schema-changes.md

What happens when a user changes their schema?

• The schema.js file that exists within an Amplify project (located at src/models/schema.js) contains a version hash.
• This hash is compared against the hash stored in the Settings table of the local database. Example:

      {
          id: "01FYABF3DMBZZJ46W1CC214NH2"
          key: "schemaVersion"
          value: "\"4401034582a70c60713e1f7f9da3b752\""
      }
  

• The process of checking the schema version (checkSchemaVersion) occurs when DataStore starts, after the Storage Engine has been initialized, and before the Sync Engine is initialized.
• If the schema version has changed, we clear local storage, and perform a full sync