How to retrieve id sent from a link_to in rails - ruby-on-rails

Question

I am trying to to edit a form through a reveal-modal. So i have multiple posts.
When I click the link 'Edit' it will reveal a div and display a form inside that is repopulated with the information. However, I don't know how to pass the post id into the form it will know which post to edit.
If i try to render the partial form I get this error:
undefined method `model_name' for Post::ActiveRecord_Relation:Class
All my information are on a controller view that is called Dashboard
controllers/dashboards_controller.rb
class DashboardsController < ApplicationController
def index
#profile = Profile.find(current_user)
#profileAll = Profile.all
#post = Post.all
end
def show
end
def edit
#profile =Profile.find(current_user)
#post = #profile.post.find(params[:id])
end
end
controllers/posts_controller.rb
class PostsController < ApplicationController
def create
#profile = Profile.find(current_user)
#post = #profile.post.create(post_params)
redirect_to dashboards_path(current_user)
end
def destroy
#post =Profile.find(params[:profile_id])
#post = profile.post.find(params[:id])
#post.destroy
redirect_to dashboards_path(current_user)
end
def show
#profile =Profile.find(current_user)
#post = #profile.post.find(params[:id])
end
def edit
#profile =Profile.find(current_user)
#post = #profile.post.find(params[:id])
end
def update
#post = profile.post.find(params[:id])
if #post.update(post_params)
redirect_to dashboards_path(current_user)
else
render 'edit'
end
end
private
def post_params
params.require(:post).permit(:title, :content)
end
end
posts/_form2.html.erb
<%= form_for #post do |f| %>
<% if #post.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#post.errors.count, "error") %> prohibited
this post from being saved:</h2>
<ul>
<% #post.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :content %><br>
<%= f.text_area :content %>
</p>
<p>
<%= f.submit %>
</p>
<% end %>
routes.rb
Rails.application.routes.draw do
get 'homepages/index'
resources 'dashboards' do
resources 'posts'
end
#get 'users/sign_in'
resources 'profiles' do
resources 'posts'
end
devise_for :users, :controller => {:registrations => "users/registrations"}
devise_scope :user do
root :to => 'devise/sessions#new'
end
end
Dashboards/index.html.erb
<% #post.each do |post| %>
<div class="panel">
<%= #profileAll.find(post.profile_id).name %>
<hr>
<h5><%= post.title %></h5>
<p><%= post.content %></p>
<%# link_to "Edit", edit_dashboard_post_path(current_user,[post.profile, post]) %>
<%= link_to "Edit", {id: #post},'data-reveal-id' => 'edit-post' %>
</div>
<% end %>
<div id="edit-post" class="reveal-modal" data-reveal>
<%= render 'posts/form2' %>
<a class="close-reveal-modal">×</a>
</div>

Answer 1

Well, it simply does not work that way. First, you have in your controller #post = Post.all and within your _form2.html.erb you want to render form for a collection. That should be:
# index.html.erb
<div id="edit-post" class="reveal-modal" data-reveal>
<%= render :partial => 'posts/form2', collection: #posts %>
<a class="close-reveal-modal">×</a>
</div>
#dashboard controller:
def index
#...
#posts = Post.all
end
_form2.html.erb:
Every #post object instance has to be replaced with form2. Read more here: http://api.rubyonrails.org/classes/ActionView/PartialRenderer.html about rendering a collection.
However, consider a case when you have hundreds of posts. Then, for each post, a partial is rendered. That would be very inefficient so instead, consider an asynchronous request which will load only one post the user requested.