- 1 year ago
Getting 'specififed module cannot be found' when requiring pg from Ruby 3.0
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If you are encountering the error "The specified module could not be found" when requiring the pg
gem in Ruby 3.0, it is likely due to a missing or incompatible PostgreSQL library.
To resolve this issue, you can try the following steps:
Install PostgreSQL:
- Make sure you have PostgreSQL installed on your system.
- Visit the official PostgreSQL website (https://www.postgresql.org/) and download the appropriate version for your operating system.
- Run the installer and follow the installation instructions.
Verify PostgreSQL Binaries:
- Check that the PostgreSQL binaries are in the system's PATH environment variable.
- Open a command prompt or terminal and run the following command to verify if
pg_config
is accessible:shellpg_config
- If the command is not recognized, you may need to manually add the PostgreSQL binaries directory to the PATH.
Reinstall the
pg
gem:- Uninstall the existing
pg
gem:shellgem uninstall pg
- Reinstall the
pg
gem, ensuring that the--with-pg-config
option points to the correctpg_config
binary:shellgem install pg -- --with-pg-config=/path/to/pg_config
- Replace
/path/to/pg_config
with the actual path to thepg_config
binary. It is typically located in the PostgreSQL installation directory.
- Uninstall the existing
By ensuring that PostgreSQL is installed, the PostgreSQL binaries are accessible, and the pg
gem is correctly installed with the appropriate pg_config
binary, you should be able to resolve the "The specified module could not be found" error when requiring pg
in Ruby 3.0.