fn is not a function

[TitusKirch]

Hey,
after installing and copying the example I get the error message:

error: Migration v1_init_user_titles.js (up) failed: Original error: fn is not a function

Anyone have an idea what this could be due to or is this a problem in the plugin?

Best regards
Titus

[jmleroux]

Hello,
I have the same error on a fresh Strapi 4.3.8 install.

[AndreasMaros]

I encountered the same problem, and I have a hunch:

So apparently Strapi has its own migration suite built-in, using the library umzug, which attempts to read database migrations from a subdirectory migrations in the SQLite database's directory.

umzug expects a different format for migrations: It requires an object containing up() and down() methods.

// umzug migration format
module.exports = {
  asnyc up() {
    // do things
  },
  async down() {
    // undo things
  },
};

---

This means that in order to use this plugin, you will need to move your migrations and the the configured migrations directory to a different location, where they will not be read by umzug.

---

The questions, however, that pose themselves are (and maybe @TonyDeplanque can help in answering them):

• Is the built-in database migration system in Strapi meant for "internal" use only, or why is it not documented can I not find any documentation?
• If it's just that the documentation is missing or buried (as seems to be widespread at Strapi): What added benefits does using this plugin have over using the inbuilt system?