所以我正在为学校建立一个网站，其中包含用户可以创建，更新，编辑等的不同wiki。在我的wiki编辑页面上，我允许高级用户选择将协作者添加或删除到他们拥有的wiki如果他们选择将他们的维基检查为私有，则会创建。
我将此添加/删除协作者功能设计为与AJAX一起使用，以便用户可以与他们选择添加或删除的其他用户来回切换，而无需刷新页面。
在我实现了friendly_id gem之前，我的添加/删除功能工作正常。但是，在实现了friendly_id gem之后，我注意到了一个已经创建的新bug。让我解释..
每当我点击将用户添加为协作者时，事情看起来好像已经有效，我可以在添加和删除之间来回切换。但是，我最初尝试添加的用户没有被添加为协作者，并且在堆栈跟踪中很明显。
这是第一次点击“添加”链接后发生的情况：
Started POST "/wikis/hipsters/collaborators?user_id=3" for 127.0.0.1 at 2015-09-28 17:51:06 -0700
Processing by CollaboratorsController#create as JS
Parameters: {"user_id"=>"3", "wiki_id"=>"hipsters"}
Wiki Load (0.2ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."slug" = 'hipsters' ORDER BY "wikis"."id" ASC LIMIT 1
(0.1ms) begin transaction
SQL (0.4ms) INSERT INTO "collaborators" ("created_at", "updated_at", "user_id", "wiki_id") VALUES (?, ?, ?, ?) [["created_at", "2015-09-29 00:51:06.185794"], ["updated_at", "2015-09-29 00:51:06.185794"], ["user_id", 3], ["wiki_id", 0]]
(85.8ms) commit transaction
(0.1ms) begin transaction
(0.1ms) commit transaction
(0.2ms) SELECT COUNT(*) FROM "collaborators" WHERE "collaborators"."wiki_id" = ? [["wiki_id", 51]]
Rendered collaborators/create.js.haml (3.0ms)
Completed 200 OK in 198ms (Views: 106.9ms | ActiveRecord: 86.8ms)
注意如何尝试使用["user_id", 3], ["wiki_id", 0]
user_id是正确的，但wiki_id不是。为什么会这样？ friendly_id gem正在工作，你可以看到这个特定维基的名字是“赶时髦的人”。
这在这里显而易见：
Parameters: {"user_id"=>"3", "wiki_id"=>"hipsters"}
Wiki Load (0.2ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."slug" = 'hipsters' ORDER BY "wikis"."id" ASC LIMIT 1
但是，由于我只是试图将用户“添加”为协作者，现在链接已切换为“删除”，以摆脱协作者。
单击以删除协作者后，我的服务器日志显示以下内容：
Started DELETE "/wikis/51/collaborators/54" for 127.0.0.1 at 2015-09-28 18:02:39 -0700
Processing by CollaboratorsController#destroy as JS
Parameters: {"wiki_id"=>"51", "id"=>"54"}
Wiki Load (0.3ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."slug" = '51' ORDER BY "wikis"."id" ASC LIMIT 1
Wiki Load (0.1ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."id" = ? LIMIT 1 [["id", 51]]
Collaborator Load (0.1ms) SELECT "collaborators".* FROM "collaborators" WHERE "collaborators"."id" = ? LIMIT 1 [["id", 54]]
(0.1ms) begin transaction
SQL (0.4ms) DELETE FROM "collaborators" WHERE "collaborators"."id" = ? [["id", 54]]
(30.1ms) commit transaction
(0.2ms) SELECT COUNT(*) FROM "collaborators" WHERE "collaborators"."wiki_id" = ? [["wiki_id", 51]]
Rendered collaborators/destroy.js.haml (2.0ms)
Completed 200 OK in 52ms (Views: 16.1ms | ActiveRecord: 31.3ms)
然后，当我切换为再次将用户添加为协作者时，这次他们实际上已添加。
服务器日志：
Started POST "/wikis/51/collaborators?user_id=3" for 127.0.0.1 at 2015-09-28 18:05:59 -0700
Processing by CollaboratorsController#create as JS
Parameters: {"user_id"=>"3", "wiki_id"=>"51"}
Wiki Load (0.2ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."slug" = '51' ORDER BY "wikis"."id" ASC LIMIT 1
Wiki Load (0.1ms) SELECT "wikis".* FROM "wikis" WHERE "wikis"."id" = ? LIMIT 1 [["id", 51]]
(0.1ms) begin transaction
SQL (0.7ms) INSERT INTO "collaborators" ("created_at", "updated_at", "user_id", "wiki_id") VALUES (?, ?, ?, ?) [["created_at", "2015-09-29 01:05:59.564379"], ["updated_at", "2015-09-29 01:05:59.564379"], ["user_id", 3], ["wiki_id", 51]]
(182.8ms) commit transaction
(0.1ms) begin transaction
(0.1ms) commit transaction
(0.2ms) SELECT COUNT(*) FROM "collaborators" WHERE "collaborators"."wiki_id" = ? [["wiki_id", 51]]
Rendered collaborators/create.js.haml (3.1ms)
Completed 200 OK in 198ms (Views: 8.3ms | ActiveRecord: 184.2ms)
我注意到这次参数读取Parameters: {"user_id"=>"3", "wiki_id"=>"51"}而不是Parameters: {"user_id"=>"3", "wiki_id"=>"hipsters"}
这是为什么？如何才能使此功能正常运行？
以下是一些相关文件：
wikis_controller.rb：
class WikisController < ApplicationController
def index
@wikis = policy_scope(Wiki)
end
def show
@wiki = Wiki.friendly.find(params[:id])
end
def new
@wiki = Wiki.new
authorize @wiki # Example
end
def create
@wiki = Wiki.new(wiki_params)
@wiki.user = current_user
authorize @wiki
if @wiki.save
flash[:notice] = "Wiki was saved."
redirect_to @wiki
else
flash[:error] = "There was an error saving the wiki. Please try again."
render :new
end
end
def edit
@wiki = Wiki.friendly.find(params[:id])
@users = User.all
authorize Wiki, :edit?
end
def update
@wiki = Wiki.friendly.find(params[:id])
authorize @wiki
if @wiki.update_attributes(wiki_params)
flash[:notice] = "Wiki was updated."
redirect_to @wiki
else
flash[:error] = "There was an error saving the wiki. Please try again."
render :edit
end
end
def destroy
@wiki = Wiki.friendly.find(params[:id])
authorize Wiki, :destroy?
if @wiki.destroy
flash[:notice] = "\"#{@wiki.title}\" was deleted successfully."
redirect_to wikis_path
else
flash[:error] = "There was an error deleting the wiki."
render :show
end
end
private
def wiki_params
params.require(:wiki).permit(:title, :body, :private)
end
end
collaborators_controller.rb：
class CollaboratorsController < ApplicationController
def create
@wiki = Wiki.friendly.find(params[:wiki_id])
@collaborator = Collaborator.create(wiki_id: params[:wiki_id], user_id: params[:user_id])
respond_to do |format|
format.html
format.js
end
end
def destroy
@wiki = Wiki.friendly.find(params[:wiki_id])
@collab = Collaborator.find(params[:id])
@user_id = @collab.user_id
@collab.destroy
respond_to do |format|
format.html
format.js
end
end
end
协作者/ create.js.haml：
- if @collaborator.save
$('#'+#{ params[:user_id] }).replaceWith('<a data-method="delete" data-remote="true" href="/wikis/'+#{ @wiki.id }+'/collaborators/'+#{ @collaborator.id }+'" id="#{ @collaborator.user_id }" rel="nofollow">Remove</a>');
$('.js-collaborators-count').html("Currently #{ pluralize(@wiki.collaborators.count, 'collaborator') } on this wiki.");
- else
$('#'+#{ params[:user_id] }).prepend("<div class='alert alert-danger'>#{ flash[:error] = 'Oops something went wrong..' }</div>");
协作者/ destroy.js.haml：
- if @collab.destroyed?
$('#'+#{ @user_id.to_s }).replaceWith('<a data-method="post" data-remote="true" href="/wikis/'+#{ @wiki.id }+'/collaborators?user_id=#{ @user_id }" id="#{ @user_id }" rel="nofollow">Add</a>');
$('.js-collaborators-count').html("Currently #{ pluralize(@wiki.collaborators.count, 'collaborator') } on this wiki.");
- else
$('#'+#{ @user_id.to_s }).prepend("<div class='alert alert-danger'>#{ flash[:error] = 'Oops something went wrong..' }</div>");
维基/ edit.html.haml：
%h1 Edit Wiki
.row
.col-md-8
= form_for @wiki do |f|
.form-group
= f.label :title
= f.text_field :title, class: 'form-control', placeholder: "Enter wiki title"
.form-group
= f.label :body
= f.text_area :body, rows: 8, class: 'form-control', placeholder: "Enter wiki body"
- if current_user.role == 'admin' || (current_user.role == 'premium' && @wiki.user == current_user)
= render 'wikis/form', f: f
- if current_user.role == 'admin' || (@wiki.private == true && @wiki.user == current_user)
.form-group
%h5
Add/Remove Collaborators to the
%em “#{ @wiki.title }”
wiki (Showing all users)
%small
.js-collaborators-count
Currently #{ pluralize(@wiki.collaborators.count, 'collaborator') } on this wiki.
.col-sm-4.text-center.outline
%h6.underline Name
- @users.each do |u|
.border_bottom
= u.name
%br/
.col-sm-4.text-center.outline
%h6.underline Email
- @users.each do |u|
.border_bottom
= u.email
.col-sm-4.text-center.outline
%h6.underline Give Access
- @users.each do |u|
.border_bottom
- if collab = u.collaborators.find_by(wiki_id: @wiki.id)
= link_to "Remove", wiki_collaborator_path(@wiki, collab), method: :delete, remote: true, id: u.id
- else
= link_to "Add", wiki_collaborators_path(@wiki, user_id: u.id), method: :post, remote: true, id: u.id
.form-group
= f.submit "Update", class: 'btn btn-success mt_10'
如果我留下任何文件，你可以在这里查看我在github上的回购：
答案 0 :(得分：0)
弄清楚出了什么问题。在创建动作中的collaborators_controller里面，我不得不改变
@collaborator = Collaborator.create(wiki_id: params[:wiki_id], user_id: params[:user_id])
到
@collaborator = Collaborator.create(wiki_id: @wiki.id, user_id: params[:user_id])
params[:wiki_id]定位于@wiki.id