Change values of one firestore collection with data of a second one












0














I am a bit confused, I am trying to build 1 response by querying one collection, and trying to change some values of the first observable with values of a related query.



i.e.

1. On the first collection I have the system categories with 'position' that is the default value:

Categories = [{name:'cat1', id:'id', position:1},...]

2. on the second one I have the user values /user_id/categories

UserCategories = [{cat_id:1, position:3},...]



Now I need to change the position value, based on the user, so I have this on my service:



  getCategoriesAfsOld() {
this.categoriesCollection = this.afs.collection('category');
return this.categoriesCollection
.snapshotChanges()
.map(category => {
return category.map(data => {
const catData = data.payload.doc.data() as Category;
const usrData = this.afs.doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
.valueChanges();
usrData.subscribe( (catByUsr: CatByUser) =>{
if(typeof catByUsr !== "undefined"){
catData.position = catByUsr.position;
}
}
);
catData.id = data.payload.doc.id;
return catData;
});
});
}


Now, this almost does the trick, but because I am using map(), it returns the the data unchanged and after a short time it sends the data changed again with the new positions.

As you might guess this is not good, I need to send the data modified on the first call,and probably stop the stream. I know this can be accomplished by using switchMap, I have not being able to do this.



I am doing something really wrong or maybe looking in the wrong direction.



Please some help or guidance.



The following is one of many failed tries:



  getCategoriesAfs() {
this.categoriesCollection = this.afs.collection('category');
return this.categoriesCollection
.snapshotChanges()
.switchMap(category => {
return category.map(data => {
const catData = data.payload.doc.data() as Category;
catData.id = data.payload.doc.id;
const usrData = this.afs
.doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
.valueChanges().switchMap(((value) => {
const data = ;
return data;
}));
usrData.subscribe( (catByUsr) =>{
if(typeof catByUsr !== "undefined"){
catData.position = catByUsr.position;
}
}
);
return catData;
});
});
}









share|improve this question





























    0














    I am a bit confused, I am trying to build 1 response by querying one collection, and trying to change some values of the first observable with values of a related query.



    i.e.

    1. On the first collection I have the system categories with 'position' that is the default value:

    Categories = [{name:'cat1', id:'id', position:1},...]

    2. on the second one I have the user values /user_id/categories

    UserCategories = [{cat_id:1, position:3},...]



    Now I need to change the position value, based on the user, so I have this on my service:



      getCategoriesAfsOld() {
    this.categoriesCollection = this.afs.collection('category');
    return this.categoriesCollection
    .snapshotChanges()
    .map(category => {
    return category.map(data => {
    const catData = data.payload.doc.data() as Category;
    const usrData = this.afs.doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
    .valueChanges();
    usrData.subscribe( (catByUsr: CatByUser) =>{
    if(typeof catByUsr !== "undefined"){
    catData.position = catByUsr.position;
    }
    }
    );
    catData.id = data.payload.doc.id;
    return catData;
    });
    });
    }


    Now, this almost does the trick, but because I am using map(), it returns the the data unchanged and after a short time it sends the data changed again with the new positions.

    As you might guess this is not good, I need to send the data modified on the first call,and probably stop the stream. I know this can be accomplished by using switchMap, I have not being able to do this.



    I am doing something really wrong or maybe looking in the wrong direction.



    Please some help or guidance.



    The following is one of many failed tries:



      getCategoriesAfs() {
    this.categoriesCollection = this.afs.collection('category');
    return this.categoriesCollection
    .snapshotChanges()
    .switchMap(category => {
    return category.map(data => {
    const catData = data.payload.doc.data() as Category;
    catData.id = data.payload.doc.id;
    const usrData = this.afs
    .doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
    .valueChanges().switchMap(((value) => {
    const data = ;
    return data;
    }));
    usrData.subscribe( (catByUsr) =>{
    if(typeof catByUsr !== "undefined"){
    catData.position = catByUsr.position;
    }
    }
    );
    return catData;
    });
    });
    }









    share|improve this question



























      0












      0








      0







      I am a bit confused, I am trying to build 1 response by querying one collection, and trying to change some values of the first observable with values of a related query.



      i.e.

