javascript - Update $key of Firebase object using AngularFire2 -


i trying update $key of object firebase database. values in object want keep untouched. tried way: 

this.af.object('personalmessages/'+ firebase_uid).update({ $key: 'my custom key' })

i no error, record not updating.

the big objects looks this:

personalmessages:{      the_key_i_want_to_update:     {          isread:  false          text: "some text goes here"          timestamp:   1502448955231.222      } }


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