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Firebasecloud~10 mins

Migrating from Realtime Database to Firestore in Firebase - Step-by-Step Execution

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Process Flow - Migrating from Realtime Database to Firestore
Start: Existing Realtime Database
Export Data from Realtime Database
Transform Data Format
Import Data into Firestore
Update App Code to Use Firestore SDK
Test and Verify Data Integrity
Switch App to Firestore Fully
End
This flow shows the main steps to move data and app logic from Realtime Database to Firestore.
Execution Sample
Firebase
1. Export data from Realtime Database
2. Convert JSON structure to Firestore format
3. Import data into Firestore
4. Update app code to Firestore SDK
5. Test app with Firestore
Step-by-step process to migrate data and update app code from Realtime Database to Firestore.
Process Table
StepActionInput/StateOutput/State Change
1Export dataRealtime Database with nested JSONJSON file with exported data
2Transform dataExported JSONData formatted for Firestore collections and documents
3Import dataFormatted dataData loaded into Firestore with collections and documents
4Update app codeApp using Realtime Database SDKApp uses Firestore SDK calls
5Test appApp connected to FirestoreVerified data integrity and app functionality
6Switch app fullyApp ready with FirestoreApp runs fully on Firestore, Realtime Database deprecated
💡 Migration complete when app fully uses Firestore and data is verified.
Status Tracker
VariableStartAfter Step 1After Step 2After Step 3After Step 4Final
Data FormatRealtime DB JSONExported JSON fileFirestore JSON formatFirestore collections/documentsApp code with Firestore SDKApp running on Firestore
Key Moments - 3 Insights
Why do we need to transform the data format after exporting from Realtime Database?
Because Realtime Database uses a nested JSON tree, but Firestore uses collections and documents, so the data structure must be changed to fit Firestore's model (see execution_table step 2).
What happens if the app code is not updated to use Firestore SDK after importing data?
The app will still try to access Realtime Database and fail to read the new Firestore data, causing errors (see execution_table step 4).
How do we know the migration is successful?
When the app runs fully on Firestore, data is correct, and no errors occur during testing (see execution_table step 5 and 6).
Visual Quiz - 3 Questions
Test your understanding
Look at the execution_table, what is the output after Step 3?
AApp code updated to Firestore SDK
BExported JSON file
CData loaded into Firestore with collections and documents
DVerified data integrity
💡 Hint
Check the 'Output/State Change' column for Step 3 in execution_table
At which step does the app code switch to using Firestore SDK?
AStep 2
BStep 4
CStep 5
DStep 6
💡 Hint
Look at the 'Action' column in execution_table for when app code is updated
If the data is not transformed properly, what will likely happen?
AData import into Firestore will fail or be incorrect
BRealtime Database will auto-convert data
CApp will run faster
DNo effect on migration
💡 Hint
Refer to key_moments about data format transformation and execution_table step 2
Concept Snapshot
Migrating from Realtime Database to Firestore:
1. Export data from Realtime Database as JSON.
2. Transform data to Firestore's collections/documents format.
3. Import transformed data into Firestore.
4. Update app code to use Firestore SDK.
5. Test app and switch fully to Firestore.
Full Transcript
To migrate from Realtime Database to Firestore, first export your data as JSON. Then, transform this data to fit Firestore's collections and documents structure. Next, import the transformed data into Firestore. Update your app code to use Firestore SDK instead of Realtime Database SDK. Finally, test your app to ensure data integrity and switch fully to Firestore once verified.