Query data across different collections in Firestore





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0















I have 2 collections: one for newspapers and another one for user registered:
enter image description here



enter image description here



At moment I'm displaying my newspapers:
enter image description here



The bookmark button (the one on the left) adds the newspaper to the user collection (as we can see on second image) but I'm not checking this when I'm getting the newspapers. How could I do this to change the button color?



This is how I get newspapers and how I save them into users collection:



getDefaultNewspapers() {
this.newspapers$ = this.likes$.pipe(
switchMap(likes =>
this.angularFirestore
.collection<NewspaperModel>("newspapers", ref =>
ref.where("likes", ">=", likes).orderBy("likes", "desc") // forget about this filter
)
// .valueChanges()
.snapshotChanges() // necessary for metadata like IDs
.map(newspapers => {
return newspapers.map(newspaper => {
const $id = newspaper.payload.doc.id;
const data = newspaper.payload.doc.data() as NewspaperModel;
return { $id, ...data };
});
})
)
);
}

addRemoveFavourite(newspaperId: string) {
this.angularFirestore
.collection("users")
.doc(this.afAuth.auth.currentUser.uid)
.update({
["myNews." + newspaperId]: {
favourite: false,
visits: 0
}
});
}









share|improve this question





























    0















    I have 2 collections: one for newspapers and another one for user registered:
    enter image description here



    enter image description here



    At moment I'm displaying my newspapers:
    enter image description here



    The bookmark button (the one on the left) adds the newspaper to the user collection (as we can see on second image) but I'm not checking this when I'm getting the newspapers. How could I do this to change the button color?



    This is how I get newspapers and how I save them into users collection:



    getDefaultNewspapers() {
    this.newspapers$ = this.likes$.pipe(
    switchMap(likes =>
    this.angularFirestore
    .collection<NewspaperModel>("newspapers", ref =>
    ref.where("likes", ">=", likes).orderBy("likes", "desc") // forget about this filter
    )
    // .valueChanges()
    .snapshotChanges() // necessary for metadata like IDs
    .map(newspapers => {
    return newspapers.map(newspaper => {
    const $id = newspaper.payload.doc.id;
    const data = newspaper.payload.doc.data() as NewspaperModel;
    return { $id, ...data };
    });
    })
    )
    );
    }

    addRemoveFavourite(newspaperId: string) {
    this.angularFirestore
    .collection("users")
    .doc(this.afAuth.auth.currentUser.uid)
    .update({
    ["myNews." + newspaperId]: {
    favourite: false,
    visits: 0
    }
    });
    }









    share|improve this question

























      0












      0








      0








      I have 2 collections: one for newspapers and another one for user registered:
      enter image description here



      enter image description here



      At moment I'm displaying my newspapers:
      enter image description here



      The bookmark button (the one on the left) adds the newspaper to the user collection (as we can see on second image) but I'm not checking this when I'm getting the newspapers. How could I do this to change the button color?



      This is how I get newspapers and how I save them into users collection:



      getDefaultNewspapers() {
      this.newspapers$ = this.likes$.pipe(
      switchMap(likes =>
      this.angularFirestore
      .collection<NewspaperModel>("newspapers", ref =>
      ref.where("likes", ">=", likes).orderBy("likes", "desc") // forget about this filter
      )
      // .valueChanges()
      .snapshotChanges() // necessary for metadata like IDs
      .map(newspapers => {
      return newspapers.map(newspaper => {
      const $id = newspaper.payload.doc.id;
      const data = newspaper.payload.doc.data() as NewspaperModel;
      return { $id, ...data };
      });
      })
      )
      );
      }

      addRemoveFavourite(newspaperId: string) {
      this.angularFirestore
      .collection("users")
      .doc(this.afAuth.auth.currentUser.uid)
      .update({
      ["myNews." + newspaperId]: {
      favourite: false,
      visits: 0
      }
      });
      }









      share|improve this question














      I have 2 collections: one for newspapers and another one for user registered:
      enter image description here



      enter image description here



      At moment I'm displaying my newspapers:
      enter image description here



      The bookmark button (the one on the left) adds the newspaper to the user collection (as we can see on second image) but I'm not checking this when I'm getting the newspapers. How could I do this to change the button color?



      This is how I get newspapers and how I save them into users collection:



      getDefaultNewspapers() {
      this.newspapers$ = this.likes$.pipe(
      switchMap(likes =>
      this.angularFirestore
      .collection<NewspaperModel>("newspapers", ref =>
      ref.where("likes", ">=", likes).orderBy("likes", "desc") // forget about this filter
      )
      // .valueChanges()
      .snapshotChanges() // necessary for metadata like IDs
      .map(newspapers => {
      return newspapers.map(newspaper => {
      const $id = newspaper.payload.doc.id;
      const data = newspaper.payload.doc.data() as NewspaperModel;
      return { $id, ...data };
      });
      })
      )
      );
      }

      addRemoveFavourite(newspaperId: string) {
      this.angularFirestore
      .collection("users")
      .doc(this.afAuth.auth.currentUser.uid)
      .update({
      ["myNews." + newspaperId]: {
      favourite: false,
      visits: 0
      }
      });
      }






      firebase google-cloud-firestore






      share|improve this question













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      share|improve this question










      asked Nov 23 '18 at 18:40









      Daniel RodriguezDaniel Rodriguez

      465418




      465418
























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