Firestore Getting documents id from collection

Question

I m trying to retrieve my documents with id but can t figure it out  Currently I retrieve my documents like this     const racesCollection  AngularFirestoreCollection lt Races gt    this afs collection  races    return racesCollection valueChanges      I do get my documents list perfectly  however there is no doc id with them   How can I retrieve it for each document

User · Answer

Can get ID before add documents in database   var idBefore    this afs createId    console log idBefore

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For document references  not collections  you need      when you know the  id   this afs doc  items   id       snapshotChanges   pipe      map  doc  any    gt          const data   doc payload data          const id   doc payload id        return   id     data              as  valueChanges   idField   id     will not work here   I assume it was not implemented since generally you search for a document by the id

User · Answer

To obtain the id of the documents in a collection  you must use snapshotChanges       this shirtCollection   afs collection lt Shirt gt   shirts            snapshotChanges   returns a DocumentChangeAction    which contains        a lot of information about  quot what happened quot  with each change  If you want to        get the data and the id use the map operator      this shirts   this shirtCollection snapshotChanges   map actions   gt          return actions map a   gt            const data   a payload doc data   as Shirt          const id   a payload doc id          return   id     data                       Documentation https   github com angular angularfire2 blob 7eb3e51022c7381dfc94ffb9e12555065f060639 docs firestore collections md example

User · Answer

I ve finally found the solution  Victor was close with the doc data   const racesCollection  AngularFirestoreCollection lt Race gt   return racesCollection snapshotChanges   map actions   gt             return actions map a   gt        const data   a payload doc data   as Race      data id   a payload doc id      return data              ValueChanges   doesn t include metadata  therefor we must use SnapshotChanges   when we require the document id and then map it properly as stated here https   github com angular angularfire2 blob master docs firestore collections md

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For angular6      this shirtCollection   afs collection lt Shirt gt   shirts        this shirts   this shirtCollection snapshotChanges   pipe          map actions   gt            return actions map a   gt                const data   a payload doc data   as Shirt              const id   a payload doc id              return   id     data

User · Answer

doc id gets the UID   Combine with the rest of the data for one object like so   Object assign   uid  doc id    doc data

User · Answer

Since you are using angularFire  it doesn t make any sense if you are going back to default firebase methods for your implementation   AngularFire itself has the proper mechanisms implemented  Just have to use it   valueChanges   method of angularFire provides an overload for getting the ID of each document of the collection by simply adding a object as a parameter to the method   valueChanges   idField   id       Here  idField  must be same as it is   id  can be anything that you want your document IDs to be called   Then the each document object on the returned array will look like this       field1    lt field1 value gt     field2    lt field2 value gt          id    whatEverTheDocumentIdWas      Then you can easily get the document ID by referencing to the field that you named   AngularFire 5 2 0

User · Answer

For angular 8 and Firebase 6 you can use the option id field         getAllDocs                const ref   this db collection  items               return ref valueChanges  idField   customIdName               this adds the Id of the document on the object with a specified key  customIdName

User · Answer

I have tried this       return this db collection  items   snapshotChanges   pipe            map actions   gt                       return actions map a   gt                  const data   a payload doc data   as Item                data id   a payload doc id                data  key   a payload doc id                return data

[angular] Firestore Getting documents id from collection

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