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Edit File: meta_model.php

<?php

class OsMetaModel extends OsModel {
	var $id,
	  $meta_key,
	  $meta_value,
	  $object_id,
	  $created_at,
	  $updated_at;

protected static $encrypted_settings = array();

function __construct( $object_id = false ) {
		$this->nice_names = array();
		$this->object_id  = $object_id;
		parent::__construct();
	}

public function delete_by_key( $meta_key, $object_id ) {
		if ( ! $object_id ) {
			return false;
		}
		$meta_to_delete = $this->where(
			array(
				'meta_key'  => $meta_key,
				'object_id' => $object_id,
			) 
		)->get_results_as_models();
		if ( $meta_to_delete ) {
			foreach ( $meta_to_delete as $meta_obj ) {
				$meta_obj->delete();
			}
		}
		return true;
	}

public function save_by_key( $meta_key, $meta_value, $object_id = false ) {
		if ( ! $object_id ) {
			$object_id = $this->object_id;
		}
		if ( ! $object_id ) {
			return false;
		}
		$existing_meta = $this->where(
			array(
				'meta_key'  => $meta_key,
				'object_id' => $object_id,
			) 
		)->set_limit( 1 )->get_results_as_models();
		if ( $existing_meta ) {
			$existing_meta->meta_value = self::prepare_value( $meta_key, $meta_value );
			if ( empty( $existing_meta->meta_value ) ) {
				return $existing_meta->delete();
			}
			return $existing_meta->save();
		} else {
			$new_meta             = $this;
			$new_meta->object_id  = $object_id;
			$new_meta->meta_key   = $meta_key;
			$new_meta->meta_value = self::prepare_value( $meta_key, $meta_value );
			return $new_meta->save();
		}
	}

private static function prepare_value( $meta_key, $meta_value ) {
		if ( in_array( $meta_key, self::$encrypted_settings ) ) {
			$meta_value = OsEncryptHelper::encrypt_value( $meta_value );
		}
		return $meta_value;
	}

public function get_by_key( $meta_key, $object_id = false, $default = false ) {
		if ( ! $object_id ) {
			$object_id = $this->object_id;
		}
		if ( ! $object_id ) {
			return $default;
		}
		$record = $this->where(
			array(
				'meta_key'  => $meta_key,
				'object_id' => $object_id,
			) 
		)->set_limit( 1 )->get_results_as_models();
		if ( $record ) {
			if ( in_array( $meta_key, self::$encrypted_settings ) ) {
				return OsEncryptHelper::decrypt_value( $record->meta_value );
			} else {
				return $record->meta_value;
			}
		} else {
			return $default;
		}
	}

public function get_by_object_id( $object_id = false, $default = [] ) {
		if ( ! $object_id ) {
			$object_id = $this->object_id;
		}
		if ( ! $object_id ) {
			return $default;
		}
		$records = $this->where( array( 'object_id' => $object_id ) )->get_results();
		if ( $records ) {
			$metas = [];
			foreach ( $records as $record ) {
				$value                      = in_array( $record->meta_key, self::$encrypted_settings ) ? OsEncryptHelper::decrypt_value( $record->meta_value ) : $record->meta_value;
				$metas[ $record->meta_key ] = $value;
			}
			return $metas;
		} else {
			return $default;
		}
	}

public function get_object_id_by_value( $meta_key, $meta_value ) {
		if ( ! $meta_value || ! $meta_key ) {
			return false;
		}
		$record = $this->select( 'object_id' )->where(
			array(
				'meta_key'   => $meta_key,
				'meta_value' => $meta_value,
			) 
		)->set_limit( 1 )->get_results_as_models();
		if ( $record ) {
			return $record->object_id;
		} else {
			return false;
		}
	}

protected function allowed_params( $role = 'admin' ) {
		$allowed_params = array(
			'object_id',
			'meta_key',
			'meta_value',
		);
		return $allowed_params;
	}
  
	protected function params_to_save( $role = 'admin' ) {
		$params_to_save = array(
			'object_id',
			'meta_key',
			'meta_value',
		);
		return $params_to_save;
	}

protected function properties_to_validate() {
		$validations = array(
			'object_id'  => array( 'presence' ),
			'meta_key'   => array( 'presence' ),
			'meta_value' => array( 'presence' ),
		);
		return $validations;
	}
}

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