Typeorm's migration:generate regenerates the whole database schema

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Every time I run migration:generate, it creates a migration that regenerates the entire database schema (rather than a migration for just the recent changes to my entities). I'm using Typeorm version 0.2.7, the latest version.

My ormconfig.json is:

{
  "host": "localhost",
  "logging": false,
  "port": 5432,
  "synchronize": false,
  "type": "postgres",

  "entities": ["build/server/entity/*.js"],
  "migrations": ["build/server/migration/*.js"],

  "cli": {
    "entitiesDir": "build/server/entity",
    "migrationsDir": "build/server/migration"
  },

  "username": "***",
  "password": "***",
  "database": "***"
}

When I run typeorm migration:generate -n SomeEntityChanges, the new migration file contains instructions for creating and linking up tables for all my entities, even though most of them already have corresponding migrations in build/server/migration.

When I run typeorm migration:run, I can see that there are no pending migrations, and that the migrations that cover the existing entities have been run (i.e. they're in my migrations table).

What am I missing? The docs say that the migration:generate command should just generate a migration with the recent changes.

It is because your database is probably empty. TypeOrm computes the diff between your actual codebase entities and your actual database, thus generating the migration.

Check your ormconfig.json, as it is what is read by typeorm CLI to generate the migration, it probably points to an empty database, thus generating all tables in the migration.

Just migrate on your database, and run generate again.

TypeORM By Example: Part 1, typeorm. ORM for TypeScript and JavaScript (ES7, ES6, ES5). Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, SAP Hana, WebSQL  TypeORM is an ORM that can run in NodeJS, Browser, Cordova, PhoneGap, Ionic, React Native, NativeScript, Expo, and Electron platforms and can be used with TypeScript and JavaScript (ES5, ES6, ES7, ES8).

I kept having this issue on MySQL and after hours of tinkering I finally resolved the problem.

Assuming the { schema: "public" } fix didn't work for you, here are the actions I had to take to clean up a terrible migration generation.

First of all, make sure you're running the latest version of TypeORM. I was down by a few minor version, and this alone was enough to give me countless index-based errors.

If you're up to date, great! Here's the bad news: your entities are wrong. The biggest issue I kept running into was the default property on most of my duplications. From what I've come to understand, both Postgres and MySQL return different-than-expected results when TypeORM is trying to compare database defaults to the defined default.

For example: on a type "decimal" with a 4-digit trailing decimal, default: 0 works fine when building your column, but MySQL actually returns "0.0000", meaning no matter how many times you run this update, the default will never be a literal zero. TypeORM sees this being different, and wants to change the existing MySQL default back to a normal zero.

This error spanned across everything from default: null to "tinyint" booleans being listed as int in my schema.

Read the generated output carefully and check each entity for the property being mentioned. Some of this was fixed by updating to the latest version of TypeORM, but I managed to completely clear almost 250 table alterations by ensuring the default data actually matched what MySQL stores.

Object-Relational Mapping in Node.js with Sequelize, Get unlimited public & private packages + package-based permissions with npm Pro.Get started ». typeorm. 0.2.25 • Public • Published 6 days  TypeORM is an ORM that can run in NodeJS, Browser, Cordova, PhoneGap and Ionic platforms and can be used with TypeScript and JavaScript (ES5, ES6, ES7).

Removing {schema: 'public'} from the all of my @Entity definitions fixed it for me with Postgresql

Previous: @Entity({schema: 'public'})

Working: @Entity()

is an ORM that can run in NodeJS, Browser, Cordova, PhoneGap, Ionic, React Native, NativeScript, Expo, and Electron platforms and can be used with TypeScript and JavaScript (ES5, ES6, ES7, ES8). The available column types differ between databases like MySQL and Postgres. You can look them up in the TypeORM documentation. It is a proper moment to discuss different ways to store strings in Postgres. Relying on TypeORM to figure out the type of a string column results in the “character varying” type, also called varchar.

that converts data between JavaScript / TypeScript to a variety of databases: MySQL / MariaDB / Postgres / SQLite / Microsoft SQL Server / Oracle / sql. js. The final result of this part is available for download. What is TypeORM? It supports both Active Record and Data Mapper patterns, unlike all other JavaScript ORMs currently in existence, which means you can write high quality, loosely coupled, scalable, maintainable applications the most productive way. TypeORM is a tool in the Microframeworks (Backend) category of a tech stack.

) is the process of mapping between objects and relational database systems. So it acts like an interface between two systems hiding details about an underlying mechanism. Getting started with NestJS & TypeORM (+bonus NestJS Admin) May 28, 2019 Quentin Somerville 11 min read NestJS is one of the most complete NodeJS Framework in the NodeJs ecosystem.

TypeORM is definitely the most mature Object Relational Mapper (ORM) available in the node.js world. Since it's written in TypeScript, it works pretty well with the  Typeform uses our own and third-party cookies. The inedible ones help us learn how you use our site, and show you relevant content and ads based on your browsing history. The edible ones get us through the afternoon slump 😉. You can read our cookie policy, change your cookie preferences, or continue browsing to accept all cookies. Cookie policy

Comments
  • I also have the same problem with postgres :-?
  • @hungneox try removing {schema: 'public'} if you have it in your Entities
  • I'm running into the same problem on a clean database which generates the correct migration the first time, populates the database with the entities, then generates the same migration the second time. Database is definitely not empty.
  • Having the same problem on MySQL with nothing like { schema: "public" } in my code.