Not inserting null values - php

Question

I am trying to insert multiple values in the todo input of the form. but if i do not input a value to any input the null value is inserted in the database. This is my controller action:
public function actionAdd()
{
if (Yii::$app->request->isAjax) {
$request = Yii::$app->request;
$add = new Project();
$add->project_name = $request->post('project');
$add->deadline = $request->post('deadline');
$add->profile_id = $request->post('profile_id');
$add->project_status = "Running";
$add->save();
$getlast = Yii::$app->db->getLastInsertId();
$todo = $request->post('todo');
if (isset($todo)) {
foreach ($todo as $to) {
$add = new Todo();
$add->todo_name=$to;
$add->status="Running";
$add->project_id=$getlast;
$add->save();
}
}
echo json_encode(TRUE); die;
}
echo json_encode(FALSE);die;
}
the form is:
<form class="formclass" method="POST" action="<?php echo Yii::$app->request->baseUrl;?>/todo/add/" role="form" id="register-form" novalidate="novalidate">
<label> Project Name: </label> <input type="name" name="project" class="form-control" placeholder="Project Name" required><br><br>
<input type="hidden" name="profile_id" value="<?php echo $profile_id;?>">
<label> Todo: </label><br>
<textarea type="text" name="todo[]" placeholder="Todo Description..."></textarea>
<div id="dynamicInput">
<span class="glyphicon glyphicon-plus" onClick="addInput('dynamicInput');"></span>
</div><br>
<label> Project Deadline:</label><br>
<input type="date" name="deadline"><br><br>
<button type="submit" class="btn btn-default">Add Project</button><BR><BR>
</form>
And the jquery is:
var counter = 1;
var limit = 10;
function addInput(divName)
{
if (counter != limit)
{
var newdiv = document.createElement('div');
newdiv.innerHTML = "<br><textarea type='text' name='todo[]' placeholder='Todo Description...'></textarea>";
document.getElementById(divName).appendChild(newdiv);
counter++;
}
}

Answer 1

Could be you problem is related to the validation rules ..
for check this and only for debugging try use $add->savel(false)
$add = new Todo();
$add->todo_name=$to;
$add->status="Running";
$add->project_id=$getlast;
$add->save(false);
if in this case the rows are inserted the check for validations rule (eventually comment temporary) .. for find the wrong rules or condition