Cannot set property EntityManager of #<Object> which has only a getter
Problem
Issue type: [x] bug report Database system/driver: [x] `postgres` TypeORM version: [x] `latest` Steps to reproduce or a small repository showing the problem: [code block] Somehow getting this random error now and have. Literally tried rolling back my code and everything. Any suggestions where to look?
Error Output
Error: Cannot set property EntityManager of #<Object> which has only a getter
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1 Fix
Fix EntityManager Getter Issue in TypeORM Configuration
The error 'Cannot set property EntityManager of #<Object> which has only a getter' typically occurs when there is an attempt to assign a value to a property that is defined as a getter without a corresponding setter. This can happen if the EntityManager is being incorrectly instantiated or if the TypeORM configuration is not properly set up, leading to an attempt to overwrite a read-only property.
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- 1
Check TypeORM Configuration
Ensure that your TypeORM configuration is correctly set up and that you are not trying to overwrite the EntityManager directly. Instead, use the connection to access the EntityManager.
typescriptconst connection = await createConnection(); const entityManager = connection.manager; - 2
Review EntityManager Usage
Search your codebase for any direct assignments to EntityManager. Replace any direct assignments with proper usage of the EntityManager instance obtained from the connection.
typescript// Incorrect usage // entityManager = someValue; // Correct usage const entityManager = connection.manager; - 3
Update TypeORM Version
Ensure you are using the latest stable version of TypeORM. Sometimes bugs are fixed in newer releases, so updating might resolve the issue.
bashnpm install typeorm@latest - 4
Check for Circular Dependencies
Inspect your code for potential circular dependencies that might cause the EntityManager to be improperly initialized. Refactor your code to eliminate any circular references.
typescript// Example of a circular dependency import { User } from './User'; import { UserService } from './UserService'; - 5
Test Changes
After making the above changes, run your application to confirm that the error no longer occurs. Monitor the logs for any related errors.
bashnpm run start
Validation
Confirm that the application runs without throwing the 'Cannot set property EntityManager' error. Additionally, verify that all database operations using the EntityManager function correctly.
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Environment
Submitted by
Alex Chen
2450 rep