我正在制作一个用户可以加入和取消加入活动的项目。我得到了连接功能，除了在视图页面中，当我为它编写逻辑时：“if @joins.count＆gt; 0 ...然后显示”Joined / Unjoin“，否则，显示”Join“..当我点击Join时，它会影响到每一行，而不仅仅是我想要加入的特定事件。而且它不会像那样进入数据库。因为当我点击一个事件时它只会显示计数增加了我加入的1，即使在主索引页面上看起来好像这个特定用户已加入/取消加入所有事件......这是我的代码。我该怎么做才能纠正这个
events_controller.rb
class EventsController < ApplicationController
before_action :require_login, except: [:new, :create, :show, :edit, :update, :delete]
before_action :require_correct_user, only: [:edit, :update, :delete]
def index
@events = Event.all
@user = current_user
@joins = Join.where(user:@user)
end
def create
user = User.find(current_user.id)
user.events.create(name: params[:name], timing: params[:timing], location: params[:location], state: params[:state])
redirect_to "/events"
end
def show
@event = Event.find(params[:id])
@comments = @event.comments
@joins = Join.where(event:@event, user: current_user)
end
def delete
event = Event.find(params[:id])
event.destroy
redirect_to "/events"
end
def edit
@event = Event.find(params[:id])
end
def update
event = Event.find(params[:id])
event.update(name: params[:name], location: params[:location], timing: params[:timing], state: params[:state])
redirect_to "/events"
end
def join
event = Event.find(params[:id])
user = User.find(current_user)
Join.create(user:user, event:event)
redirect_to "/events"
end
def unjoin
event = Event.find(params[:id])
user = current_user
Join.find_by(user: user, event: event).destroy
redirect_to "/events"
end
end
index.html.erb
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<% if current_user %>
<form action='/sessions' method='post'>
<input type='hidden' name='authenticity_token' value='<%= form_authenticity_token %>'>
<input type='hidden' name='_method' value='delete'>
<input type='submit' value='Log Out'>
</form>
<% end %>
<a href="/users/<%=current_user.id%>">Edit Profile</a>
<hr>
<h3>Welcome, <%=current_user.first_name%> <%= current_user.last_name %></h3>
<hr>
<h4>Here are some of the events in your state:</h4>
<table class="table class table-bordered table-striped table-hovered table- hover">
<thead>
<tr>
<th>Name</th>
<th>Date</th>
<th>Location</th>
<th>State</th>
<th>Host</th>
<th>Action/Status</th>
</tr>
</thead>
<tbody>
<% @events.each do |e| %>
<% if e.state==c urrent_user.state %>
<td>
<a href="/events/<%=e.id %>">
<%=e.name %>
</td>
<td>
<%=e.timing%>
</td>
<td>
<%=e.location%>
</td>
<td>
<%=e .state %>
</td>
<td>
<%=e.user.first_name%>
</td>
<% if e.state==c urrent_user.state and e.user.id==c urrent_user.id %>
<td><a href="/events/<%=e.id%>/edit">Edit</a>
<form action="/events/<%=e.id%>" method="post">
<input type="hidden" name="_method" value="delete">
<input type="hidden" name="authenticity_token" value=" <%=form_authenticity_token%>">
<input type="submit" value="Delete">
</form>
</td>
<% elsif e.state==c urrent_user.state and @joins.count> 0 %>
<td>Joined |
<form action="/joins/<%=e.id%>" method="post">
<input type="hidden" name="_method" value="delete">
<input type="hidden" name="authenticity_token" value=" <%=form_authenticity_token%>">
<input type="submit" value="Cancel">
</form>
</td>
<% elsif @joins.count==0 and e.state==c urrent_user.state %>
<td>
<form action="/joins/<%=e.id%>" method="post">
<input type="hidden" name="authenticity_token" value="<%=form_authenticity_token%>">
<input type="hidden" name="id" value="<%=e.id%>">
<input type="submit" value="Join">
</form>
</td>
<% end %>
</tr>
<% end %>
<% end %>
</tbody>
</table>
<hr>
<h4>Here are some of the events in other states:</h4>
<table class="table class table-bordered table-striped table-hovered table-hover">
<thead>
<tr>
<th>Name</th>
<th>Date</th>
<th>Location</th>
<th>State</th>
<th>Host</th>
<th>Action/Status</th>
</tr>
</thead>
<tbody>
<% @events.each do |e| %>
<tr>
<% if e.state !=c urrent_user.state %>
<td>
<a href="/events/<%=e.id %>">
<%=e.name %>
</td>
<td>
<%=e.timing%>
</td>
<td>
<%=e.location%>
</td>
<td>
<%=e .state %>
</td>
<td>
<%=e.user.first_name%>
</td>
<% if e.user.id==c urrent_user.id %>
<td><a href="/events/<%=e.id%>/edit">Edit</a> |
<form action="/events/<%=e.id%>" method="post">
<input type="hidden" name="_method" value="delete">
<input type="hidden" name="authenticity_token" value=" <%=form_authenticity_token%>">
<input type="submit" value="Delete">
</form>
</td>
<% elsif @joins.count> 0 %>
<td>Joined |
<form action="/joins/<%=e.id%>" method="post">
<input type="hidden" name="_method" value="delete">
<input type="hidden" name="authenticity_token" value="<%=form_authenticity_token%>">
<input type="submit" value="Cancel">
</form>
</td>
<% elsif @joins.count==0 %>
<td>
<form action="/joins/<%=e.id%>" method="post">
<input type="hidden" name="authenticity_token" value="<%=form_authenticity_token%>">
<input type="submit" value="Join">
</form>
</td>
<% end %>
<% end %>
</tr>
<% end %>
</tbody>
</table>
<hr>
<h4>Add Event:</h4>
<form action="/events" method="post">
<input type="hidden" name="id" value="<%=current_user.id%>">
<input type="hidden" name="authenticity_token" value=" <%=form_authenticity_token%>"> Name:
<input type="text" name="name">
<br> Date:
<input type="date" name="timing">
<br> Location:
<input type="text" name="location">
<select name="state" id="">
<option value="<%=current_user.state%>">
<%=current_user.state%>
</option>
<% if current_user.state=="CA" %>
<option value="WA">WA</option>
<option value="AZ">AZ</option>
<% elsif current_user.state=="WA" %>
<option value="CA">CA</option>
<option value="AZ">AZ</option>
<% elsif current_user.state=="AZ" %>
<option value="WA">WA</option>
<option value="CA">CA</option>
<% end %>
</select>
<input type="submit" value="Add Event">
</form>
</div>
</body>
</html>