app/views/tasks/_form.html.erb
<%= form_for([@project, @task], html: {class: "form-horizontal"}) do |f| %>
<div class="col-sm-6 row">
<div class="field form-group">
<div class="col-sm-offset-3 col-sm-9">
<%= render 'shared/errors', model: @task %>
</div>
</div>
<div class="field form-group">
<%= f.label :task, :class => 'col-sm-3 control-label' %>
<div class="col-sm-9">
<%= f.text_field :task, :class => "form-control"%>
</div>
</div>
<div class="field form-group">
<%= f.label :due_date, :class => 'col-sm-3 control-label' %>
<div class="col-sm-9">
<%= f.date_field :due_date, :class => "col-sm-10 form-control" %>
</div>
</div>
<% if @task.id %>
<div class="form-group">
<div class="col-sm-offset-1 col-sm-11">
<div class="checkbox">
<label>
<%= f.check_box :complete %> Complete
</label>
</div>
</div>
</div>
<% else %>
<% @task.complete = false %>
<%end%>
<div class="actions field form-group">
<div class="col-sm-offset-3 col-sm-9">
<%= f.submit class: "btn btn-primary" %>
</div>
</div>
</div>
<br>
<% end %>