Orm Integration

Atlas ORM Integration

Use Atlas with your favorite ORM (GORM, Prisma, Sequelize, SQLAlchemy, TypeORM, Doctrine) to generate migrations from ORM models.

GORM Integration

Model Definition

package models

import (
  "database/sql"
  "gorm.io/gorm"
)

type User struct {
  ID    uint   `gorm:"primaryKey"`
  Email string `gorm:"uniqueIndex"`
  Name  string
  Posts []Post `gorm:"foreignKey:UserID"`
}

type Post struct {
  ID     uint
  Title  string `gorm:"index"`
  UserID uint
  User   User `gorm:"constraint:OnDelete:CASCADE"`
}

Atlas Configuration

// atlas.hcl
env "local" {
  url = "mysql://user:password@localhost/mydb"

  // Load schema from GORM models
  migration {
    dir = "file://migrations"
  }

  schema {
    // Point to your GORM models package
    src = "file://models"
  }
}

Generate & Apply Migrations

# Inspect current GORM schema
atlas schema inspect --env local

# Plan migrations from GORM models
atlas migrate diff gorm_migration --env local

# Apply migrations
atlas migrate apply --env local

GORM Best Practices

type User struct {
  ID        uint          `gorm:"primaryKey"`
  Email     string        `gorm:"uniqueIndex;not null"`
  Name      string
  CreatedAt time.Time     `gorm:"autoCreateTime"`
  UpdatedAt time.Time     `gorm:"autoUpdateTime"`

  // Define relationships
  Posts     []Post        `gorm:"foreignKey:UserID"`
}

type Post struct {
  ID        uint
  Title     string        `gorm:"index"`
  Content   string        `gorm:"type:text"`
  UserID    uint          `gorm:"not null"`
  User      User          `gorm:"constraint:OnDelete:CASCADE"`
  CreatedAt time.Time
}

Prisma Integration

Schema Definition

// schema.prisma
datasource db {
  provider = "mysql"
  url      = env("DATABASE_URL")
}

model User {
  id    Int     @id @default(autoincrement())
  email String  @unique
  name  String?
  posts Post[]  @relation("UserPosts")
}

model Post {
  id     Int    @id @default(autoincrement())
  title  String
  user   User   @relation("UserPosts", fields: [userId], references: [id], onDelete: Cascade)
  userId Int
}

Atlas Configuration

// atlas.hcl
env "local" {
  url = getenv("DATABASE_URL")

  migration {
    dir = "file://prisma/migrations"
  }

  // Generate from Prisma schema
  schema {
    src = "file://prisma/schema.prisma"
  }
}

Prisma Workflow

# Plan from Prisma schema
atlas migrate diff prisma_init --env local

# Apply migrations
atlas migrate apply --env local

# Check migration status
atlas migrate status --env local

Sequelize Integration

Model Definition

// models/User.js
module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define('User', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    email: {
      type: DataTypes.STRING,
      unique: true,
      allowNull: false
    },
    name: DataTypes.STRING
  });

  User.associate = (models) => {
    User.hasMany(models.Post, { foreignKey: 'userId' });
  };

  return User;
};

// models/Post.js
module.exports = (sequelize, DataTypes) => {
  const Post = sequelize.define('Post', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    title: DataTypes.STRING,
    userId: DataTypes.INTEGER
  });

  Post.associate = (models) => {
    Post.belongsTo(models.User, { foreignKey: 'userId' });
  };

  return Post;
};

Configuration

// atlas.hcl
env "local" {
  url = "mysql://root:password@localhost/mydb"

  migration {
    dir = "file://migrations"
  }

  schema {
    src = "file://models" // Point to models directory
  }
}

SQLAlchemy Integration

Model Definition

# models.py
from sqlalchemy import Column, Integer, String, ForeignKey, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    email = Column(String(255), unique=True, nullable=False)
    name = Column(String(255))
    posts = relationship("Post", back_populates="user", cascade="all, delete")

class Post(Base):
    __tablename__ = 'posts'

    id = Column(Integer, primary_key=True)
    title = Column(String(255))
    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
    user = relationship("User", back_populates="posts")

Atlas Configuration

// atlas.hcl
env "local" {
  url = "mysql+pymysql://root:password@localhost/mydb"

  migration {
    dir = "file://migrations"
  }

  schema {
    src = "file://models"
  }
}

TypeORM Integration

Entity Definition

// entities/User.ts
import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
import { Post } from "./Post";

@Entity("users")
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ unique: true })
  email: string;

  @Column({ nullable: true })
  name: string;

  @OneToMany(() => Post, post => post.user)
  posts: Post[];
}

// entities/Post.ts
import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
import { User } from "./User";

@Entity("posts")
export class Post {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  title: string;

  @Column()
  userId: number;

