Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title> Confused -.-' </title>
</head>
<body>
<div class="content-section">

    <form action="" method="post">
        {{ main_form.hidden_tag() }}
        {{ main_form.title.label(class="form-control-label") }}: {{ main_form.title(class="form-control form-control-lg") }}

        {% for entry_line in main_form.entries %}
            <div class="form-group">
                {{ entry_line.content.label(class="form-control-label") }}
                {{ entry_line.content.data(class="form-control form-control-lg") }}
            </div>
        {% endfor %}

        {# For the main form I use main_form.title(), main_form.submit(), etc - without .data(). #}
        {# If I try to do main_form.title.data() I get the ex that I can't call on 'str' #}

        {# But, for entry_lines, if I don't add .data() and just use entry_line.content()  #}
        {# I can see the input field, but it's prepopulated with HTML for that input instead of the value (that I see in that html) #}

        <div class="form-group">
            {{ main_form.submit(class="btn btn-outline-info") }}
        </div>
    </form>

</div>
</body>
</html>