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POHow does codeigniter know how to pass parameters from controller to the model
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2013-07-06T08:59:03.210
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I am starting to learn codeigniters active record and i am querying my database using parameters passed from the controller to the model. First i am passing the id from the controller to the model and that works. Controller <pre><code>function bret($id){ $this->load->model('school_model'); $data = $this->school_model->get_city_and_population($id); foreach ($data as $row) { echo "Name Of The City...........". $row['Name']; echo " "; echo "Total Population...........".$row['Population']; } } </code></pre> Model <pre><code>function get_city_and_population($id){ $this->db->select('Name,Population'); $query = $this->db->get_where('city', array('ID'=>$id)); return $query->result_array(); } </code></pre> I went ahead and put in multiple parameters expecting to fail but this works but i am not so sure why it worked or what worked. Controller <pre><code>public function parameters($id,$name,$district){ $this->load->model('school_model'); $data = $this->school_model->multiple_parameters($id,$name,$district); foreach ($data as $row) { echo "Total Population...........".$row['Population']; } } </code></pre> Model <pre><code>function multiple_parameters($id,$name,$district){ $this->db->select('Population'); $query = $this->db->get_where('city', array('ID'=>$id,'Name'=>$name,'District'=>$district)); return $query->result_array(); } </code></pre> In my multiple parameters example i visited <code>http://example.com/env/at/index.php/frontpage/parameters/7/Haag/Zuid-Holland/</code> Here,i know the name <code>Haag</code> is in id <code>7</code> and the district is <code>Zuid-Holland</code> Here are my questions.How does codeigniter know how to pass the parameters from the url to the model and secondly,what if i was slightly wrong like <code>7/Haag/Zuid-Hollandes/</code>,how would i show the user that,that url is wrong and fallback to a default value instead of showing blank when the parameters are wrong?.
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How does codeigniter know how to pass parameters from controller to the model
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