How to check for Array in Database CodeIgniter and if they don't exist Add them

Question

So I just want to insert the data if the typed data does not exist and/or remove them if users decides to remove them; the problem is that it checks for more > 1 value.

This should be my last question of three in total(see my last two question on profile) regarding the same topic, relationships.

So I have three tables like the ones given below:

AI = auto increment.

ci_users: user_id(AI), username, slug, email, biography.

ci_terms: term_id(AI), title, slug, body.

ci_relationship: id(AI), term_id, user_id, type.

I'm actually trying to do this in a edit view in which I get all the terms from ci_terms and and the already(added directly in databse) ci_terms attached to the user with the following controller:

public function edit($id){

    // Verify user ID before updating/editing info
    if($this->session->userdata('user_id') != $id) {
        // Redirect to dashboard
        redirect('users/dashboard');
    }

    // Field Rules
    $this->form_validation->set_rules('email', 'Email', 'trim|required|min_length[7]|valid_email');

    if ($this->form_validation->run() == FALSE) {

        // Get user
        $data['item'] = $this->User_model->get($id);

        // Meta
        $data['title']  = $this->settings->title.' | Edit '. ucfirst($data['item']->username);

        // Get attached skills
        $skills = array();
        $skills[0] = 'Select Skills';

        $skills_attached = $this->User_model->the_skills($id);

        foreach($skills_attached as $skill){
            $skills[$skill->term_id] = $skill->term_id;
        }

        $data['skills'] = $skills;

        // Select Skills    
        $skill_options = array();
        $skill_options[0] = 'Select Skills';

        $skill_list = $this->Terms_model->get_list();

        foreach($skill_list as $cat){
            $skill_options[$cat->term_id] = $cat->title;
        }

        $data['skill_options'] = $skill_options;

        //Load View Into Template
        $this->template->load('public', 'default', 'users/edit', $data);

    } else {

        // Create User Data Array
        $data = array(
            'email'      => strip_tags($this->input->post('email')),
            'biography'  => strip_tags($this->input->post('biography')),
        );

        // Update User
        $this->User_model->update($id, $data);

        // BEGINNING OF HERE IS WHERE I NEED HELP

        // Here I try to check the selected ci_terms(term_id) in the database
        $existent_skill = $this->User_model->existent_skill($this->input->post('term_id'));

        // If the selected ci_terms(term_id) already exists, display an error
        if (!empty($existent_skill)) {

            // Create Message
            $this->session->set_flashdata('error', 'You already have that one or more of those selected skills');

            // Redirect to pages
            redirect('users/edit/'.$id.'/'.$id->username);

        } else {

            // Display the data from ci_terms table
            $skills = $this->Terms_model->get_list();

            // Expect data to be array
            $data = array();

            foreach ($skills as $skill){
                $data[] = array(
                    // The main problem how do I add the correct IDs to the array?
                    'term_id'   => $skill->id,
                    'user_id'   => $this->session->userdata('user_id'),
                    'type'      =>  'skill',
                );
            }

            // If terms selected, add them
            $this->db->insert_batch('ci_relationship', $data);

            // I'm also trying to figure out a way to remove the terms that are already attached to the user if he/she decides not to want those skill anymore, any suggestion will be taken into practice.
            // else if terms unselected, remove them
            $this->User_model->delete_skills($id, $terms_id, $data);

            // END OF HERE IS WHERE I NEED HELP

        }

        // Create Message
        $this->session->set_flashdata('success', "You're account has been updated");

        // Redirect to profile
        redirect('users/dashboard');
    }
}

Here is how I get to display the attached(to user) terms from the ci_terms table into the view:

public function the_skills($id){

    $this->db->select('*');
    $this->db->from($this->relationship);
    $this->db->where('user_id', $id);
    $this->db->where('type', 'skill');

    $query = $this->db->get();

    if($query->num_rows() >= 1){
        return $query->result();
    } else {
        return false;
    }
}

This is the method which I'm still trying to create that checks for all the selected terms before adding them if they don't exist:

// Verify if relationship already exists
public function existent_skill($term_id) {
    $query = $this->db->get_where($this->relationship, array(
        'user_id' => $this->session->userdata('user_id'),
        'term_id' => $term_id,
        'type' => 'skill',
    ));
    return $query->row_array();
}

to continue, here is the function which is supposed(not tested) to delete them if they're unselected from the input:

// Delete un-selected skills
public function delete_skills($id, $terms_id, $data){
    $this->db->from($this->relationship);
    $this->db->where('user_id', $id);
    $this->db->where_in('term_id', $terms_id);
    $this->db->where('type', 'skill');

    $this->db->delete($this->relationship, $data);
}

Finally here is the view in which I'm using a dropdown with select2:

<!-- Skills -->
<div class="form-group">
    <?php echo form_label('Skills', 'skills'); ?>
    <div class="input-group date"><div class="input-group-addon"><i class="fa fa-star" aria-hidden="true"></i></div>
            <?php
                $data = array(
                    'id'        => 'term_id[]',
                    'name'      => 'term_id[]',
                );
                $class = array(
                    'class'     =>  'form-control js-example-basic-multiple',
                    'multiple'  => TRUE,
                );
            ?>
            <!-- $data is to provide the dropdown with the id and name -->
            <!-- $skill_options is to get the terms from ci_terms in case the user wants to add them as their skill -->
            <!-- $skills is to get the current term_id attached to the user which were added in the db -->
            <!-- $class is to give the class of js-example-basic-multiple to enable select2 -->
            <?= form_dropdown($data, $skill_options, $skills, $class); ?>
            <script type="text/javascript">
            // Select2 Input
            $(document).ready(function () {
                $('.js-example-basic-multiple').select2({
                    tags: true,
                    tokenSeparators: [',', ' '],
allowClear: true,
    selectOnClose: false,
    selectOnBlur: false,
                });
            });
            </script>
    </div>
</div>

BELOW ARE JUST IMAGES

So what I'm trying to achieve is this:

As you can see there HTML5(term_id, 1) and CSS(term_id, 2) are the attached term_id's and if I deselect them, they should be deleted from ci_relationship after clicking the update button and the same(not really) goes when selecting new terms that are not attached, they should be added.

Is pretty much a relationship system like the one WordPress uses.

Thanks in advance.

Answer 1

I guess you are overthinking here to much - you should just delete all items related to that user and after that insert the new ones which are selected...

an example for your model function could be

public function updateSkills(array $arrSkills)
{
    //in case if the array is empty you can stop the process here
    if (empty($arrSkills))  return false;

    //kill all associated items
    $this->db
        ->where('user_id', $this->session->userdata('user_id'))
        ->where('type', 'skill');
        ->delete('ci_relationship');

    //insert all items
    $arrInsertData = [];

    foreach($arrSkills AS $strSkill)
    {
        $arrInsertData[] = [
            'term_id' => $strSkill,
            'user_id' => $this->session->userdata('user_id'),
            'type' => 'skill'
        ]
    }

    $this->db->insert_batch('ci_relationship', $arrInsertData);

    return true;
}

and the part in your controller could look like

$data = array(
    'email'      => strip_tags($this->input->post('email')),
    'biography'  => strip_tags($this->input->post('biography')),
);

// Update User
$this->User_model->update($id, $data);

// BEGINNING OF HERE IS WHERE I NEED HELP
$blnSuccess = $this->User_model->updateSkills($this->input->post('term_id[]'));

of course you can also add a rule, in case if term_id is required

$this->form_validation->set_rules('term_id[]', 'Term', 'trim|required');