ruby-on-rails - 如何在 Rails 中对来自 API 的传入值进行排序

Question

我对 Rails 和 API 还是很陌生。我正在尝试使用 sort_by 对来自 API 的传入值进行排序，但我无法真正弄清楚为什么不起作用。

如您所见，@results 在我的案例列表中包含一组对象。当我单击 params [:sort] 的下拉按钮时，例如价格，我似乎失去了我的 params 列表，所以然后@results 在一个空数组中。

如果有人可以提供帮助，我不确定如何解决此问题，我将不胜感激。

Listings_controller

class ListingsController < ApplicationController
  require 'will_paginate/array'

  def index
    listings = params[:listings]
    beds = params[:beds]
    baths = params[:baths]
    min_price = params[:min_price]
    max_price = params[:max_price]
    sub_type = params[:sub_type]
    min_area = params[:min_area]
    max_area = params[:max_area]
    residential = params[:residential]
    rental = params[:rental]
    multifamily = params[:multifamily]
    condominium = params[:condominium]
    garage_spaces = params[:garage]

    search_options = [ beds, baths, min_price, max_price, sub_type, min_area, max_area, residential, rental, multifamily, condominium, garage_spaces ]

    if params[:sort] == 'price'
      @results = Listing.find_listings(listings).sort_by { |listing| listing.price }
    elsif params[:sort] == 'date'
      @results = Listing.find_listings(listings).sort_by { |listing| listing.list_date }
    elsif params[:sort] == 'beds'
      @results = Listing.find_listings(listings).sort_by { |listing| listing.beds }
    elsif params[:sort] == 'sqft'
      @results = Listing.find_listings(listings).sort_by { |listing| listing.area }
    elsif search_options.any? { |option| option.present? }
      @results = Listing.find_listings_wo_subtype(listings, beds, baths, min_price, max_price, residential, rental, multifamily, condominium, sub_type, min_area, max_area, garage_spaces).paginate(page: params[:page], per_page: 20)
    else
      @results = Listing.find_listings(listings).paginate(page: params[:page], per_page: 20)
    end
  end

_listing_card.html.erb

<div class="container">
  <div class="dropdown">
    <button class="btn btn-info dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Sort by:
      <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton">
      <li><%= link_to 'Price', listings_path(sort: 'price') %></li>
      <li><%= link_to 'Listing Date', listings_path(sort: 'date') %></li>
      <li><%= link_to 'Beds', listings_path(sort: 'beds') %></li>
      <li><%= link_to 'SQFT', listings_path(sort: 'sqft') %></li>
    </ul>
  </div>
</div>


<% @results.each do |listing| %>
  <div class="item">
    <div class="card-image">
      <% if listing.listing_images.present? %>
        <%= link_to image_tag(listing.listing_images[0], class: 'listing-photo'), listing_path(listing.mls_id) %>
      <% else %>
        <%= link_to image_tag('Image_not_available.png', class: 'listing-photo'), listing_path(listing.mls_id) %>
      <% end %>
    </div>
    <ul class="card-details">
      <li class="list-unstyled price"><%= number_to_currency(listing.price, precision: 0) %></li>
      <li class="list-unstyled bold"><%= listing.street_number %> <%= listing.street %> <br></li>
      <li class="list-unstyled bold"><%= listing.city %> <%= listing.state %> <%= listing.postal_code %><br></li>
      <li class="list-unstyled bold"><%= listing.beds %> beds | <%= listing.baths_full %> baths | <%= listing.area %> sqft </li>
      <li class="list-unstyled bold"><%= "Listing Date:  #{ format_date(listing.list_date) }"%></li>
    </ul>
  </div>
<% end %>

列表服务.rb

class ListingService

  attr_reader :listings,
              :residential,
              :rental,
              :multifamily,
              :condominium,
              :sub_type,
              :min_price,
              :max_price,
              :min_area,
              :max_area,
              :baths,
              :beds,
              :garage_spaces

  def initialize(listings, beds = '', baths = '', min_price = '', max_price = '', residential = '', rental = '', multifamily = '', condominium = '',
                  sub_type = '', min_area = '', max_area = '', garage_spaces = '' )
    @listings    = listings
    @beds        = beds
    @baths       = baths
    @min_price   = min_price
    @max_price   = max_price
    @residential = residential
    @rental      = rental
    @multifamily = multifamily
    @condominium = condominium
    @sub_type    = sub_type
    @min_area    = min_area
    @max_area    = max_area
    @garage_spaces = garage_spaces

