Rails:通过下拉列表和复选框过滤索引
我试图通过下拉菜单(位置)和一组复选框(类别)来过滤产品的索引页,但效果不是很成功。我可以通过下拉菜单过滤位置或类别。我还可以将两个下拉菜单合并到一个表单中,但如果我无法为两个单独的表单提供有效的解决方案。
我想要实现的是提交 onchange 的位置的下拉菜单以及我想要作为带有过滤器按钮的复选框的类别。
我目前的代码提供了下拉列表和复选框,但存在一些问题:
- 视图中都不会返回任何产品
- 复选框列出了所有类别,但是当我根据这些类别进行过滤时,参数将作为数组传递,但每当我过滤时, 类别我丢失了以前的位置选择
这是相关的代码:
产品模型
....
has_many :categorizations
has_many :categories, :through => :categorizations
has_many :localizations
has_many :locations, :through => :localizations
class Product < ActiveRecord::Base
default_scope :order => 'end_date'
scope :not_expired, where('end_date > ?', Time.now)
scope :location, lambda { |*location_id| {:include => :locations, :conditions => ["locations.id = ?", location_id]} }
scope :category, lambda { |*category_id| {:include => :categories, :conditions => ["categories.id = ?", category_id]} }
scope :unique, :group => "title"
控制器
class LibraryController < ApplicationController
def index
if params[:location_id] && params[:category_ids]
@products = Product.not_expired.unique.location(params[:location_id]).category(params[:category_ids]).paginate(:page => params[:page], :per_page => 9)
elsif params[:category_ids]
@products = Product.not_expired.unique.category(params[:category_ids]).paginate(:page => params[:page], :per_page => 9)
elsif params[:location_id]
@products = Product.not_expired.unique.location(params[:location_id]).paginate(:page => params[:page], :per_page => 9)
else
@products = Product.not_expired.unique.paginate(:page => params[:page], :per_page => 9)
end
end
end
库index.html.erb
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<div class="filter_options">
<form class="filter_locations", method="get">
<% @options = Location.all.map { |a| [ a.name, a.id ] } %>
<%= select_tag "location_id", options_for_select(@options), :onchange => "this.form.submit();", :include_blank => true %>
</form>
<form class="filter_categories", method="get">
<% for category in Category.all %>
<%= check_box_tag("[category_ids][]", category.id) %>
<%= category.name %>
<% end %>
<input type="submit" value="Filter" />
</form>
</div>
我一直在绕圈子,所以任何方向都非常感激。
为了部分回答我自己的问题,我修改了库索引,并在类别表单中使用了一个隐藏字段,该字段调用 location_id 参数(如果存在),这意味着我可以保留在选择类别复选框后所做的任何位置选择。
进一步更新是我添加了一个检查,检查是否通过查询参数来检查类别复选框,更新了下面的库index.html.erb。
最后编辑@rdvdijk输入并入(谢谢)
库index.html.erb
.......
<%= form_tag( '', :method => :get ) do %>
<% @options = Location.all.map { |a| [ a.name, a.id ] } %>
<%= select_tag "location_id", options_for_select((@options), params[:location_id]), :onchange => "this.form.submit();", :include_blank => true %>
<% end %>
<%= form_tag( '', :method => :get ) do %>
<% if(params.has_key?(:location_id)) %>
<%= hidden_field_tag 'location_id', params[:location_id] %>
<% end %>
<% Category.all.each do |category| %>
<%= check_box_tag 'category_ids[]', category.id, params[:category_ids].to_s.include?(category.id_to_s) %>
<%= category.name %>
<% end %>
<%= submit_tag 'Filter' %>
<% end %>
.......
I'm trying to filter an index page of products via a dropdown menu (locations) and a set of checkboxes (categories) and not being very successful with it. I can filter via a dropdown for either location or category. I can also combine the two dropdowns within the one form but if I can't get a working solution to two separate forms.
What i'd like to achieve is a dropdown for location that submits onchange and the categories I'd like to have as checkboxes with a filter button.
