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https://book.cakephp.org/5/en/orm/associations.html#hasone-associations
For beginners it can probably be confusing to see only hasOne() relations in singular, and only sometimes.
If anything, I would have expected belongsTo() to be singular, since there can always be only one ever.
HasOne() could easily become hasMany() by allowing more rows to be allowed, and then requires more massive refactoring.
So from the convention approach, it seems sound to stick here to the default, plural.
What do others think?