php - Error Fatal error: Call to a member function insert() on a non-object -


i'm using callback after inserting in database, pass values other table, think method used fine. gives me error when inserting other table in database, in model, or in controller im kind of clueless in error, can please me. before put $this->load->database(); in autoload in config file :)

fatal error: call member function insert() on non-object

a php error encountered

severity: notice

message: undefined property: finances::$inventory_model

filename: controllers/finances.php

line number: 125

controller:

public function inventory_management($post_array,$primary_key)     {           $this->load->model('inventory_model');          if($post_array['id_expense']!=null){             $type = 'add';             $id_exp_detail = $primary_key;              $result = $this->inventory_model->insert([                 'id_exp_detail' => $id_exp_detail,                 'name' => $post_array['brand'],                 'quantity' => $post_array['item_quantity'],                 'lote' => $post_array['package_code'];                 'type' => $type,                 'date' => date(),                 'id_user' => $this->session->userdata('id_user'),                 'id_entity' => $this->session->userdata('id_entity')             ]);         }else if ($post_array['name']!=null){             $type = 'sub';             $id_treatment = $primary_key;              $result = $this->inventory_model->insert([                 'id_treatment' => $id_treatment,                 'name' => $post_array['name'],                 'quantity' => $post_data['recomended_dose'],                 'lote' => $post_array['id_package'],                 'type' => $type,                 'date' => date(),                 'id_user' => $this->session->userdata('id_user'),                 'id_entity' => $this->session->userdata('id_entity')             ]);         }else{             $type = 'sub';             $id_fertilization = $primary_key;              $result = $this->inventory_model->insert([                 'id_fertilization' => $id_fertilization,                 'name' => $post_data['name'],                 'quantity' => $post_data['quantity'],                 'lote' => $post_data['id_package'],                 'type' => $type,                 'date' => date(),                 'id_user' => $this->session->userdata('id_user'),                 'id_entity' => $this->session->userdata('id_entity')             ]);         }          if($result){             echo "validation complete";         }      }

model

class crud_model extends ci_model {      protected $_table = null;     protected $_primary_key = null;      // ------------------------------------------------------------------------      public function __construct()     {         parent::__construct();     }       public function insert($data)     {          $this->db->insert($this->_table, $data);         // return $this->db->insert_id();     }

model:

class inventory_model extends crud_model {     protected $_table = 'inventory_management';     protected $_primary_key = 'id';      // ------------------------------------------------------------------------      public function __construct()     {         parent::__construct();     }      // ------------------------------------------------------------------------  }

here wrong call wrong model file

$this->load->model('inventory_model');

it should be

$this->load->model('crud_model');

and use wrong way pass array in function 

$param = array('id_exp_detail' => $id_exp_detail, 'name' => $post_array['brand'], 'quantity' => $post_array['item_quantity'], 'lote' => $post_array['package_code'], 'type' => $type, 'date' => date(), 'id_user' => $this->session->userdata('id_user'), 'id_entity' => $this->session->userdata('id_entity'));   $result = $this->inventory_model->insert($param);

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