Can create conversations

src/helpers/ConversationsHelper.ts

@@ -1,5 +1,6 @@
-import { Conversation } from "../entities/Conversation";
+import { Conversation, BaseConversation } from "../entities/Conversation";
 import { DatabaseHelper } from "./DatabaseHelper";
+import { time } from "../utils/DateUtils";
 
 /**
  * Conversations helper
@@ -13,6 +14,53 @@ const MESSAGES_TABLE = "comunic_conversations_messages";
 
 export class ConversationsHelper {
 
+	/**
+	 * Create a new conversation
+	 * 
+	 * @param conv Information about the conversation to create
+	 */
+	public static async Create(conv : BaseConversation) : Promise<number> {
+
+		// Create the conversation in the main table
+		const convID = await DatabaseHelper.InsertRow(LIST_TABLE, {
+			"user_id": conv.ownerID,
+			"name": conv.name,
+			"last_active": time(),
+			"creation_time": time()
+		});
+
+		// Add the members to the conversation
+		for (const userID of conv.members) {
+			await this.AddMember(
+				convID, 
+				userID, 
+				conv.ownerID == userID ? conv.following : true);
+		}
+
+		return convID;
+	}
+
+	/**
+	 * Add a member to a conversation
+	 * 
+	 * @param convID Conversation ID
+	 * @param userID User ID
+	 * @param following Specify whether the user is following
+	 * the conversation or not
+	 */
+	private static async AddMember(convID : number, userID: number, following : boolean = true) {
+		await DatabaseHelper.InsertRow(
+			USERS_TABLE,
+			{
+				"conv_id": convID,
+				"user_id": userID,
+				"time_add": time(),
+				"following": following ? 1 : 0,
+				"saw_last_message": 1
+			}
+		);
+	}
+
 	/**
 	 * Get the list of conversations of the user
 	 * 

src/helpers/UserHelper.ts

@@ -32,6 +32,20 @@ export class UserHelper {
 		return this.DbToUser(result);
 	}
 
+	/**
+	 * Check out whether a user exists or not
+	 * 
+	 * @param id The ID of the user to check
+	 */
+	public static async Exists(id: number) : Promise<boolean> {
+		return await DatabaseHelper.Count({
+			table: TABLE_NAME,
+			where: {
+				ID: id
+			}
+		}) > 0;
+	}
+
 	/**
 	 * Search for user in the database
 	 *