Rails:单击下拉选项时提交(通过AJAX)

<%= form_with(model: @post, remote: true) do |form| %>
  <%= form.text_field :title %>
  <%= form.text_area :content %>
  <%= form.submit "Submit" %>
<% end %>

class PostsController< ApplicationController
  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to @post, notice: 'Post was successfully created.' }
        format.js
      else
        format.html { render :new }
        format.js
      end
    end
  end

  private

  def post_params
    params.require(:post).permit(:title, :content)
  end
end

$("#posts").append("<%= j render(@post) %>");