Question

A user can input a custom :action or choose a featured :action:

<%= f.text_field :action %>
  Or choose a featured challenge:
<%= f.collection_radio_buttons :action, [['Run a Mile','Run a Mile'], ['Drink 16oz of Water','Drink 16oz of Water'], ['Take a Picture','Take a Picture'], ['1 Drink Max','1 Drink Max'], ['See Eiffel Tower','See Eiffel Tower'], ['Write a Book','Write a Book'], ['Skydive','Skydive'], ['Start a Business','Start a Business'], ['No Snooze','No Snooze'], ['Visit All 50 States','Visit All 50 States'], ['Talk to a Stranger','Talk to a Stranger'], ['Try a New Recipe','Try a New Recipe'], ['Media-fast','Media-fast']], :first, :last %>

If a user chooses a featured :action the new challenges/_form is pre-populated with his chosen :action, but now I'd like to take it to the next level with your help!

<%= form_for(@challenge)  do |f| %>
  Challenge: <%= f.text_field :action %>
  Do On: <%= f.collection_check_boxes :committed %>
  Do For: <%= f.number_field :days_challenged %>
<% end %>

How can I pre-populate the other attributes of a featured challenge like, "Do For" or "Do On"?

For example if a user chose the featured :action: 'Run a Mile then I would pre-populate the form with Run a Mile, Mon, Wed, Fri, 30 Days.

Answer 1

您可以将simple_form与reform一起使用。改革将为您提供表单对象，您可以在其中覆盖将填充表单的方法。

这是一个淡化的例子（你必须根据你的情况进行调整）：

class ChallengeForm < Reform::Form
  property :action
  property :committed
  property :days_challenged

  model :challenge

  def commited
    super || action_to_commited_hash[model.action]
  end

  def days_challenged
    super || action_to_days_challenged_hash[model.action]
  end

  def action_to_days_challenged_hash
    {
      'Run a Mile' => 30,
      'Take a Picture' => 12
    }
  end

  def action_to_commited_hash
    {
      'Run a Mile' => ['Mon', 'Wed', 'Fri'],
      'Take a Picture' => ['Tu', 'Thu']
    }
  end
end

上述方法中的

super将委托给model。请注意，您要覆盖getter方法，并且它不会影响setters（如果您想在编写表单数据之前更改表单数据，也可以覆盖setter）。

在您的模板中，而不是

form_for @challenge

你将拥有：

simple_form_for @form

它是Rails的超级常用表单库，我无法想象自己不使用它！

How to prepopulate _form for featured objects?

1 个答案: