diff --git a/src/cache/backends/persistent_backend.rs b/src/cache/backends/persistent_backend.rs
index b538aa5..feff0fb 100644
--- a/src/cache/backends/persistent_backend.rs
+++ b/src/cache/backends/persistent_backend.rs
@@ -188,7 +188,7 @@ impl FirestorePersistentCacheBackend {
     fn write_document(&self, doc: &Document) -> FirestoreResult<()> {
         let (collection_path, document_id) = split_document_path(&doc.name);
 
-        if self.config.collections.get(collection_path).is_some() {
+        if self.config.collections.contains_key(collection_path) {
             let td: TableDefinition<&str, &[u8]> = TableDefinition::new(collection_path);
 
             let write_txn = self.redb.begin_write()?;
@@ -338,7 +338,7 @@ impl FirestoreCacheDocsByPathSupport for FirestorePersistentCacheBackend {
         document_path: &str,
     ) -> FirestoreResult<Option<FirestoreDocument>> {
         let (collection_path, document_id) = split_document_path(document_path);
-        if self.config.collections.get(collection_path).is_some() {
+        if self.config.collections.contains_key(collection_path) {
             let td: TableDefinition<&str, &[u8]> = TableDefinition::new(collection_path);
             let read_tx = self.redb.begin_read()?;
             let table = read_tx.open_table(td)?;
@@ -359,7 +359,7 @@ impl FirestoreCacheDocsByPathSupport for FirestorePersistentCacheBackend {
         collection_path: &str,
     ) -> FirestoreResult<FirestoreCachedValue<BoxStream<'b, FirestoreResult<FirestoreDocument>>>>
     {
-        if self.config.collections.get(collection_path).is_some() {
+        if self.config.collections.contains_key(collection_path) {
             let td: TableDefinition<&str, &[u8]> = TableDefinition::new(collection_path);
 
             let read_tx = self.redb.begin_read()?;
@@ -388,7 +388,7 @@ impl FirestoreCacheDocsByPathSupport for FirestorePersistentCacheBackend {
         query: &FirestoreQueryParams,
     ) -> FirestoreResult<FirestoreCachedValue<BoxStream<'b, FirestoreResult<FirestoreDocument>>>>
     {
-        if self.config.collections.get(collection_path).is_some() {
+        if self.config.collections.contains_key(collection_path) {
             // For now only basic/simple query all supported
             let simple_query_engine = FirestoreCacheQueryEngine::new(query);
             if simple_query_engine.params_supported() {
diff --git a/src/db/query_models.rs b/src/db/query_models.rs
index 943ac31..8fcf659 100644
--- a/src/db/query_models.rs
+++ b/src/db/query_models.rs
@@ -13,6 +13,7 @@ pub enum FirestoreQueryCollection {
     Group(Vec<String>),
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for FirestoreQueryCollection {
     fn to_string(&self) -> String {
         match self {
@@ -312,6 +313,7 @@ pub enum FirestoreQueryDirection {
     Descending,
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for FirestoreQueryDirection {
     fn to_string(&self) -> String {
         match self {
diff --git a/src/errors.rs b/src/errors.rs
index 8fa3e11..ae5df32 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -252,6 +252,15 @@ fn check_hyper_errors(status: gcloud_sdk::tonic::Status) -> FirestoreError {
                 format!("Hyper error: {err}"),
                 false,
             )),
+            _ if status.code() == gcloud_sdk::tonic::Code::Unknown
+                && status.message().contains("transport error") =>
+            {
+                FirestoreError::DatabaseError(FirestoreDatabaseError::new(
+                    FirestoreErrorPublicGenericDetails::new("CONNECTION_ERROR".into()),
+                    format!("{status}"),
+                    true,
+                ))
+            }
             _ => FirestoreError::DatabaseError(FirestoreDatabaseError::new(
                 FirestoreErrorPublicGenericDetails::new(format!("{:?}", status.code())),
                 format!("{status}"),
@@ -260,7 +269,7 @@ fn check_hyper_errors(status: gcloud_sdk::tonic::Status) -> FirestoreError {
         },
         _ => FirestoreError::DatabaseError(FirestoreDatabaseError::new(
             FirestoreErrorPublicGenericDetails::new(format!("{:?}", status.code())),
-            format!("{status}"),
+            format!("{status} without root cause"),
             false,
         )),
     }
diff --git a/src/firestore_serde/latlng_serializers.rs b/src/firestore_serde/latlng_serializers.rs
index d311dd7..69ca31d 100644
--- a/src/firestore_serde/latlng_serializers.rs
+++ b/src/firestore_serde/latlng_serializers.rs
@@ -30,14 +30,11 @@ pub fn serialize_latlng_for_firestore<T: ?Sized + Serialize>(
         type Ok = FirestoreValue;
         type Error = FirestoreError;
 
