Rails如何在跨模型系統中傳遞參數

我無法找出將params傳遞給鏈接標記的方法。我想要做的是當有人點擊加入組鏈接時，會員模型應該有一個新的行，其group_id作爲當前組ID，用戶ID作爲當前用戶ID。成員資格模型目前由兩列組成：user_id和group_id將用戶映射到組。任何人都可以幫我解決我犯的錯誤。下面是代碼組：show.html.erbRails如何在跨模型系統中傳遞參數

<p id="notice"><%= notice %></p> 

<p> 
    <strong>Title:</strong> 
    <%= @group.title %> 
</p> 

<p> 
    <strong>Desc:</strong> 
    <%= @group.desc %> 
</p> 

<p> 
    <strong>Creator:</strong> 
    <%= @creator.first_name %> 
</p> 
<%= link_to 'Join Group', memberships_path(:group_id => @group.id, :user_id => current_user.id), method: :post %> 
<%= link_to 'Edit', edit_group_path(@group) %> | 
<%= link_to 'Back', groups_path %>

這裏是成員控制器

class MembershipsController < ApplicationController 
    before_action :set_membership, only: [:show, :edit, :update, :destroy] 

    # GET /memberships 
    # GET /memberships.json 
    def index 
    @memberships = Membership.all 
    end 

    # GET /memberships/1 
    # GET /memberships/1.json 
    def show 
    @membership = Membership.find(params[:id]) 
    @user = User.find(@membership.user_id) 
    @group = Group.find(@membership.group_id) 
    end 

    # GET /memberships/new 
    def new 
    @membership = Membership.new 
    end 

    # GET /memberships/1/edit 
    def edit 
    end 

    # POST /memberships 
    # POST /memberships.json 
    def create 
    @membership = Membership.new(membership_params) 

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

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

    # DELETE /memberships/1 
    # DELETE /memberships/1.json 
    def destroy 
    @membership.destroy 
    respond_to do |format| 
     format.html { redirect_to memberships_url, notice: 'Membership was successfully destroyed.' } 
     format.json { head :no_content } 
    end 
    end 

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

    # Never trust parameters from the scary internet, only allow the white list through. 
    def membership_params 
     params.require(:membership).permit(:user_id, :group_id) 
    end 
end

來源

2015-05-31 Aayush Aarwal

你應該在你的控制器的方法，處理將用戶添加到組，是這樣的：

class MembershipsController < ApplicationController 

    ... 

    def join_group 
     @user = User.find(params[:user] 
     @user.group_id = params[:group_id].to_i 
    end 

    ... 

end

然後routes.rb中需要的是控制方法的路徑：

get 'memberships/join_group' => 'memberships#join_group'

這會導致類似memberships_join_group_path，你會在你的link_to使用路徑：

<%= link_to 'Join Group', memberships_join_group_path(:group_id => @group.id, :user_id => current_user.id) %>

您目前使用的路徑發送PARAMS您index方法。

來源

2015-05-31 20:04:06 MarsAtomic

但這不能將其存放於會員數據庫。 –

這不是你要解決的問題嗎？你說你的問題是通過link_to傳遞params，我回答了。如果你不能在你的join_group方法中提出邏輯，這是一個單獨的問題。 – MarsAtomic

對不起，我對rails比較陌生。我試圖def join_group @user = User.find（current_user.id） Membership.new（user_id：current_user.id，group_id：@group.id） Membership.save end –

嘗試

def create 

    @member = current_user.members.build(:group_id => params[:group_id]) 
    if @member.save 
     flash[:notice] = "You have joined this group." 
     redirect_to members_path 
    else 
     flash[:error] = "Unable to join." 
     redirect_to members_path 
    end 
    end

和會員使用，而不是成員

來源

2015-10-29 09:41:57 DrestZ

Rails如何在跨模型系統中傳遞參數

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