鏈接和參數

Question

我正在嘗試獲取一系列工作鏈接。有些應該是可切換的，有些則不可以。

基本上在頁面刷新我的PARAMES散列已經有兩個鍵，它不應該有，我不能看到他們在哪裏被添加。

我的鏈接：

<ul class="all filter__group"> 
    <li><%= link_to "View all", coasters_path(page: 1), remote: true %></li> 
</ul> 

<ul class="types filter__group"> 
    <%= content_tag(:li, class: ("active" if params[:type] == "steel")) do %> 
    <%= link_to "Steel", coasters_path(type_parameters("steel", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:type] == "wood")) do %> 
    <%= link_to "Wood", coasters_path(type_parameters("wood", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:type] == "powered")) do %> 
    <%= link_to "Powered", coasters_path(type_parameters("powered", page: 1)), remote: true %> 
    <% end %> 
</ul> 

<ul class="letters filter__group"> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "#")) do %> 
    <%= link_to "#", coasters_path(letter_parameters("#", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "a-e")) do %> 
    <%= link_to "A-E", coasters_path(letter_parameters("a-e", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "f-j")) do %> 
    <%= link_to "F-J", coasters_path(letter_parameters("f-j", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "k-o")) do %> 
    <%= link_to "K-O", coasters_path(letter_parameters("k-o", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "p-t")) do %> 
    <%= link_to "P-T", coasters_path(letter_parameters("p-t", page: 1)), remote: true %> 
    <% end %> 
    <%= content_tag(:li, class: ("active" if params[:letters] == "u-z")) do %> 
    <%= link_to "U-Z", coasters_path(letter_parameters("u-z", page: 1)), remote: true %> 
    <% end %> 
</ul> 
<%= debug params %> 

的輔助方法：

# Add the type parameter to URL if not already there and remove if they are 
    def type_parameters(type, options = {}) 
    parameters = {} 
    if params[:type] == type 
     # Get exisiting params 
     parameters = params 
     # Remove type 
     parameters.delete(:type) 
     # Merge any parameters passed in via options 
     parameters.merge!(options) 
    else 
     # Get exisiting params 
     parameters = params 
     #Add type to new parameters variable 
     parameters.merge!(type: type) 
     # Merge any parameters passed in via options 
     parameters.merge!(options) 
    end 
    parameters 
    end 

    # Add the letters parameter to URL if not already there and remove if they are 
    def letter_parameters(letters, options = {}) 
    parameters = {} 
    if params[:letters] == letters 
     # Get exisiting params 
     parameters = params 
     # Remove letters 
     parameters.delete(:letters) 
     # Merge any parameters passed in via options 
     parameters.merge!(options) 
    else 
     # Get exisiting params 
     parameters = params 
     #Add letters to new parameters variable 
     parameters.merge!(letters: letters) 
     # Merge any parameters passed in via options 
     parameters.merge!(options) 
    end 
    parameters 
    end 

在一個頁面重新加載，這是當前PARAMS哈希：

--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess 
action: index 
controller: coasters 
type: powered 
page: 1 
letters: u-z 

在哪裏，我錯了任何想法？

Answer 1

您正在覆蓋幫助器中的參數散列：當您使用merge!時，您將覆蓋原始的params散列。

這應該工作：

# Add the letters parameter to URL if not already there and remove if they are 
    def letter_parameters(letters, options = {}) 
    parameters = params.dup 

    if params[:letters] == letters 
     # Remove letters 
     parameters.delete(:letters) 
    else 
     # Add letters to new parameters variable 
     parameters.merge!(letters: letters) 
    end 

    # Merge any parameters passed in via options 
    parameters.merge(options) 
    end 

注意使用dup創建params哈希表