Re-implement user relationships.

src/routes/users/remove_friend.rs

@@ -0,0 +1,52 @@
+use crate::{database::entities::RelationshipStatus, database::guards::reference::Ref, database::entities::User, database::permissions::get_relationship, util::result::Error, database::get_collection};
+use rocket_contrib::json::JsonValue;
+use crate::util::result::Result;
+use mongodb::bson::doc;
+use futures::try_join;
+
+#[delete("/<target>/friend")]
+pub async fn req(user: User, target: Ref) -> Result<JsonValue> {
+    let col = get_collection("users");
+
+    match get_relationship(&user, &target) {
+        RelationshipStatus::Blocked |
+        RelationshipStatus::BlockedOther |
+        RelationshipStatus::User |
+        RelationshipStatus::None => Err(Error::NoEffect),
+        RelationshipStatus::Friend |
+        RelationshipStatus::Outgoing |
+        RelationshipStatus::Incoming => {
+            match try_join!(
+                col.update_one(
+                    doc! {
+                        "_id": &user.id
+                    },
+                    doc! {
+                        "$pull": {
+                            "relations": {
+                                "_id": &target.id
+                            }
+                        }
+                    },
+                    None
+                ),
+                col.update_one(
+                    doc! {
+                        "_id": &target.id
+                    },
+                    doc! {
+                        "$pull": {
+                            "relations": {
+                                "_id": &user.id
+                            }
+                        }
+                    },
+                    None
+                )
+            ) {
+                Ok(_) => Ok(json!({ "status": "None" })),
+                Err(_) => Err(Error::DatabaseError { operation: "update_one", with: "user" })
+            }
+        }
+    }
+}