/* POST new exercise */
router.post('/user/:_id/tasklist/add', function(req, res, next){

    var _id = req.params._id;
    console.log("Add task for user id " + _id)

    if (!req.user || !req.body || !req.body.text) {
        //no task text info, redirect to home page with flash message
        req.flash('error', 'please enter an exercise');
        res.redirect('user/:_id/tasklist');
    }

    else {

        // Insert into db. New tasks are assumed to be not completed.
        var dateCreated = new Date();
        // Create a new Task, an instance of the Task schema, and call save()
        new Task( { user: _id , text: req.body.text, completed: false, dateCreated: new Date()} ).save()
            .then((newTask) => {
                console.log('The new exercise created is: ', newTask);
                res.redirect('user/:_id/tasklist');
            })
            .catch((err) => {
                next(err);   // most likely to be db error.
            });
    }
});

<h1>EXERCISES</h1>
<div class="taskinfo">
<div class="addtask">
    <form method="POST" action="/tasks/user/{{user.id}}/tasklist/add" class="add_form">
        <input id="addtask_text" name="text" type="text" placeholder="Enter an exercise" required>
        <input type="hidden" name="_id" value="{{user._id}}">
        <input class="addtask_button" type="submit" value="ADD Exercise">
    </form>
</div>

<div class="messages">
    {{#if messages}}
        <p class="error_msg">{{messages.error}}</p>
        <p class="info_msg">{{messages.info}}</p>
    {{/if}}
</div>

<div class="tasklist">
    {{#each tasks}}
        <p>{{@tasklist}}: <a href="/user/{{user.id}}/tasklist/{{this._id}}">{{this.text}}</a></p>


        <form action="/user/{{user._id}}/tasklist/done" method="POST" class="done_form">
            <input type="hidden" name="_id" value="{{this._id}}">
            <input class="done_button" type="submit" name="done" value="Done">
        </form>

        <form action="/user/{{user._id}}/tasklist/delete" method="POST" class="delete_form">
            <input type="hidden" name="_id" value="{{this._id}}">
            <input class="delete_button" type="submit" name="done" value="Delete">
        </form>
    {{else}}
        <p>There are no exercises. Time to create a list!</p>
    {{/each}}