在Ruby on Rails 4.2中使用Cocoon gem的嵌套表单

Question

I'm building a web app using Rails 4.2 and I have a model called Strategy which has a has_many relationship to a Tactic model.

To create a view for Strategy, I need to have many nested Tactics on the form. I've been using the Cocoon gem to develop this view.

So far, I've been able to get the form to work properly for the most part but the issue is that I wanted to add a Type attribute to my Tactic model.

For a given strategy, I want to have 3 tactics of one given type, and 2 models of another.

The issue is that rendering my view, all five models are listed sequentially without any room for putting in my own HTML code around them.

Is there a simple way to separate out which of these are rendered? Right now, my view looks as follows...

<%= form_for @strategy do |f| %>
    <div class="strategy">
        <%= f.label :name %>
        <%= f.text_field :name %>
    </div>

    <div class="tactics">
        <%= f.fields_for :tactics do |i| %>
            <%= render 'tactics_fields', f: i %>
        <% end %>
    </div>

    <div class="buttons">
        <%= f.button "Save Strategy", class: 'button' %>
    </div>
<% end %>

If anyone can offer any advice, it would be greatly appreciated.

Answer 1

Are you wanting the form to be rendered so that each Strategy has exactly 5 Tactics listed below it, of which 3 are of one type and 2 are of another?

If so, you can do this in your controller:

5.times do
  tactic = @strategy.tactics.build
  tactic.tactic_type = 'tactic_type'
end

Also, note that using an attribute called type is not a good idea. Use something like tactic_type instead.