I'm using simple_form and I only want the
value: @image.start_at.strftime("%m/%d/%Y %I:%M %p") %> to execute if @image.start_at has a value.
<div class="input-group date" id="datetimepicker"> <%= f.text_field :start_at, class: 'form-control', value: @image.start_at.strftime("%m/%d/%Y %I:%M %p") %> <span class="input-group-addon"> <span class="glyphicon glyphicon-calendar"></span> </span> </div>
For example, this is from my image create/update _form and this works seemingly exactly how I want it to if I already have an image that has a start_at value. However, when I am creating a new image and there is no start_at value yet how can I say don't try to put this value in the input? I'm not interested in having a default value.