link_toの他のコントロラーのshowアクションへの飛ばし方がわかりません

Question

line_items/_line_items.html.erbの８行目である
<%= link_to image_tag(line_item.information.image_url(:thumb)) %>によってinformation/show.html.erbに飛ばしたいです

carts/show.html.erbが

<div class ="keep-shopping pv1 mt4 has-text-right">
  <%= link_to 'Keep looking', information_path, class: 'button is-warning' %>
</div>
<hr/>

<section class='section'>
  <%= render(@cart.line_items) %>
  
 
  
  <div class="columns">
    <div class="column">
      <%= button_to 'Empty Cart', @cart , method: :delete, data: {confirm: "Are you sure? " },class: "button is-danger" %>
    </div>
    
    <div class="column total has-text-right">
      
    </div>
  </div>
</section>
```line_items/_line_items.html.erbが
```ruby
<div class="columns align-items-center">
  <div class="column is-1">
    <%= line_item.quantity %>
  </div>
  
  <div class="column is-2">
     <figure class="is-128x128 image">
       <%#= image_tag(line_item.information.image_url(:thumb)) %>
        <%= link_to image_tag(line_item.information.image_url(:thumb)) %>
      </figure>
  </div>
  <div class="column is-9">
    <strong><%= line_item.information.title %></strong>
    <div class="columns align-items-center">
      <div class="content column is-9">
        <%= truncate(line_item.information.description, length: 140) %>
      </div>
      
      
    </div>
  </div>
</div>

<div class="has-text-right">
  <%= link_to 'Remove Item', line_item, method: :delete, data: { confirm:" Are you sure? "}, class: "button is-small mb-4" %>
</div>

<hr/ >

carts_controllerが

class CartsController < ApplicationController
   rescue_from ActiveRecord::RecordNotFound, with: :invalid_cart
  before_action :set_cart, only: [:show, :edit, :update, :destroy]

  # GET /carts
  # GET /carts.json
  def index
    @carts = Cart.all
  end

  # GET /carts/1
  # GET /carts/1.json
  def show
    @information = Information.find(params[:id])
  end

  # GET /carts/new
  def new
    @cart = Cart.new
  end

  # GET /carts/1/edit
  def edit
  end

  # POST /carts
  # POST /carts.json
  def create
    @cart = Cart.new(cart_params)

    respond_to do |format|
      if @cart.save
        format.html { redirect_to @cart, notice: 'Cart was successfully created.' }
        format.json { render :show, status: :created, location: @cart }
      else
        format.html { render :new }
        format.json { render json: @cart.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /carts/1
  # PATCH/PUT /carts/1.json
  def update
    respond_to do |format|
      if @cart.update(cart_params)
        format.html { redirect_to @cart, notice: 'Cart was successfully updated.' }
        format.json { render :show, status: :ok, location: @cart }
      else
        format.html { render :edit }
        format.json { render json: @cart.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /carts/1
  # DELETE /carts/1.json
  def destroy
    @cart.destroy if @cart.id == session[:cart_id]
    session[:cart_id] = nil
    respond_to do |format|
      format.html { redirect_to root_path, notice: 'Cart was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_cart
      @cart = Cart.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def cart_params
      params.fetch(:cart, {})
    end
    
    def invalid_cart
      logger.error "Attempt to access invalid cart #{params[:id]}"
      redirect_to root_path, notice: "That cart doesn't exist"
    end

end
```です

やったこと
<%= link_to image_tag(line_item.information.image_url(:thumb)),inforamtion_path(@information) %>としたところcartのidが２であったらinformationのidが２のところに飛んでしまいます

おそらくcontrollerで@information = Information.find(params[:id])とありparams[:id]の部分がcart_idと勘違いされているのかと思います。そこで@information = Information.find(params[:information_id])としてもダメでした。

どうしたらinformationのshowに飛ばせるのでしょうか？
教えてください！

Answer 1

information/show.html.erbへのPathがinformation_pathであれば（rails routes を実行してみて確認してください）、

<%= link_to information_path(line_item.information), image_tag(line_item.information.image_url(:thumb)) %>

を行うと、information_path ってPath名に与えられたControllerのメソッドが実行されます。
そして、引数がline_item.informationであると、line_itemに紐づいたinformationのIDが渡ります。

Comments

[c.koki]

できました、丁寧に回答ありがとうございます！

Answer 2

GET /carts/1

GET /carts/1.json

def show
@information = Information.find(params[:id])
end

まず、このアクションに違和感があります。
route.rb見ないと断定はできませんが、十中八九この場合のparams[:id]はCartのidです。

ヤマカンですが

<%= link_to image_tag(line_item.information.image_url(:thumb)),
            inforamtion_path(line_item.information) %>

Comments

[c.koki]

できました、丁寧に回答ありがとうございます！