Unable to create posts in rails forum on the topics page - ruby-on-rails

Question

I am new to rails and am trying create a forum. The forum has many topics, topics belong to a forum and have many microposts, and microposts belong to both topics and users. However, no matter what I try, the posts will not be created. Currently when I try to post, I get the routing error "No route matches [GET] "/topics""
My routes.rb file:
resources :users
resources :sessions, only: [:new, :create, :destroy]
resources :microposts, only: [:create, :destroy]
resources :forums, only: [:index, :show]
resources :topics, only: [:show]
_micropost_form.html.erb
<%= form_for(#micropost) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.hidden_field :topic_id, value: #topic.id %>
<%= f.hidden_field :user_id, value: current_user.id %>
<%= f.text_field :summary, placeholder: "One-line summary..." %>
<%= f.text_area :content, placeholder: "Compose a new post..." %>
</div>
<%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>
microposts_controller.rb
class MicropostsController < ApplicationController
before_action :signed_in_user, only: [:create, :destroy]
before_action :correct_user, only: :destroy
def create
##topic = Topic.find_by_id(params[:topic_id])
#micropost = current_user.microposts.build(micropost_params)
if #micropost.save
flash[:success] = "Your solution has been posted!"
redirect_to topic_path(#topic)
else
redirect_to topic_path(#topic)
end
end
def destroy
#micropost.destroy
redirect_to root_url
end
private
def micropost_params
params.require(:micropost).permit(:summary, :content, :user_id)
end
def correct_user
#micropost = current_user.microposts.find_by(id: params[:id])
redirect_to root_url if #micropost.nil?
end
end
As you can see, I commented out the first line in my create function because I've tried posting based on the the micropost's relationship to the topic to no avail. Thanks in advance and let me know if it would help if I posted more code!

Answer 1

In your :topics resource, you didn't defined the index method, that's why you won't be able to get to topic's list or index page. Try to change your route like this:
resources :topics, only: [:index, :show]
or remove only attribute from resources, it will automatically include all your methods by default.
resources :topics
Also if you have relationship between models, you should define nested routes in your routes
file, For example, you can define them like this, you can change them accordingly:
try to change your route file like this:
resources :users
resources :sessions, only: [:new, :create, :destroy]
resources :forums do
resources :topics do
resources :microposts, only: [:new, :create, :destroy]
end
end
In above case, you can access your forums like this:
http://localhost:3000/forums
you can access your topics like this:
http://localhost:3000/forums/id/topics
you can access your microposts like this:
http://localhost:3000/forums/id/topics/id/microposts
If you want to access /microposts directly you have to put it outside any resource.
resources :microposts, only: [:index]
now you will be able to access it:
http://localhost:3000/microposts
Hope it will help. Thanks.