It's difficult for me to guess your intention. On a single hand you are expressing that each a and b are community (no primary underscore inside their names) so I ought to theoretically be permitted to access/mutate (get/established) both. But then you specify an express mutator only for a, which https://smartworlddeveloper.co.in/smart-world-69-sector-69-gurgaon-a-new-benchmark-in-urban-luxury-living/