Ruby 函数搜索栏答案

【问题标题】：Ruby function search barRuby 函数搜索栏
【发布时间】：2021-09-19 18:06:03
【问题描述】：

我的搜索栏功能有问题，我希望它通过我的食谱模型属性“成分”进行搜索。当我把这段代码放进去时，搜索后只给我一个空白的食谱页面没有给我任何结果。任何帮助都会很棒。我在配方表中以文本形式提供了成分。

这是在配方 index.html 中

    <%= form_for "", url: recipes_path, role: "search", method: :get do %>
<%= text_field_tag :search, @search_term, placeholder: "Seach..." %>

这是配方控制器

  def index
  @recipes = Recipe.all
  # @recipes =Recipe.search(params[:search])

  if params[:search]
    @search_term = params[:search]
    @recipes = @recipes.search_by(@search_term)
  end

结束

这是食谱模型函数

def self.search_by(search_term)
 where("LOWER(ingredients) LIKE :search_term OR LOWER(title) LIKE :search_term",
 search_term: "%{search_term.downcase}%")
end

这也是我进行搜索时的命令行：

Started GET "/recipes?search=chicken" for 127.0.0.1 at 2021-07-09 07:52:57 -0400
Processing by RecipesController#index as HTML
  Parameters: {"search"=>"chicken"}
  Rendering layout layouts/application.html.erb
  Rendering recipes/index.html.erb within layouts/application
  User Load (0.1ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  [["id", 3], ["LIMIT", 1]]
  ↳ app/views/recipes/index.html.erb:13
  Recipe Load (0.2ms)  SELECT "recipes".* FROM "recipes" WHERE (LOWER(ingredients) LIKE '%{search_term.downcase}%' OR LOWER(title) LIKE '%{search_term.downcase}%')
  ↳ app/views/recipes/index.html.erb:70
  Rendered recipes/index.html.erb within layouts/application (Duration: 5.0ms | Allocations: 2463)
[Webpacker] Everything's up-to-date. Nothing to do
  Rendered layouts/_alerts.html.erb (Duration: 0.1ms | Allocations: 41)
  Rendered layout layouts/application.html.erb (Duration: 11.0ms | Allocations: 7781)
Completed 200 OK in 12ms (Views: 11.1ms | ActiveRecord: 0.3ms | Allocations: 8360)

有谁知道它为什么不搜索食谱成分？提前谢谢你。

【问题讨论】：

应该是：Recipe.search_by，对吧？你可以使用form_tag 或form_with 而不是form_for
我只是使用食谱和 form_tag 更改了模型，但它仍然没有给我任何结果，我想知道为什么它没有渲染任何东西。 form_with 出现错误，所以我不能使用它。

标签： ruby-on-rails ruby search

【解决方案1】：

search_by 方法中的插值错误。
当正确的是"%#{search_term.downcase}%" 时，您写了"%{search_term.downcase}%"。错过了#！

def self.search_by(search_term)
    where("LOWER(ingredients) LIKE :search_term OR LOWER(title) LIKE :search_term",
    search_term: "%#{search_term.downcase}%")
end

【讨论】：