'Migration from dataSource get the error: Cannot execute operation on "default" connection because connection is not yet established

My typeorm version is 0.3.6.

Whenever i tried to use dataSource.runMigration() i get this error,

MIGRATION ERROR:CannotExecuteNotConnectedError: Cannot execute operation on "default" connection because connection is not yet established.

i checked the url to migration files, it right. What am i missing?

data-source.ts

export const dataSource = new DataSource({
  host:__prod__ ?   process.env.HOST_PROD : process.env.HOST_DEV,
  type: "postgres",
  ...(__prod__
    ? {
        url: process.env.DATABASE_URL,
        username: process.env.PG_USERNAME_PROD,
        password: process.env.PG_PASSWORD_PROD,
        database: process.env.DATABASE_NAME_PROD,
      }
    : {
        username: process.env.PG_USERNAME_DEV,
        password: process.env.PG_PASSWORD_DEV,
        database: process.env.DATABASE_NAME_DEV,
      }),
  ...(__prod__
    ? {
        extra: {
          ssl: {
            rejectUnauthorized: false,
          },
        },
        ssl: true,
      }
    : {}),
  // ...(__prod__ ? {} : { synchronize: true }),
  logging: true,
  entities: [
    Admin,
    ...
  ],
  migrations: [join(__dirname,"/migrations/*")],
});

with prod variable is a boolean variable to check if app in production or not.

And i call it in index.ts

try {
    try {
 
       await dataSource.runMigrations();
    } catch (error) {
      console.log(`MIGRATION ERROR:${error}`)
    }
    await dataSource.initialize();
  } catch (error) {
    console.log(`TypeORM STARTING ERROR:${error}`);
  }

My file structure

server
---dist
------migrations/*.js
      ...
---src
      ...
------migrations/*.ts
typescriptpostgresqltypeorm


Solution 1:[1]

This could happen because you cannot read from ENV from data-source.ts. try include require("dotenv").config(); at the top of the file. Also, test your configuration by storing it in a const and console log it.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Phirun Tara

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