312 lines
11 KiB
Text
312 lines
11 KiB
Text
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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class Customers_Model extends CI_Model {
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/**
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* Class Constructor
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*/
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public function __construct() {
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parent::__construct();
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}
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/**
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* Add a customer record to the database.
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*
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* This method adds a customer to the database. If the customer
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* doesn't exists it is going to be inserted, otherwise the
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* record is going to be updated.
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*
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* @param array $customer Associative array with the customer's
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* data. Each key has the same name with the database fields.
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* @return int Returns the customer id.
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*/
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public function add($customer) {
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// Validate the customer data before doing anything.
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$this->validate($customer);
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// :: CHECK IF CUSTOMER ALREADY EXIST (FROM EMAIL).
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if ($this->exists($customer) && !isset($customer['id'])) {
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// Find the customer id from the database.
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$customer['id'] = $this->find_record_id($customer);
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}
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// :: INSERT OR UPDATE CUSTOMER RECORD
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if (!isset($customer['id'])) {
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$customer['id'] = $this->insert($customer);
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} else {
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$this->update($customer);
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}
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return $customer['id'];
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}
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/**
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* Check if a particular customer record already exists.
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*
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* This method checks wether the given customer already exists in
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* the database. It doesn't search with the id, but with the following
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* fields: "email"
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*
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* @param array $customer Associative array with the customer's
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* data. Each key has the same name with the database fields.
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* @return bool Returns wether the record exists or not.
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*/
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public function exists($customer) {
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if (!isset($customer['email'])) {
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throw new Exception('Customer\'s email is not provided.');
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}
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// This method shouldn't depend on another method of this class.
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$num_rows = $this->db
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->select('*')
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->from('ea_users')
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->join('ea_roles', 'ea_roles.id = ea_users.id_roles', 'inner')
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->where('ea_users.email', $customer['email'])
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->where('ea_roles.slug', DB_SLUG_CUSTOMER)
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->get()->num_rows();
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return ($num_rows > 0) ? TRUE : FALSE;
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}
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/**
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* Insert a new customer record to the database.
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*
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* @param array $customer Associative array with the customer's
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* data. Each key has the same name with the database fields.
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* @return int Returns the id of the new record.
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*/
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private function insert($customer) {
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// Before inserting the customer we need to get the customer's role id
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// from the database and assign it to the new record as a foreign key.
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$customer_role_id = $this->db
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->select('id')
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->from('ea_roles')
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->where('slug', DB_SLUG_CUSTOMER)
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->get()->row()->id;
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$customer['id_roles'] = $customer_role_id;
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if (!$this->db->insert('ea_users', $customer)) {
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throw new Exception('Could not insert customer to the database.');
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}
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return intval($this->db->insert_id());
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}
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/**
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* Update an existing customer record in the database.
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*
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* The customer data argument should already include the record
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* id in order to process the update operation.
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*
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* @param array $customer Associative array with the customer's
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* data. Each key has the same name with the database fields.
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* @return int Returns the updated record id.
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*/
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private function update($customer) {
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// Do not update empty string values.
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foreach ($customer as $key => $value) {
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if ($value === '')
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unset($customer[$key]);
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}
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$this->db->where('id', $customer['id']);
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if (!$this->db->update('ea_users', $customer)) {
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throw new Exception('Could not update customer to the database.');
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}
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return intval($customer['id']);
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}
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/**
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* Find the database id of a customer record.
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*
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* The customer data should include the following fields in order to
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* get the unique id from the database: "email"
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*
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* <strong>IMPORTANT!</strong> The record must already exists in the
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* database, otherwise an exception is raised.
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*
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* @param array $customer Array with the customer data. The
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* keys of the array should have the same names as the db fields.
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* @return int Returns the id.
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*/
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public function find_record_id($customer) {
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if (!isset($customer['email'])) {
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throw new Exception('Customer\'s email was not provided : '
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. print_r($customer, TRUE));
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}
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// Get customer's role id
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$result = $this->db
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->select('ea_users.id')
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->from('ea_users')
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->join('ea_roles', 'ea_roles.id = ea_users.id_roles', 'inner')
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->where('ea_users.email', $customer['email'])
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->where('ea_roles.slug', DB_SLUG_CUSTOMER)
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->get();
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if ($result->num_rows() == 0) {
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throw new Exception('Could not find customer record id.');
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}
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return $result->row()->id;
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}
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/**
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* Validate customer data before the insert or update operation is executed.
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*
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* @param array $customer Contains the customer data.
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* @return bool Returns the validation result.
