ruby-on-rails - 尝试将参数传递给 Rails 控制器

Question

我正在尝试将参数传递给我的产品控制器，但它会产生错误。

如果我有以下代码：

def index
  @products = Product.paginate(:page => params[:page], :per_page => 10)
  respond_to do |format|
    format.html # index.html.erb
    format.json { render json: @products }
  end

一切正常。但是当我将其修改为：

def index
  @products = Product.where('model LIKE ?', '%deluxe%').paginate(:page => params[:page], :per_page => 10) if params[:selected_term] != nil
  respond_to do |format|
    format.html # index.html.erb
    format.json { render json: @products }
  end
end

我收到一条错误消息：

The @products variable appears to be empty. Did you forget to pass the collection object for will_paginate?

在我的views/application.html.erb中，我有：

<% filters = ProductsFilter.all %>
<li><%= link_to "Products", "/product"  %></li>
<% if controller_name == 'products' %>
    <div class="btn-group">
      <button class="btn">Viewpoint</button>
      <button class="btn dropdown-toggle" data-toggle="dropdown">
        <span class="caret"></span>
      </button>
      <ul class="dropdown-menu">
        <% filters.each do |filter| %>
            <li><%= link_to filter.term, tweet_path(:selected_term => filter.term)  %></li>
        <% end %>
<% end %>

解决方案：

这解决了问题（可能不是最优雅的解决方案）：

def index
  @products = Product.paginate(:page => params[:page], :per_page => 10)
  if (params[:selected_term]) != nil
    selected_term = params[:selected_term]
    @products = Product.where('Product_text LIKE ?', "%#{selected_term}%").paginate(:page => params[:page], :per_page => 10)
  end