5. Update the api_register from src/fastapi_quickcrud_codegen/crud_generator.py

• use Sqlalchemy's sql.expression instead custom statement when building sql statement for your api

Road map

Current State: Pre-release

Will be changed to stable version when:

• Typing

After stable version:

• Support foreign tree in find api
• Support foreign tree in insert api
• Support foreign tree in update api
• Support foreign tree in delete api

Good to have:

• Support Sqlalchemy Table type model