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*/
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public function validate($customer) {
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$this->load->helper('data_validation');
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// If a customer id is provided, check whether the record
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// exist in the database.
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if (isset($customer['id'])) {
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$num_rows = $this->db->get_where('ea_users',
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array('id' => $customer['id']))->num_rows();
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if ($num_rows == 0) {
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throw new Exception('Provided customer id does not '
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. 'exist in the database.');
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}
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}
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// Validate required fields
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if (!isset($customer['last_name'])
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|| !isset($customer['email'])
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|| !isset($customer['phone_number'])) {
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throw new Exception('Not all required fields are provided : '
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. print_r($customer, TRUE));
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}
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// Validate email address
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if (!filter_var($customer['email'], FILTER_VALIDATE_EMAIL)) {
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throw new Exception('Invalid email address provided : '
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. $customer['email']);
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}
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// When inserting a record the email address must be unique.
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$customer_id = (isset($customer['id'])) ? $customer['id'] : '';
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$num_rows = $this->db
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->select('*')
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->from('ea_users')
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->join('ea_roles', 'ea_roles.id = ea_users.id_roles', 'inner')
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->where('ea_roles.slug', DB_SLUG_CUSTOMER)
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->where('ea_users.email', $customer['email'])
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->where('ea_users.id <>', $customer_id)
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->get()
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->num_rows();
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if ($num_rows > 0) {
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throw new Exception('Given email address belongs to another customer record. '
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. 'Please use a different email.');
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}
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return TRUE;
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}
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/**
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* Delete an existing customer record from the database.
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*
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* @param numeric $customer_id The record id to be deleted.
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* @return bool Returns the delete operation result.
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*/
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public function delete($customer_id) {
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if (!is_numeric($customer_id)) {
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throw new Exception('Invalid argument type $customer_id : ' . $customer_id);
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}
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$num_rows = $this->db->get_where('ea_users', array('id' => $customer_id))->num_rows();
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if ($num_rows == 0) {
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return FALSE;
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}
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return $this->db->delete('ea_users', array('id' => $customer_id));
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}
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/**
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* Get a specific row from the appointments table.
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*
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* @param numeric $customer_id The record's id to be returned.
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* @return array Returns an associative array with the selected
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* record's data. Each key has the same name as the database
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* field names.
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*/
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public function get_row($customer_id) {
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if (!is_numeric($customer_id)) {
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throw new Exception('Invalid argument provided as $customer_id : ' . $customer_id);
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}
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return $this->db->get_where('ea_users', array('id' => $customer_id))->row_array();
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}
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/**
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* Get a specific field value from the database.
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*
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* @param string $field_name The field name of the value to be
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* returned.
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* @param int $customer_id The selected record's id.
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* @return string Returns the records value from the database.
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*/
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public function get_value($field_name, $customer_id) {
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if (!is_numeric($customer_id)) {
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throw new Exception('Invalid argument provided as $customer_id : '
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. $customer_id);
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}
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if (!is_string($field_name)) {
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throw new Exception('$field_name argument is not a string : '
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. $field_name);
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}
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if ($this->db->get_where('ea_users', array('id' => $customer_id))->num_rows() == 0) {
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throw new Exception('The record with the $customer_id argument '
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. 'does not exist in the database : ' . $customer_id);
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}
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$row_data = $this->db->get_where('ea_users', array('id' => $customer_id)
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)->row_array();
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if (!isset($row_data[$field_name])) {
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throw new Exception('The given $field_name argument does not'
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. 'exist in the database : ' . $field_name);
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}
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$customer = $this->db->get_where('ea_users', array('id' => $customer_id))->row_array();
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return $customer[$field_name];
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}
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/**
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* Get all, or specific records from appointment's table.
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*
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* @example $this->Model->getBatch('id = ' . $recordId);
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*
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* @param string $whereClause (OPTIONAL) The WHERE clause of
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* the query to be executed. DO NOT INCLUDE 'WHERE' KEYWORD.
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* @return array Returns the rows from the database.
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*/
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public function get_batch($where_clause = '') {
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$customers_role_id = $this->get_customers_role_id();
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if ($where_clause != '') {
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$this->db->where($where_clause);
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}
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$this->db->where('id_roles', $customers_role_id);
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return $this->db->get('ea_users')->result_array();
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}
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/**
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* Get the customers role id from the database.
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*
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* @return int Returns the role id for the customer records.
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*/
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public function get_customers_role_id() {
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return $this->db->get_where('ea_roles', array('slug' => DB_SLUG_CUSTOMER))->row()->id;
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}
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}
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/* End of file customers_model.php */
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/* Location: ./application/models/customers_model.php */
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