fix https://github.com/AppFlowy-IO/appflowy/issues/196

backend/src/services/core/view/controller.rs

@@ -10,7 +10,7 @@ use backend_service::errors::{invalid_params, ServerError};
 use bytes::Bytes;
 use chrono::Utc;
 use flowy_collaboration::{
-    entities::revision::{RepeatedRevision, RevType, Revision},
+    entities::revision::{RepeatedRevision, Revision},
     protobuf::CreateDocParams,
 };
 use flowy_core_data_model::{

backend/tests/api_test/workspace_test.rs

@@ -5,7 +5,7 @@ use flowy_collaboration::{
     document::{Document, PlainDoc},
     entities::{
         doc::{CreateDocParams, DocumentId},
-        revision::{md5, RepeatedRevision, RevType, Revision},
+        revision::{md5, RepeatedRevision, Revision},
     },
 };
 use flowy_core_data_model::entities::{

frontend/app_flowy/packages/flowy_sdk/lib/dispatch/dispatch.dart

@@ -3,6 +3,7 @@ import 'package:dartz/dartz.dart';
 import 'package:flowy_log/flowy_log.dart';
 // ignore: unnecessary_import
 import 'package:flowy_sdk/protobuf/dart-ffi/ffi_response.pb.dart';
+import 'package:flowy_sdk/protobuf/dart-ffi/ffi_request.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-error/errors.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-net/event.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-net/network_state.pb.dart';

frontend/rust-lib/flowy-document/src/services/doc/edit/editor.rs

@@ -9,7 +9,7 @@ use crate::{
 use bytes::Bytes;
 use flowy_collaboration::{
     document::history::UndoResult,
-    entities::revision::{RevId, RevType, Revision},
+    entities::revision::{RevId, Revision},
     errors::CollaborateResult,
 };
 use flowy_database::ConnectionPool;

frontend/rust-lib/flowy-document/src/services/doc/revision/cache/cache.rs

@@ -6,20 +6,16 @@ use crate::{
     },
     sql_tables::{RevisionChangeset, RevisionTableState},
 };
-use dashmap::DashMap;
+
 use flowy_collaboration::entities::revision::{Revision, RevisionRange, RevisionState};
 use flowy_database::ConnectionPool;
 use flowy_error::{internal_error, FlowyResult};
-use lib_infra::future::FutureResult;
-use lib_ot::errors::OTError;
-use std::{
-    collections::VecDeque,
-    sync::{
-        atomic::{AtomicI64, Ordering::SeqCst},
-        Arc,
-    },
+
+use std::sync::{
+    atomic::{AtomicI64, Ordering::SeqCst},
+    Arc,
 };
-use tokio::{sync::RwLock, task::spawn_blocking};
+use tokio::task::spawn_blocking;
 
 pub struct RevisionCache {
     doc_id: String,
@@ -41,12 +37,21 @@ impl RevisionCache {
         }
     }
 
-    pub async fn add(&self, revision: Revision, state: RevisionState) -> FlowyResult<RevisionRecord> {
+    pub async fn add(
+        &self,
+        revision: Revision,
+        state: RevisionState,
+        write_to_disk: bool,
+    ) -> FlowyResult<RevisionRecord> {
         if self.memory_cache.contains(&revision.rev_id) {
             return Err(FlowyError::internal().context(format!("Duplicate remote revision id: {}", revision.rev_id)));
         }
         let rev_id = revision.rev_id;
-        let record = RevisionRecord { revision, state };
+        let record = RevisionRecord {
+            revision,
+            state,
+            write_to_disk,
+        };
         self.memory_cache.add(&record).await;
         self.set_latest_rev_id(rev_id);
         Ok(record)
@@ -111,6 +116,7 @@ impl RevisionCache {
             .map(|revision| RevisionRecord {
                 revision,
                 state: RevisionState::Local,
+                write_to_disk: true,
             })
             .collect::<Vec<_>>();
 
