Elixir 订单搜索结果

我最近在我的应用程序中添加了搜索书籍功能。现在，我想添加一个排序功能，但我很难做到这一点。我想要达到的目标： 当我不搜索任何书籍标题时，我希望能够根据书籍/索引上的价格或标题对书籍进行排序。但是，如果我使用搜索功能，我希望能够按价格或标题对找到的书籍进行排序。有人可以帮助我或指导我如何做，并结合我目前的代码吗？我附上我当前的搜索代码，以及我为排序功能提供的表单

搜索栏位于layout/app.html.eex中

book/index.html.eex-顶部的排序表单

<%= f = form_for @conn, book_path(@conn, :index), [method: :get, as: "order_and_filter"], fn f-> %>
  <% options = ["Order by": "", "Title": "title_asc", "Title (Desc)": "title_desc",
                "Price": "price_asc", "Price (Desc)": "price_desc"] %>
  <%= select f, :order_by, options, class: "tag-select tag-select-sm" %>
  <%= submit "Sort" %>
<% end %>
</form>
<div class="grid sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-5 gap-x-10 gap-y-10 p-6 ">
  <%= for book <- @books do %>
    <%= link to: Routes.book_path(@conn, :show, book) do %>
    <div
      class="flex flex-col justify-between w-60 sm:w-60 h-80 bg-white bg-center text-gray-800 shadow-md overflow-hidden cursor-pointer rounded-md"
      style='background-image: url("<%= book_img_without_img_tag(book, :thumbnail) %>"); background-repeat: no-repeat; background-size: 100% 100%;'>
      <div class="flex justify-between items-center ml-4 pr-8">
      </div>
      <div class="bg-white bg-opacity-95 shadow-md rounded-r-xl p-4 flex flex-col mr-4 mb-8">
        <h3 class="truncate text-s font-bold pb-2"><%= book.title %></h3>
        <p class="truncate text-gray-500 text-sm"><%= full_name(book.author) %></p>
        <div class="flex justify-between items-center">
          <span class="text-gray-400 text-xs">£<%= book.original_price %></span>
        </div>
      </div>
    </div>
    <% end %>
  <% end %>
</div>

存货清单

  def list_books(params) do
    search_term = get_in(params, ["query"])

    Book
    |> Book.search(search_term)
    |> preload(:category)
    |> preload(:author)
    |> Repo.all()
  end

---

我认为当模式匹配对您有所帮助时，情况就是这样。 我建议您在下面添加代码，以匹配空字符串的大小写和排序，如果搜索中有一些值，如果我理解正确，请不要排序

  def search(query, "") do # change there
    wildcard_search = "%#{""}%"

    from(b in query,
      join: a in assoc(b, :author),
      where: fragment("? % ?", b.title, ^wildcard_search),
      or_where: ilike(b.description, ^wildcard_search),
      or_where: ilike(a.last_name, ^wildcard_search),
      or_where: ilike(a.first_name, ^wildcard_search),
      order_by: fragment("similarity(?, ?) DESC", b.title, ^wildcard_search)
    )
  end
  def search(query, search_term) do
    wildcard_search = "%#{search_term}%"

    from(b in query,
      join: a in assoc(b, :author),
      where: fragment("? % ?", b.title, ^wildcard_search),
      or_where: ilike(b.description, ^wildcard_search),
      or_where: ilike(a.last_name, ^wildcard_search),
      or_where: ilike(a.first_name, ^wildcard_search)
      # removed order by here
    )
  end

---

您好，谢谢您的回复和建议。但是，我不知道如何编写排序功能。我的意思是有两种情况。首先，当我进入索引页面时，我想按价格/标题对图书目录/asc进行排序。其次，在我搜索一本书并显示所有匹配的结果后，我想按价格/标题对结果desc/asc进行排序。

  def search(query, "") do # change there
    wildcard_search = "%#{""}%"

    from(b in query,
      join: a in assoc(b, :author),
      where: fragment("? % ?", b.title, ^wildcard_search),
      or_where: ilike(b.description, ^wildcard_search),
      or_where: ilike(a.last_name, ^wildcard_search),
      or_where: ilike(a.first_name, ^wildcard_search),
      order_by: fragment("similarity(?, ?) DESC", b.title, ^wildcard_search)
    )
  end
  def search(query, search_term) do
    wildcard_search = "%#{search_term}%"

    from(b in query,
      join: a in assoc(b, :author),
      where: fragment("? % ?", b.title, ^wildcard_search),
      or_where: ilike(b.description, ^wildcard_search),
      or_where: ilike(a.last_name, ^wildcard_search),
      or_where: ilike(a.first_name, ^wildcard_search)
      # removed order by here
    )
  end