  @ManyToOne(() => User, user => user.posts, { onDelete: "CASCADE" })
  user: User;
}

Configuration

// atlas.hcl
env "local" {
  url = "mysql://root:password@localhost/mydb"

  migration {
    dir = "file://migrations"
  }

  schema {
    src = "file://dist/entities"  // Compiled JavaScript
  }
}

Django Integration

Model Definition

# models.py
from django.db import models

class User(models.Model):
    email = models.EmailField(unique=True)
    name = models.CharField(max_length=255, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = 'users'

class Post(models.Model):
    title = models.CharField(max_length=255)
    user = models.ForeignKey(User,
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = 'posts'

Atlas Configuration

// atlas.hcl
env "local" {
  url = "mysql://root:password@localhost/mydb"

  migration {
    dir = "file://migrations"
  }

  schema {
    src = "file://path/to/django/app"
  }
}

Doctrine (PHP) Integration

Entity Definition

<?php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity]
#[ORM\Table(name: 'users')]
class User {
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private int $id;

    #[ORM\Column(type: 'string', unique: true)]
    private string $email;

    #[ORM\OneToMany(targetEntity: Post::class, mappedBy: 'user')]
    private Collection $posts;
}

#[ORM\Entity]
#[ORM\Table(name: 'posts')]
class Post {
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private int $id;

    #[ORM\Column(type: 'string')]
    private string $title;

    #[ORM\ManyToOne(targetEntity: User::class, inversedBy: 'posts')]
    #[ORM\JoinColumn(name: 'user_id')]
    private User $user;
}

Common ORM Workflow

Step 1: Define Models in Your ORM

Update your ORM models with new fields, relationships, etc.

Step 2: Configure Atlas

Point Atlas to your ORM models directory.

Step 3: Plan Migrations

atlas migrate diff migration_name --env local

Step 4: Review Generated SQL

cat migrations/20240115_120000_migration_name.sql

Step 5: Apply Migrations

atlas migrate apply --env local

ORM-Specific Tips

GORM

• Use gorm:"index" for indexes
• Use gorm:"uniqueIndex" for unique indexes
• Use gorm:"constraint:OnDelete:CASCADE" for foreign keys
• Use gorm:"type:json" for JSON columns

Prisma

• Use @unique for unique constraints
• Use @db.Text for text fields
• Use onDelete: Cascade for foreign key actions
• Use @default(autoincrement()) for auto-increment

Sequelize

• Use autoIncrement: true for auto-increment
• Use unique: true for unique constraints
• Use allowNull: false for not null
• Use references: { model: 'table', key: 'id' } for foreign keys

SQLAlchemy

• Use unique=True for unique constraints
• Use nullable=False for not null
• Use ForeignKey() for foreign keys
• Use cascade="all, delete" for cascade delete

Multi-Model Example

# atlas.hcl with Prisma + custom SQL
env "local" {
  url = "mysql://root:password@localhost/mydb"

  migration {
    dir = "file://migrations"
  }

  # Load from Prisma + custom schema.sql
  schema {
    src = "file://prisma/schema.prisma"
    src = "file://schema/custom.sql"
  }
}

Best Practices

1. Keep ORM models as source of truth - Update models first, then apply migrations
2. Review generated SQL - Always check migrations before applying
3. Test in development - Run migrations locally before production
4. Version control migrations - Commit all migration files to git
5. Document schema changes - Add comments explaining migrations
6. Use constraints - Leverage ORM features for database constraints
7. Monitor performance - Index frequently queried columns

Resources

• GORM Guide: https://atlasgo.io/guides/orms/gorm
• Prisma Guide: https://atlasgo.io/guides/orms/prisma
• Sequelize Guide: https://atlasgo.io/guides/orms/sequelize
• SQLAlchemy Guide: https://atlasgo.io/guides/orms/sqlalchemy
• TypeORM Guide: https://atlasgo.io/guides/orms/typeorm

Local References

For complete ORM integration documentation, see:

• references/atlas-docs-full/guides/orms/gorm.md + guides/orms/gorm/* - Complete GORM guides
• references/atlas-docs-full/guides/orms/prisma.md - Prisma integration
• references/atlas-docs-full/guides/orms/sequelize.md + guides/orms/sequelize/* - Complete Sequelize guides
• references/atlas-docs-full/guides/orms/sqlalchemy.md - SQLAlchemy integration
• references/atlas-docs-full/guides/orms/typeorm.md + guides/orms/typeorm/* - Complete TypeORM guides
• references/atlas-docs-full/guides/orms/doctrine.md - Doctrine (PHP) integration
• references/atlas-docs-full/guides/orms/django.md - Django integration
• references/atlas-docs-full/guides/orms/ - All ORM integration guides
• references/README.md - Full documentation index

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