TypeOrm throws an error: ColumnTypeUndefinedError - the column type for #name is unspecified and cannot be inferred

An error occurred while trying to decorate the target with decorator:
^ ColumnTypeUndefinedError: The column type for Author#name is not defined and cannot be guessed. To fix this issue, make sure to enable "emitDecoratorMetadata" option in tsconfig.json. Additionally, ensure that you have imported "reflect-metadata" at the beginning of your main application file (before any entity imports). If you are using JavaScript instead of TypeScript, you must explicitly specify a column type.

Answer №1

To enable decorator metadata in your Typescript project, make sure to update your tsconfig file by uncommenting the line

"emitDecoratorMetadata": true,
. Additionally, you will need to install the reflect-metadata package. After installing the package, navigate to your application's main entry file (e.g., app.ts, index.ts, server.ts) and import reflect-metadata using the following steps:

npm install reflect-metadata

import "reflect-metadata";

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