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If you want to read data, then you need to use once()
:
actions: {
fetchUserProfile({ commit, state }) {
fb.db.ref(`users/${state.currentUser.uid}`).once('value').then(res => {
commit('setUserProfile', res.val())
}).catch(err => {
console.log(err)
})
}
},
check here for more info:
https://firebase.google.com/docs/database/web/read-and-write#read_data_once
Source:stackexchange.com