在我的 rails 应用程序中出现 nil class 错误

Question

我正在尝试从我的 rails 应用中的 instagram API 中提取图像，但目前出现错误：

undefined local variable or method 'search'

我的观点

<div class="container">
        <div class="row">
            <% search.each do |instagram| %>
            <%= image_tag instagram.images.low_resolution.url %>
            </div>
            <% end %>
        </div>

我的控制器

  class PagesController < ApplicationController

  def home
    access_token = "hidden"
    client = Instagram.client(access_token: access_token)
    default_search = client.tag_search('travel')
    search_query = client.tag_search(params[:q])

   if params[:q]
        search_query = client.tag_search(params[:q])
        @tag = search_query.present? ? search_query : default_search
    else
      @tag = tag.first.name
      @search = client.tag_recent_media(@tag)
  end

end
  def about
  end
end

Answer 1

search 从未在您的控制器中定义...我认为您的意思是 @tag 因为这是在您的控制器中定义的并且可能意味着您的视图？

尝试将您的视图更改为：

  <div class="container">
    <div class="row">
        <% @tag.each do |instagram| %>
        <%= image_tag instagram.images.low_resolution.url %>
        </div>
        <% end %>
    </div>

Answer 2

试试这个

可见

<div class="container"> 
  <div class="row"> 
    <% @search.each do |instagram| %>
      <%= image_tag instagram.images.low_resolution.url %>
     <% end %>
  </div> 
</div>

在控制器中

class PagesController < ApplicationController
  def home
    access_token = "hidden"
    client = Instagram.client(access_token: access_token)
    default_search = client.tag_search('travel')
    search_query = client.tag_search(params[:q])
    if params[:q]
     search_query = client.tag_search(params[:q])
     @tag = search_query.present? ? search_query : default_search
     @search = client.tag_recent_media(@tag)
    else
      @tag = default_search.first.name
      @search = client.tag_recent_media(@tag)
    end 
  end
end

Answer 3

控制器：

class PagesController < ApplicationController
  def home
    access_token = "token"
    client = Instagram.client(access_token: access_token)
    default_search = client.tag_search('travel')


    if params[:q] 
      search_query = client.tag_search(params[:q])
      @tag = search_query.present? ? search_query : default_search

    else 
      @tag = default_search 
    end

    @tag = @tag.first.name
    @search = client.tag_recent_media(@tag)



  end

  def about
  end

end

在我的 rails 应用程序中出现 nil class 错误

Getting nil class error in my rails app

api

instagram

ruby-on-rails-4

instagram-api