-        fn serialize_field<T: ?Sized>(
+        fn serialize_field<T: ?Sized + Serialize>(
             &mut self,
             key: &'static str,
             value: &T,
-        ) -> Result<(), Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<(), Self::Error> {
             let serializer = FirestoreValueSerializer {
                 none_as_null: false,
             };
@@ -63,7 +60,7 @@ pub fn serialize_latlng_for_firestore<T: ?Sized + Serialize>(
                         FirestoreSerializationError::from_message(
                             "LatLng serializer doesn't recognize the structure of the object",
                         ),
-                    ))
+                    ));
                 }
             };
 
@@ -209,10 +206,7 @@ pub fn serialize_latlng_for_firestore<T: ?Sized + Serialize>(
             ))
         }
 
-        fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        fn serialize_some<T: ?Sized + Serialize>(self, value: &T) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
@@ -235,27 +229,21 @@ pub fn serialize_latlng_for_firestore<T: ?Sized + Serialize>(
             self.serialize_str(variant)
         }
 
-        fn serialize_newtype_struct<T: ?Sized>(
+        fn serialize_newtype_struct<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
-        fn serialize_newtype_variant<T: ?Sized>(
+        fn serialize_newtype_variant<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             _variant_index: u32,
             _variant: &'static str,
             _value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             Err(FirestoreError::SerializeError(
                 FirestoreSerializationError::from_message(
                     "LatLng serializer doesn't support this type",
diff --git a/src/firestore_serde/reference_serializers.rs b/src/firestore_serde/reference_serializers.rs
index 0a9a8a1..dfae40b 100644
--- a/src/firestore_serde/reference_serializers.rs
+++ b/src/firestore_serde/reference_serializers.rs
@@ -207,10 +207,7 @@ pub fn serialize_reference_for_firestore<T: ?Sized + Serialize>(
             }
         }
 
-        fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        fn serialize_some<T: ?Sized + Serialize>(self, value: &T) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
@@ -233,27 +230,21 @@ pub fn serialize_reference_for_firestore<T: ?Sized + Serialize>(
             self.serialize_str(variant)
         }
 
-        fn serialize_newtype_struct<T: ?Sized>(
+        fn serialize_newtype_struct<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
-        fn serialize_newtype_variant<T: ?Sized>(
+        fn serialize_newtype_variant<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             _variant_index: u32,
             _variant: &'static str,
             _value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             Err(FirestoreError::SerializeError(
                 FirestoreSerializationError::from_message(
                     "Reference serializer doesn't support this type",
diff --git a/src/firestore_serde/serializer.rs b/src/firestore_serde/serializer.rs
index fd20841..18714cf 100644
--- a/src/firestore_serde/serializer.rs
+++ b/src/firestore_serde/serializer.rs
@@ -176,10 +176,7 @@ impl serde::Serializer for FirestoreValueSerializer {
         }
     }
 
-    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_some<T: ?Sized + Serialize>(self, value: &T) -> Result<Self::Ok, Self::Error> {
         value.serialize(self)
     }
 
@@ -202,14 +199,11 @@ impl serde::Serializer for FirestoreValueSerializer {
         self.serialize_str(variant)
     }
 
-    fn serialize_newtype_struct<T: ?Sized>(
+    fn serialize_newtype_struct<T: ?Sized + Serialize>(
         self,
         name: &'static str,
         value: &T,
-    ) -> Result<Self::Ok, Self::Error>
-    where
-        T: Serialize,
-    {
+    ) -> Result<Self::Ok, Self::Error> {
         match name {
             crate::firestore_serde::timestamp_serializers::FIRESTORE_TS_TYPE_TAG_TYPE => {
                 crate::firestore_serde::timestamp_serializers::serialize_timestamp_for_firestore(
@@ -241,16 +235,13 @@ impl serde::Serializer for FirestoreValueSerializer {
         }
     }
 