      1. On the first collection I have the system categories with 'position' that is the default value:

      Categories = [{name:'cat1', id:'id', position:1},...]

      2. on the second one I have the user values /user_id/categories

      UserCategories = [{cat_id:1, position:3},...]



      Now I need to change the position value, based on the user, so I have this on my service:



        getCategoriesAfsOld() {
      this.categoriesCollection = this.afs.collection('category');
      return this.categoriesCollection
      .snapshotChanges()
      .map(category => {
      return category.map(data => {
      const catData = data.payload.doc.data() as Category;
      const usrData = this.afs.doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
      .valueChanges();
      usrData.subscribe( (catByUsr: CatByUser) =>{
      if(typeof catByUsr !== "undefined"){
      catData.position = catByUsr.position;
      }
      }
      );
      catData.id = data.payload.doc.id;
      return catData;
      });
      });
      }


      Now, this almost does the trick, but because I am using map(), it returns the the data unchanged and after a short time it sends the data changed again with the new positions.

      As you might guess this is not good, I need to send the data modified on the first call,and probably stop the stream. I know this can be accomplished by using switchMap, I have not being able to do this.



      I am doing something really wrong or maybe looking in the wrong direction.



      Please some help or guidance.



      The following is one of many failed tries:



        getCategoriesAfs() {
      this.categoriesCollection = this.afs.collection('category');
      return this.categoriesCollection
      .snapshotChanges()
      .switchMap(category => {
      return category.map(data => {
      const catData = data.payload.doc.data() as Category;
      catData.id = data.payload.doc.id;
      const usrData = this.afs
      .doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
      .valueChanges().switchMap(((value) => {
      const data = ;
      return data;
      }));
      usrData.subscribe( (catByUsr) =>{
      if(typeof catByUsr !== "undefined"){
      catData.position = catByUsr.position;
      }
      }
      );
      return catData;
      });
      });
      }









      share|improve this question















      I am a bit confused, I am trying to build 1 response by querying one collection, and trying to change some values of the first observable with values of a related query.



      i.e.

      1. On the first collection I have the system categories with 'position' that is the default value:

      Categories = [{name:'cat1', id:'id', position:1},...]

      2. on the second one I have the user values /user_id/categories

      UserCategories = [{cat_id:1, position:3},...]



      Now I need to change the position value, based on the user, so I have this on my service:



        getCategoriesAfsOld() {
      this.categoriesCollection = this.afs.collection('category');
      return this.categoriesCollection
      .snapshotChanges()
      .map(category => {
      return category.map(data => {
      const catData = data.payload.doc.data() as Category;
      const usrData = this.afs.doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
      .valueChanges();
      usrData.subscribe( (catByUsr: CatByUser) =>{
      if(typeof catByUsr !== "undefined"){
      catData.position = catByUsr.position;
      }
      }
      );
      catData.id = data.payload.doc.id;
      return catData;
      });
      });
      }


      Now, this almost does the trick, but because I am using map(), it returns the the data unchanged and after a short time it sends the data changed again with the new positions.

      As you might guess this is not good, I need to send the data modified on the first call,and probably stop the stream. I know this can be accomplished by using switchMap, I have not being able to do this.



      I am doing something really wrong or maybe looking in the wrong direction.



      Please some help or guidance.



      The following is one of many failed tries:



        getCategoriesAfs() {
      this.categoriesCollection = this.afs.collection('category');
      return this.categoriesCollection
      .snapshotChanges()
      .switchMap(category => {
      return category.map(data => {
      const catData = data.payload.doc.data() as Category;
      catData.id = data.payload.doc.id;
      const usrData = this.afs
      .doc(`/user/${this.auth.getUserID()}/category/${data.payload.doc.id}`)
      .valueChanges().switchMap(((value) => {
      const data = ;
      return data;
      }));
      usrData.subscribe( (catByUsr) =>{
      if(typeof catByUsr !== "undefined"){
      catData.position = catByUsr.position;
      }
      }
      );
      return catData;
      });
      });
      }






      javascript firebase google-cloud-firestore angularfire2






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      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 12 '18 at 19:29









      Frank van Puffelen

      227k28373396




      227k28373396










      asked Nov 12 '18 at 19:23









      moplin

      1,382922




      1,382922
























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