Add postgres code

- Set is currently working
- Other methods to test

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

heromodels/examples/postgres_model_example.rs

@@ -0,0 +1,225 @@
+use heromodels::db::postgres::Config;
+use heromodels::db::{Collection, Db};
+use heromodels::models::userexample::user::user_index::{is_active, username};
+use heromodels::models::{Comment, User};
+use heromodels_core::Model;
+
+// Helper function to print user details
+fn print_user_details(user: &User) {
+    println!("\n--- User Details ---");
+    println!("ID: {}", user.get_id());
+    println!("Username: {}", user.username);
+    println!("Email: {}", user.email);
+    println!("Full Name: {}", user.full_name);
+    println!("Active: {}", user.is_active);
+    println!("Created At: {}", user.base_data.created_at);
+    println!("Modified At: {}", user.base_data.modified_at);
+    println!("Comments: {:?}", user.base_data.comments);
+}
+
+// Helper function to print comment details
+fn print_comment_details(comment: &Comment) {
+    println!("\n--- Comment Details ---");
+    println!("ID: {}", comment.get_id());
+    println!("User ID: {}", comment.user_id);
+    println!("Content: {}", comment.content);
+    println!("Created At: {}", comment.base_data.created_at);
+    println!("Modified At: {}", comment.base_data.modified_at);
+}
+
+fn main() {
+    let db = heromodels::db::postgres::Postgres::new(
+        Config::new()
+            .user(Some("postgres".into()))
+            .password(Some("test123".into()))
+            .host(Some("localhost".into()))
+            .port(Some(5432)),
+    )
+    .expect("Can connect to postgress");
+
+    println!("Hero Models - Basic Usage Example");
+    println!("================================");
+
+    // Create users with auto-generated IDs
+
+    // User 1
+    let user1 = User::new()
+        .username("johndoe")
+        .email("john.doe@example.com")
+        .full_name("John Doe")
+        .is_active(false)
+        .build();
+
+    // User 2
+    let user2 = User::new()
+        .username("janesmith")
+        .email("jane.smith@example.com")
+        .full_name("Jane Smith")
+        .is_active(true)
+        .build();
+
+    // User 3
+    let user3 = User::new()
+        .username("willism")
+        .email("willis.masters@example.com")
+        .full_name("Willis Masters")
+        .is_active(true)
+        .build();
+
+    // User 4
+    let user4 = User::new()
+        .username("carrols")
+        .email("carrol.smith@example.com")
+        .full_name("Carrol Smith")
+        .is_active(false)
+        .build();
+
+    // Save all users to database and get their assigned IDs and updated models
+    let (user1_id, db_user1) = db
+        .collection()
+        .expect("can open user collection")
+        .set(&user1)
+        .expect("can set user");
+    let (user2_id, db_user2) = db
+        .collection()
+        .expect("can open user collection")
+        .set(&user2)
+        .expect("can set user");
+    let (user3_id, db_user3) = db
+        .collection()
+        .expect("can open user collection")
+        .set(&user3)
+        .expect("can set user");
+    let (user4_id, db_user4) = db
+        .collection()
+        .expect("can open user collection")
+        .set(&user4)
+        .expect("can set user");
+
+    println!("User 1 assigned ID: {}", user1_id);
+    println!("User 2 assigned ID: {}", user2_id);
+    println!("User 3 assigned ID: {}", user3_id);
+    println!("User 4 assigned ID: {}", user4_id);
+
+    // We already have the updated models from the set method, so we don't need to retrieve them again
+
+    // Print all users retrieved from database
+    println!("\n--- Users Retrieved from Database ---");
+    println!("\n1. First user:");
+    print_user_details(&db_user1);
+
+    println!("\n2. Second user:");
+    print_user_details(&db_user2);
+
+    println!("\n3. Third user:");
+    print_user_details(&db_user3);
+
+    println!("\n4. Fourth user:");
+    print_user_details(&db_user4);
+
+    // Demonstrate different ways to retrieve users from the database
+
+    // 1. Retrieve by username index
+    println!("\n--- Retrieving Users by Different Methods ---");
+    println!("\n1. By Username Index:");
+    let stored_users = db
+        .collection::<User>()
+        .expect("can open user collection")
+        .get::<username, _>("johndoe")
+        .expect("can load stored user");
+
+    assert_eq!(stored_users.len(), 1);
+    print_user_details(&stored_users[0]);
+
+    // 2. Retrieve by active status
+    println!("\n2. By Active Status (Active = true):");
+    let active_users = db
+        .collection::<User>()
+        .expect("can open user collection")
+        .get::<is_active, _>(&true)
+        .expect("can load stored users");
+
+    assert_eq!(active_users.len(), 2);
+    for (_i, active_user) in active_users.iter().enumerate() {
+        print_user_details(active_user);
+    }
+
+    // 3. Delete a user and show the updated results
+    println!("\n3. After Deleting a User:");
+    let user_to_delete_id = active_users[0].get_id();
+    println!("Deleting user with ID: {}", user_to_delete_id);
+    db.collection::<User>()
+        .expect("can open user collection")
+        .delete_by_id(user_to_delete_id)
+        .expect("can delete existing user");
+
+    // Show remaining active users
+    let active_users = db
+        .collection::<User>()
+        .expect("can open user collection")
+        .get::<is_active, _>(&true)
+        .expect("can load stored users");
+
+    println!("   a. Remaining Active Users:");
+    assert_eq!(active_users.len(), 1);
+    for (_i, active_user) in active_users.iter().enumerate() {
+        print_user_details(active_user);
+    }
+
+    // Show inactive users
+    let inactive_users = db
+        .collection::<User>()
+        .expect("can open user collection")
+        .get::<is_active, _>(&false)
+        .expect("can load stored users");
+
+    println!("   b. Inactive Users:");
+    assert_eq!(inactive_users.len(), 2);
+    for (_i, inactive_user) in inactive_users.iter().enumerate() {
+        print_user_details(inactive_user);
+    }
+
+    println!("\n--- User Model Information ---");
+    println!("User DB Prefix: {}", User::db_prefix());
+
+    // Demonstrate comment creation and association with a user
+    println!("\n--- Working with Comments ---");
+
+    // 1. Create and save a comment
+    println!("\n1. Creating a Comment:");
+    let comment = Comment::new()
+        .user_id(db_user1.get_id()) // commenter's user ID
+        .content("This is a comment on the user")
+        .build();
+
+    // Save the comment and get its assigned ID and updated model
+    let (comment_id, db_comment) = db
+        .collection()
+        .expect("can open comment collection")
+        .set(&comment)
+        .expect("can set comment");
+
+    println!("Comment assigned ID: {}", comment_id);
+
+    println!("   a. Comment Retrieved from Database:");
+    print_comment_details(&db_comment);
+
+    // 3. Associate the comment with a user
+    println!("\n2. Associating Comment with User:");
+    let mut updated_user = db_user1.clone();
+    updated_user.base_data.add_comment(db_comment.get_id());
+
+    // Save the updated user and get the new version
+    let (_, user_with_comment) = db
+        .collection::<User>()
+        .expect("can open user collection")
+        .set(&updated_user)
+        .expect("can set updated user");
+
+    println!("   a. User with Associated Comment:");
+    print_user_details(&user_with_comment);
+
+    println!("\n--- Model Information ---");
+    println!("User DB Prefix: {}", User::db_prefix());
+    println!("Comment DB Prefix: {}", Comment::db_prefix());
+}