-    fn serialize_newtype_variant<T: ?Sized>(
+    fn serialize_newtype_variant<T: ?Sized + Serialize>(
         self,
         _name: &'static str,
         _variant_index: u32,
         variant: &'static str,
         value: &T,
-    ) -> Result<Self::Ok, Self::Error>
-    where
-        T: Serialize,
-    {
+    ) -> Result<Self::Ok, Self::Error> {
         let mut fields = HashMap::new();
         fields.insert(String::from(variant), value.serialize(self)?.value);
         Ok(FirestoreValue::from(
@@ -330,10 +321,7 @@ impl serde::ser::SerializeSeq for SerializeVec {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_element<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), Self::Error> {
         let serialized_value = value
             .serialize(FirestoreValueSerializer {
                 none_as_null: self.none_as_null,
@@ -360,10 +348,7 @@ impl serde::ser::SerializeTuple for SerializeVec {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_element<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), Self::Error> {
         serde::ser::SerializeSeq::serialize_element(self, value)
     }
 
@@ -376,10 +361,7 @@ impl serde::ser::SerializeTupleStruct for SerializeVec {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_field<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), Self::Error> {
         serde::ser::SerializeSeq::serialize_element(self, value)
     }
 
@@ -392,10 +374,7 @@ impl serde::ser::SerializeTupleVariant for SerializeTupleVariant {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_field<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), Self::Error> {
         let serialized_value = value
             .serialize(FirestoreValueSerializer {
                 none_as_null: self.none_as_null,
@@ -432,10 +411,7 @@ impl serde::ser::SerializeMap for SerializeMap {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_key<T: ?Sized + Serialize>(&mut self, key: &T) -> Result<(), Self::Error> {
         let serializer = FirestoreValueSerializer {
             none_as_null: self.none_as_null,
         };
@@ -454,10 +430,7 @@ impl serde::ser::SerializeMap for SerializeMap {
         }
     }
 
-    fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    fn serialize_value<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), Self::Error> {
         match self.next_key.take() {
             Some(key) => {
                 let serializer = FirestoreValueSerializer {
@@ -492,14 +465,11 @@ impl serde::ser::SerializeStruct for SerializeMap {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_field<T: ?Sized>(
+    fn serialize_field<T: ?Sized + Serialize>(
         &mut self,
         key: &'static str,
         value: &T,
-    ) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    ) -> Result<(), Self::Error> {
         let serializer = FirestoreValueSerializer {
             none_as_null: self.none_as_null,
         };
@@ -527,14 +497,11 @@ impl serde::ser::SerializeStructVariant for SerializeStructVariant {
     type Ok = FirestoreValue;
     type Error = FirestoreError;
 
-    fn serialize_field<T: ?Sized>(
+    fn serialize_field<T: ?Sized + Serialize>(
         &mut self,
         key: &'static str,
         value: &T,
-    ) -> Result<(), Self::Error>
-    where
-        T: Serialize,
-    {
+    ) -> Result<(), Self::Error> {
         let serializer = FirestoreValueSerializer {
             none_as_null: self.none_as_null,
         };
diff --git a/src/firestore_serde/timestamp_serializers.rs b/src/firestore_serde/timestamp_serializers.rs
index ef08ac9..3a94f3d 100644
--- a/src/firestore_serde/timestamp_serializers.rs
+++ b/src/firestore_serde/timestamp_serializers.rs
@@ -231,10 +231,7 @@ pub fn serialize_timestamp_for_firestore<T: ?Sized + Serialize>(
             }
         }
 
-        fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        fn serialize_some<T: ?Sized + Serialize>(self, value: &T) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
@@ -257,27 +254,21 @@ pub fn serialize_timestamp_for_firestore<T: ?Sized + Serialize>(
             self.serialize_str(variant)
         }
 
-        fn serialize_newtype_struct<T: ?Sized>(
+        fn serialize_newtype_struct<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             value.serialize(self)
         }
 
-        fn serialize_newtype_variant<T: ?Sized>(
+        fn serialize_newtype_variant<T: ?Sized + Serialize>(
             self,
             _name: &'static str,
             _variant_index: u32,
             _variant: &'static str,
             _value: &T,
-        ) -> Result<Self::Ok, Self::Error>
-        where
-            T: Serialize,
-        {
+        ) -> Result<Self::Ok, Self::Error> {
             Err(FirestoreError::SerializeError(
                 FirestoreSerializationError::from_message(
                     "Timestamp serializer doesn't support this type",