The code I have at the moment provides the dropdown and checkboxes but there are some problems:
- the checkboxes list all the categories but when I filter based on these the params are passed as an array but no products are returned in the view
- whenever I filter by category i lose the previous location selection
Here's the relevant code:
Product Model
....
has_many :categorizations
has_many :categories, :through => :categorizations
has_many :localizations
has_many :locations, :through => :localizations
class Product < ActiveRecord::Base
default_scope :order => 'end_date'
scope :not_expired, where('end_date > ?', Time.now)
scope :location, lambda { |*location_id| {:include => :locations, :conditions => ["locations.id = ?", location_id]} }
scope :category, lambda { |*category_id| {:include => :categories, :conditions => ["categories.id = ?", category_id]} }
scope :unique, :group => "title"
Controller
class LibraryController < ApplicationController
def index
if params[:location_id] && params[:category_ids]
@products = Product.not_expired.unique.location(params[:location_id]).category(params[:category_ids]).paginate(:page => params[:page], :per_page => 9)
elsif params[:category_ids]
@products = Product.not_expired.unique.category(params[:category_ids]).paginate(:page => params[:page], :per_page => 9)
elsif params[:location_id]
@products = Product.not_expired.unique.location(params[:location_id]).paginate(:page => params[:page], :per_page => 9)
else
@products = Product.not_expired.unique.paginate(:page => params[:page], :per_page => 9)
end
end
end
Library index.html.erb
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<div class="filter_options">
<form class="filter_locations", method="get">
<% @options = Location.all.map { |a| [ a.name, a.id ] } %>
<%= select_tag "location_id", options_for_select(@options), :onchange => "this.form.submit();", :include_blank => true %>
</form>
<form class="filter_categories", method="get">
<% for category in Category.all %>
<%= check_box_tag("[category_ids][]", category.id) %>
<%= category.name %>
<% end %>
<input type="submit" value="Filter" />
</form>
</div>
I've been going around in circles with this so any direction is greatly appreciated.
to part answer my own question I've modified the library index and used a hidden field in the category form that calls for the location_id param, if it exists, which means I can retain any location selection that's been made after selecting category checkboxes.
Further update is I've added a check for whether the category checkbox is checked by querying the params, updated library index.html.erb below.
Last edit with @rdvdijk input incorporated (Thanks)
library index.html.erb
.......
<%= form_tag( '', :method => :get ) do %>
<% @options = Location.all.map { |a| [ a.name, a.id ] } %>
<%= select_tag "location_id", options_for_select((@options), params[:location_id]), :onchange => "this.form.submit();", :include_blank => true %>
<% end %>
<%= form_tag( '', :method => :get ) do %>
<% if(params.has_key?(:location_id)) %>
<%= hidden_field_tag 'location_id', params[:location_id] %>
<% end %>
<% Category.all.each do |category| %>
<%= check_box_tag 'category_ids[]', category.id, params[:category_ids].to_s.include?(category.id_to_s) %>
<%= category.name %>
<% end %>
<%= submit_tag 'Filter' %>
<% end %>
.......
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你有两种形式,我认为这是你问题的一部分。每当您在第一个表单中更改位置时,只有
location_id
才会发送到您的控制器index
操作。每当您选择一个类别并提交第二个表单时,只有category_ids
将发送到您的控制器index
操作。使用一个表单看看会发生什么。它至少应该使过滤适用于单个提交。
我看到的第二个问题是您没有选择所选位置,或检查所选类别。
查看
options_for_select
和
check_box_tag
来解决这个问题。You have two forms, I think that is part of your problem. Whenever you change a location in the first form, only the
location_id
will be sent to your controllerindex
action. Whenever your select a category and submit the second form, only thecategory_ids
will be sent to your controllerindex
action.Use one form and see what happens. It should at least make the filtering work for a single submit.
The second problem I see is that you don't select the chosen location, or check the chosen categories.
Take a look at the documentation for
options_for_select
andcheck_box_tag
to fix that.就我而言,产品belongs_to:category和类别has_many:products,我将categories.id修改为category_id,它有效!
In my case, product belongs_to :category and category has_many :products, I modified categories.id to category_id, it works!