rails forms updating a db record

Question

I would like to rewrite a form which is used to update a record on a database. I want to update the form so that the form input does not show the record, as the record is outputted by the line

<%= q.object.content %>.

I want the form input not to display the record, and I want that the record is updated when the input field is edited, and is not edited when it is left blank.

I am new at working with forms and don't know the best way to achieve this.

Can anyone provide any help on achieving this ? Below is the current form. Any help would be appreciated.

<%= semantic_form_for @bunchOfThings do |f| %>
    <%= f.inputs do %>
        <%= f.semantic_fields_for :aThing, @aThing do |q| %>
            <%= q.object.content %> 
            <%= q.input :content, label: "A Thing: #{q.object.content}" %>
        <% end %>
    <% end %>
    <%= f.action :submit , label: t('Some Text'), button_html: { class: 'btn btn-primary' } %>
<% end %>

Have you considered using form_tags? this will not be bounded to any object, so it won't show it. then, you can then manually bind the params to the object in your update method of the controller. — x6iae
– x6iae, Commented Dec 20, 2015 at 6:31

Joeman29 · Accepted Answer · 2015-12-20 07:55:32Z

1

You can manually set the default value of a field to an empty string by changing this line:

<%= q.input :content, label: "A Thing: #{q.object.content}" %>

To this:

<%= q.input :content, label: "A Thing: #{q.object.content}", input_html: {value:''} %>

You would also need to filter out blank fields on the backend within the update controller method. Something like this:

def update
  filtered_params = permitted_record_params
  filtered_params.keep_if{|k,v| !v.blank? }
  record.update(filtered_params)
  ...
end

Where of course the permitted_record_params method returns your permitted params hash.

edited Dec 20, 2015 at 7:55

answered Dec 20, 2015 at 7:50

Joeman29

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1 Comment

stackQA Over a year ago

Thanks Joeman29. Your suggestion helped get me over the line. I had to modify it a bit, and use byebug to see what was happening, but your answer helped a lot.

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