RoR Summation Issue - html

Question

I have a problem with my Ruby application. I created users who are associated with a resource (resource_id). The working hours of the users indicate the capacity of the resource. The resource table should display the total capacity of the resources. The total capacity of the resource results from the sum of the capacities of the users assigned to the respective resource. However, in the resource table, the same capacity is displayed for each resource (the sum of all resources).
As an an example:
I have 2 use, which each work 8 hours:
User 1: capacity 8, resource_id 1
User 1: capacity 8, resource_id 2
Now there should be 2 resources in the resource table, each with a capacity of 8. With me however both resources with a capacity of 16 ..
Here are the corresponding index files, controllers and models.
resources.index
<% provide(:title, 'Ressourcen') %>
<p id="notice"><%= notice %></p>
<h1>Ressourcen</h1>
<table id="resources" class="display">
<thead>
<tr>
<th>Name</th>
<th>Gesamtkapazität</th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<% #resources.each do |resource| %>
<tr>
<td><%= resource.name %></td>
<td><%= User.sum(:capacity, :conditions => {:resource_id => resource}) %></td>
<td><%= link_to 'Anzeigen', resource %></td>
<td><%= link_to 'Entfernen', resource, method: :delete, data: { confirm: 'Sind Sie sich sicher?' } %></td>
<% end %>
</tr>
</tbody>
</table>
resource.model:
class Resource < ActiveRecord::Base
def resource_params
params.require(:resource).permit(:created_at, :name, :ocr, :cost, :oce)
end
validates :name, presence: true, uniqueness: true, length: {maximum: 50}
has_many :procedure_resources, :dependent => :destroy
has_many :procedures, through: :procedure_resources
has_many :users, :dependent => :destroy
end
resource.controller:
class ResourcesController < ApplicationController
before_action :set_resource, only: [:show, :edit, :update, :destroy]
# GET /resources
# GET /resources.json
def index
#resources = Resource.all
#procedures = Procedure.all
#project = Project.find(1)
end
def show
#resource = Resource.find(params[:id])
end
private
def set_resource
#resource = Resource.find(params[:id])
end
def resource_params
params.require(:resource).permit(:name, :oce, :oce, :cost, :ocr)
end
end
users.model:
class User < ActiveRecord::Base
belongs_to :resource
Does anyone know how I managed it, that it only shows the capacity of the respective resource in the resource.index?
The error must be in the resource.index with the following line:
<td> <% = User.sum (: capacity,: conditions => {: resource_id => resource})%> </ td>
or?
Best regards,
Phillip