Reuse an apollo graphql query definition for multiple vue properties - vue.js

Question

In my vue screen I'd like to use one apollo graphql I've defined for two properties. As far as I understand the name of the property must match a name of the attribute in the returned json structure.
I naivly tried to use the queries for two properties but it throws an error for the second one.
...
data() {
return {
userId: number,
user: null as User | null,
previousUserId: number,
previousUser: null as User | null
};
},
...
apollo {
user: {
query: READ_ONE_USER,
variables() {
return {
userId: this.userId
};
}
},
previousUser: {
query: READ_ONE_USER,
variables() {
return {
userId: this.previousUserId
};
},
export const READ_ONE_USER = gql(`
query user($userId: Int!) { user(userId: $userId)
{
id
firstName
lastName
email
}
}
`);
I expected no problems but I get "Missing previousUser attribute on result {user: ...}"

Answer 1

Daniel's solution didn't work out for me, I still got the same error message.
But there's another way to do it, you can provide an update function to tell apollo how to extract the result out of the data read from the server:
apollo {
user: {
query: READ_ONE_USER,
variables() {
return {
userId: this.userId
};
}
},
previousUser: {
query: READ_ONE_USER,
variables() {
return {
userId: this.previousUserId
};
},
update(data) {
return data.user;
}
}
This is documented at https://github.com/vuejs/vue-apollo/blob/v4/packages/docs/src/api/smart-query.md#options

Answer 2

As shown in the docs, you can manually add smart queries inside the created hook:
created () {
this.$apollo.addSmartQuery('user', {
query: READ_ONE_USER,
variables() {
return {
userId: this.userId
};
},
})
this.$apollo.addSmartQuery('previousUser', {
query: READ_ONE_USER,
variables() {
return {
userId: this.previousUserId
};
},
})
}