用于更新Rails 4中记录的新表格

Question

I have a Rails 4 app. In this app, I have multiple HABTM relationships between various models. For example, a task can have many learning objectives as well as many missions associated with it. Right now, I have the edit form in modal dialog that edits the task record and is invoked via the edit_task_path(@task) that updates the record. I would like to create a new form that also does that update action; however, I only want this form to be for updating the associations for the tasks. My main question is: how do I create and call a second form to route to the update action for the same record? I would basically like a update_task_path(@task) that handles the update controller action as well. I've looked at various stack overflows and none specifically address a new form for the update controller action.

Answer 1

As you're routing to the same place you don't really need to do anything other than have a seperate form partial. I assume the task would have to be valid at the point you're changing associations, and the associations would be valid (or you don't have anything to validate associated objects) otherwise on failure it would render the main form if that is what you've put in the controller.

# main_form
<%= form_for @task do |f| %>
  <div class="field">
    <%= f.label :name %>
    <%= f.text_field :name %>
  </div>
<% end %>

# mission_and_learning_objective_form
<%= form_for @task do |f| %>
  <div class="field">
    <%= f.collection_check_boxes :mission_ids, Mission.all, :id, :name %>
  </div>

  <div class="field">
    <%= f.collection_check_boxes :learning_objective_ids, LearningObjective.all, :id, :name %>
  </div>
<% end %>

You might consider having a seperate controller just for that though

Routes

resources :task_settings, only: [:edit, :update]

Controller

class TaskSettingsController < ApplicationController
  def edit
    @task = Task.find(params[:id])
  end

  def update
    @task = Task.find(params[:id])
    if @task.update(task_setting_params)
      redirect_to @task, notice: "Settings Updated"
    else
      render :edit
    end
  end

  private

  def task_setting_params
    params.require(:task).permit(mission_ids: [], learning_objective_ids: [])
  end
end

View

# task_settings/edit
<%= form_for @task, url: task_setting_path(@task) do |f| %>
  <div class="field">
    <%= f.collection_check_boxes :mission_ids, Mission.all, :id, :name %>
  </div>

  <div class="field">
    <%= f.collection_check_boxes :learning_objective_ids, LearningObjective.all, :id, :name %>
  </div>
<% end %>

To me having a separate controller is a bit cleaner, especially if you want different behaviour if you're only updating the associations.