    @conn = Faraday.new(url: "https://api.simplyrets.com") do |faraday|
      faraday.basic_auth(ENV['SIMPLY_RETS_API_KEY'], ENV['SIMPLY_RETS_API_SECRET'])
      faraday.adapter Faraday.default_adapter
    end
  end

  def find_listings
    get_url("/properties?q=#{@listings}&limit=200")
  end

  def get_url(url)
    response = @conn.get(url)
    JSON.parse(response.body, symbolize_names: true)
  end

  def self.find_listings(listings)
    new(listings).find_listings
  end

结尾

清单.rb

class Listing

  attr_reader :beds,
              :baths_full,
              :baths_half,
              :baths,
              :area,
              :street_number,
              :street,
              :city,
              :postal_code,
              :state,
              :price,
              :latitude,
              :longitude,
              :id,
              :mls_id,
              :listing_images,
              :roof,
              :cooling,
              :style,
              :stories,
              :fireplaces,
              :flooring,
              :heating,
              :foundation,
              :laundry_features,
              :lot_description,
              :pool,
              :sub_type,
              :interior_features,
              :lot_size,
              :area_source,
              :maintenance_expense,
              :additional_rooms,
              :exterior_features,
              :water,
              :view,
              :lot_size_area,
              :subdivision,
              :construction,
              :parking,
              :parking_leased,
              :parking_spaces,
              :parking_description,
              :lot_size_area_units,
              :type,
              :garage_spaces,
              :baths_three_quaters,
              :accessiblity,
              :year_built,
              :terms,
              :showing_instructions,
              :schools,
              :middle_school,
              :high_school,
              :elementary_school,
              :tax_year,
              :tax_anual_amount,
              :remarks,
              :association_fee,
              :association_name,
              :association_amenities,
              :list_date


  def initialize(listing)
    @beds            = listing[:property][:bedrooms]
    @baths_full      = listing[:property][:bathsFull]
    @baths_half      = listing[:property][:bathsHalf]
    @baths           = listing[:property][:bathrooms]
    @area            = listing[:property][:area]
    @street          = listing[:address][:streetName]
    @street_number   = listing[:address][:streetNumberText]
    @city            = listing[:address][:city]
    @postal_code     = listing[:address][:postalCode]
    @state           = listing[:address][:state]
    @price           = listing[:listPrice]
    @latitude        = listing[:geo][:lat]
    @longitude       = listing[:geo][:lng]
    @id              = listing[:listingId]
    @mls_id          = listing[:mlsId]
    @list_date       = listing[:listDate]


    # for property details
    @listing_images        = listing[:photos]
    @roof                  = listing[:property][:roof]
    @cooling               = listing[:property][:cooling]
    @style                 = listing[:property][:style]
    @stories               = listing[:property][:stories]
    @fireplaces            = listing[:property][:fireplaces]
    @flooring              = listing[:property][:flooring]
    @heating               = listing[:property][:heating]
    @foundation            = listing[:property][:foundation]
    @laundry_features      = listing[:property][:laundryFeatures]
    @lot_description       = listing[:property][:lotDescription]
    @pool                  = listing[:property][:pool]
    @sub_type              = listing[:property][:subType]
    @interior_features     = listing[:property][:interiorFeatures]
    @lot_size              = listing[:property][:lotSize]
    @area_source           = listing[:property][:areaSource]
    @maintenance_expense   = listing[:property][:maintenanceExpense]
    @additional_rooms      = listing[:property][:additionalRooms]
    @exterior_features     = listing[:property][:exteriorFeatures]
    @water                 = listing[:property][:water]
    @view                  = listing[:property][:view]
    @lot_size_area         = listing[:property][:lotSizeArea]
    @subdivision           = listing[:property][:subdivision]
    @construction          = listing[:property][:construction]
    @parking               = listing[:property][:parking]
    @parking_leased        = listing[:property][:parking][:leased]
    @parking_spaces        = listing[:property][:parking][:spaces]
    @parking_description   = listing[:property][:parking][:description]
    @lot_size_area_units   = listing[:property][:lotSizeAreaUnits]
    @type                  = listing[:property][:type]
    @garage_spaces         = listing[:property][:garageSpaces]
    @baths_three_quaters   = listing[:property][:bathsThreeQuarter]
    @accessiblity          = listing[:property][:accessibility]
    @year_built            = listing[:property][:yearBuilt]
    @terms                 = listing[:property][:terms]
    @showing_instructions  = listing[:property][:showingInstructions]
    @schools               = listing[:school]
    @middle_school         = listing[:school][:middleSchool]
    @high_school           = listing[:school][:highSchool]
    @elementary_school     = listing[:school][:elementarySchool]
    @tax_year              = listing[:tax][:taxYear]
    @tax_anual_amount      = listing[:tax][:taxAnualAmount]
    @remarks               = listing[:property][:remarks]
    @association_fee       = listing[:association][:fee]
    @association_name      = listing[:association][:name]
    @association_amenities = listing[:association][:amenities]
  end


  def self.find_listings(listings)
    listings = ListingService.find_listings(listings)
    listings.map do |listing|
      new(listing)
    end
  end
end

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