Question

I’m writing a simple app. I need to block user from a page if their credit is < 0.

I have a table “User_profiles” with a “credit” row.

How can I set up a model in conjunction with the controller to send the user to another page if the value of “credit” is 0?

This should be straightforward, but I’m new at the select->where stuff…

It has to be the row of the current user too–I don’t know how to traverse arrays very well yet.

Thanks!

Answer 1

Well, the easiest solution would be to just load a different view…

As for the model, it would look like this:

class UserModel extends Model {
    public function getUserCredit($id) {
        $this->load->database();
        //effectively generates: SELECT `credit` FROM `User_profiles` WHERE `id`=$id
        $query = this->db->select('credit')->where('id',$id)->get('User_profiles');
        //row() executes the query for a single result, returns the credit property
        return $query->row()->credit;
    }
}

Then in the controller:

class Users extends Controller {
    //....
    public function credit() {
        $this->load->model('userModel','users');
        // assuming the session library has been loaded
        $user_id = $this->session->userdata('id');
        $credit = $this->users->getUserCredit($user_id);
        if ($credit == '0') $this->load->view('users/no_credit');
        else $this->load->view('users/credit');
    }
}

That’s untested, but it should at least help you get the idea.

---

1. When you request the page /users/credit/1, CI will call the Users::credit(1) action.

2. It then loads UserModel as $this->users

3. You call $this->users->getUserCredit(1), which translates to UserModel::getUserCredit(1), to store as $credit

4. The model loads the database.

5. You tell the db to select('credit') (select the credit column), where('id',1) (where the id = 1), then get('User_profiles') (get matching rows from the User_profiles table). That returns a query, which you store as $query for readability.

6. getUserCredit returns the credit property of the single-row result of the query

7. If $credit == 0, you load the view views/users/no_credit.php

8. Otherwise, you load the view views/users/credit.php (it’s conventional to name the views after the actions they represent and put them in a folder corresponding to the controller)