更新实例变量的查询

Question

在一些帮助下，我现在可以将参数传递给控制器​​中的方法。我现在坚持的是如何使用该方法并将其分配给我的实例变量。

class PublicController < ApplicationController

def rehome
  @animals = Animal.animals_rehome.paginate(:page => params[:page], :per_page => 6)
    respond_to do |format|
     format.html
     format.js
    end
 end

def rehomed
  respond_to do |format|
   format.js {render :json => Animal.where(animal_type: params[:animal_type]) }
 end
end

使用以下 ajax 帖子更新参数

$('select.btn').on('change', function() {
  var animal_type = $('#animalType option:selected').text();
  var animal_town = $('#animalTown option:selected').text();

  $.ajax({
   type: 'POST',
   url: '/public/rehomed',
    data: {
     animal_type: animal_type,
   },
    success: function(data) {
     console.log(data);
    }
    });
  });

我想要实现的是在初始页面加载时使用

def rehome
 @animals = Animal.animals_rehome.paginate(:page => params[:page], :per_page => 6)
end

但是当通过选择下拉菜单选择我想要的过滤器时

 def rehome
  @animals = rehomed.paginate(:page => params[:page], :per_page => 6)
 end

但我不确定如何设置。

编辑

我的设置现在看起来像

class PublicController < ApplicationController
 before_filter :default_animal

def rehome
  respond_to do |format|
   format.html
   format.js
  end
end


def rehomed
 conditions = {}
 conditions.merge!(animal_type: params[:animal_type]) if params[:animal_type].present?
 conditions.merge!(rehomed: params[:rehomed]) if params[:rehomed].present?
 conditions.merge!(users: {town: params[:animal_town]}) if params[:animal_town].present?

 @animals = Animal.joins(:user).where(conditions)

  respond_to do |format|
   format.js { render json: @animals }
  end
end


private

def default_animal
  @animals = Animal.animals_rehome.paginate(:page => params[:page], :per_page => 6)
end

end

每次下拉列表在视图中更新时，我的 ajax 请求都会发送正确的参数来构建 @animals 查询，而我想要实现的是将新查询的结果加载到与will_paginate 结构（如果可能的话）。

   $('select.btn').on('change', function() {
    var animal_type = $('#animalType option:selected').text();
    var animal_town = $('#animalTown option:selected').text();
    var data_send = { animal_type: animal_type, animal_town: animal_town, rehomed: false}


   if(animal_type == 'All') {
    data_send = {animal_town: animal_town, rehomed: false}
   }
  if(animal_town == 'All') {
   data_send = {animal_type: animal_type, rehomed: false}
  }

  $.ajax({
   type: 'POST',
   url: '/public/rehomed',
    data: data_send,
     success: function(data) {
      console.log(data);
     }
  });
 });

查看rehome.html.erb

 <div class="all_animals">
  <%= render @animals %> # this is in a partial called _animal.html.erb
 </div>

 <div id="infinite-scrolling">
   <%= will_paginate @animals %>
 </div>

rehome.js.erb

$('.all_animals').append('<%= j render @animals %>');
 <% if @animals.next_page %>
  $('.pagination').replaceWith('<%= j will_paginate @animals %>');
 <% else %>
  $(window).off('scroll');
  $('.pagination').remove();

Answer 1

你应该使用 before_filter

class PublicController < ApplicationController
  before_filter :filter_method

    def rehome
        respond_to do |format|
         format.html
         format.js
        end
     end

    def rehomed
      respond_to do |format|
       format.js {render :json => @animals.where(animal_type: params[:animal_type]) }
     end

    private
    def filter_method
      @animals = Animal.animals_rehome.paginate(:page => params[:page], :per_page => 6)
    end
end

您需要 params[:page] 和 params[:animal_type] 来执行重新定位的操作

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