ruby on rails - Default object attribute not defaulting for HTML -

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if @challenge.name == 'foo'   @challenge.category = 'habit'   @challenge.days_challenged = 21   @challenge.why = 'bar' else

:days_challenged & :why being set in _form foo not :category.

  <div class="challenge-category">     <input class="date-format-switcher" type="radio" value="goal" name="challenge[category]" id="challenge_category_goal">     <label for="challenge_category_goal">goal</label>      <input class="date-format-switcher" type="radio" value="habit" name="challenge[category]" id="challenge_category_habit">     <label for="challenge_category_habit">habit</label>   </div>   <%= f.number_field :days_challenged, class: 'day-challenge' %>   <%= f.text_area :why %>

i assume purposefully custom-coding radio buttons. selected radio button should have attribute "checked", i.e.

<input class="date-format-switcher" type="radio" value="habit"    name="challenge[category]" id="challenge_category_habit" checked />

to set dynamically:

<%= f.radio_button :category, 'goal', class: 'date-format-switcher' %> <%= f.radio_button :category, 'habit', class: 'date-format-switcher' %>

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