@@ -128,9 +134,13 @@ impl RevisionCache {
 }
 
 impl RevisionMemoryCacheDelegate for Arc<Persistence> {
-    fn checkpoint_tick(&self, records: Vec<RevisionRecord>) -> FlowyResult<()> {
+    fn checkpoint_tick(&self, mut records: Vec<RevisionRecord>) -> FlowyResult<()> {
         let conn = &*self.pool.get().map_err(internal_error)?;
-        self.write_revision_records(records, &conn)
+        records.retain(|record| record.write_to_disk);
+        if !records.is_empty() {
+            let _ = self.write_revision_records(records, &conn)?;
+        }
+        Ok(())
     }
 
     fn receive_ack(&self, doc_id: &str, rev_id: i64) {
@@ -150,6 +160,7 @@ impl RevisionMemoryCacheDelegate for Arc<Persistence> {
 pub struct RevisionRecord {
     pub revision: Revision,
     pub state: RevisionState,
+    pub write_to_disk: bool,
 }
 
 impl RevisionRecord {

frontend/rust-lib/flowy-document/src/services/doc/revision/manager.rs

@@ -7,7 +7,7 @@ use dashmap::DashMap;
 use flowy_collaboration::{
     entities::{
         doc::DocumentInfo,
-        revision::{RepeatedRevision, RevType, Revision, RevisionRange, RevisionState},
+        revision::{RepeatedRevision, Revision, RevisionRange, RevisionState},
     },
     util::{md5, RevIdCounter},
 };
@@ -68,13 +68,13 @@ impl RevisionManager {
     #[tracing::instrument(level = "debug", skip(self, revision))]
     pub async fn add_remote_revision(&self, revision: &Revision) -> Result<(), FlowyError> {
         self.rev_id_counter.set(revision.rev_id);
-        let _ = self.cache.add(revision.clone(), RevisionState::Ack).await?;
+        let _ = self.cache.add(revision.clone(), RevisionState::Ack, true).await?;
         Ok(())
     }
 
     #[tracing::instrument(level = "debug", skip(self, revision))]
     pub async fn add_local_revision(&self, revision: &Revision) -> Result<(), FlowyError> {
-        let record = self.cache.add(revision.clone(), RevisionState::Local).await?;
+        let record = self.cache.add(revision.clone(), RevisionState::Local, true).await?;
         self.sync_seq.add_revision(record).await?;
         Ok(())
     }
@@ -206,14 +206,18 @@ impl RevisionLoader {
                 &self.user_id,
                 doc_md5,
             );
-            let _ = self.cache.add(revision.clone(), RevisionState::Ack).await?;
+            let _ = self.cache.add(revision.clone(), RevisionState::Ack, true).await?;
             revisions = vec![revision];
         } else {
             for record in &records {
                 match record.state {
                     RevisionState::Local => {
                         //
-                        match self.cache.add(record.revision.clone(), RevisionState::Local).await {
+                        match self
+                            .cache
+                            .add(record.revision.clone(), RevisionState::Local, false)
+                            .await
+                        {
                             Ok(_) => {},
                             Err(e) => tracing::error!("{}", e),
                         }

frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs

@@ -10,7 +10,7 @@ use crate::services::doc::{
 use bytes::Bytes;
 use flowy_collaboration::{
     entities::{
-        revision::{RepeatedRevision, RevType, Revision, RevisionRange},
+        revision::{RepeatedRevision, Revision, RevisionRange},
         ws::{DocumentClientWSData, NewDocumentUser},
     },
     errors::CollaborateResult,

frontend/rust-lib/flowy-document/src/sql_tables/doc/rev_table.rs

@@ -80,6 +80,7 @@ pub(crate) fn mk_revision_record_from_table(user_id: &str, table: RevisionTable)
     RevisionRecord {
         revision,
         state: table.state.into(),
+        write_to_disk: false,
     }
 }
 

shared-lib/flowy-core-data-model/src/entities/view/view_create.rs

@@ -98,7 +98,7 @@ impl CreateViewParams {
         }
     }
 
-    pub fn take_view_data(&mut self) -> String { ::std::mem::replace(&mut self.view_data, String::new()) }
+    pub fn take_view_data(&mut self) -> String { std::mem::take(&mut self.view_data) }
 }
 
 impl TryInto<CreateViewParams> for CreateViewRequest {