undefined method `reply_mailboxer_conversation_path' - ruby-on-rails

Question

When I attempt to render this view:
Reply:
<%= form_for :message, url: [:reply, conversation] do |f| %>
<%= f.text_area :body %>
<%= f.submit "Send Message", class: 'btn btn-primary' %>
<%= submit_tag 'Clear Reply Box', type: :reset, class: 'btn btn-danger' %>
<% end %>
I get the error: undefined method 'reply_mailboxer_conversation_path'
Routes:
resources :messages do
member do
post :new
end
end
resources :conversations do
member do
post :reply
post :trash
post :untrash
end
collection do
get :trashbin
post :empty_trash
end
end
rake routes output:
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) registrations#cancel
user_registration POST /users(.:format) registrations#create
new_user_registration GET /users/sign_up(.:format) registrations#new
edit_user_registration GET /users/edit(.:format) registrations#edit
PATCH /users(.:format) registrations#update
PUT /users(.:format) registrations#update
DELETE /users(.:format) registrations#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
root GET / profiles#index
message POST /messages/:id(.:format) messages#new
messages GET /messages(.:format) messages#index
POST /messages(.:format) messages#create
new_message GET /messages/new(.:format) messages#new
edit_message GET /messages/:id/edit(.:format) messages#edit
GET /messages/:id(.:format) messages#show
PATCH /messages/:id(.:format) messages#update
PUT /messages/:id(.:format) messages#update
DELETE /messages/:id(.:format) messages#destroy
reply_conversation POST /conversations/:id/reply(.:format) conversations#reply
trash_conversation POST /conversations/:id/trash(.:format) conversations#trash
untrash_conversation POST /conversations/:id/untrash(.:format) conversations#untrash
trashbin_conversations GET /conversations/trashbin(.:format) conversations#trashbin
empty_trash_conversations POST /conversations/empty_trash(.:format) conversations#empty_trash
conversations GET /conversations(.:format) conversations#index
POST /conversations(.:format) conversations#create
new_conversation GET /conversations/new(.:format) conversations#new
edit_conversation GET /conversations/:id/edit(.:format) conversations#edit
conversation GET /conversations/:id(.:format) conversations#show
PATCH /conversations/:id(.:format) conversations#update
PUT /conversations/:id(.:format) conversations#update
DELETE /conversations/:id(.:format) conversations#destroy
Really not sure what I'm doing wrong. If I've left out any important code, please just let me know.
https://github.com/portOdin/gfi2/tree/june6/app/views

Answer 1

The error you're receiving is because of how you're defining your form_for block:
<%= form_for :message, url: [:reply, conversation] do |f| %>
From the docs:
Resource-oriented style
In the examples just shown, although not indicated explicitly, we
still need to use the :url option in order to specify where the form
is going to be sent. However, further simplification is possible if
the record passed to form_for is a resource, i.e. it corresponds to a
set of RESTful routes, e.g. defined using the resources method in
config/routes.rb. In this case Rails will simply infer the appropriate
URL from the record itself. For example,
<%= form_for #post do |f| %>
...
<% end %>
is then equivalent to something like:
<%= form_for #post, as: :post, url: post_path(#post), method: :patch, html: { class: "edit_post", id: "edit_post_45" } do |f| %>
...
<% end %>
--
Nested
When you use an array for the resource part of form_for, you're basically telling rails that conversation will inherit from reply.
We use it like this:
<%= form_for [:admin, #object] do |f| %>
This basically treats the url attribute like this:
url: reply_conversation_path
I don't know where it got mailboxer from, but either way, the problem will be caused by the declaration of [:reply, conversation].
--
Fix
There are two ways to fix this.
The first is to use the url: attribute inside the form_for, like this:
<%= form_for [:reply, #conversation], url: reply_conversation_path(conversation) do |f| %>
The second is to use the correct formatting:
<%= form_for #reply, url: reply_conversation_path(#conversation) do |f| %>
...
<% end %>

Answer 2

There are two things that you have to keep in mind whenever you make a form
a. You need to initialise your resource in your controller, in your case reply. I'm assuming you are in show action of conversations controller so you can initialise it like this:
#reply = Message.new # assuming you dont have a reply model and you are using message model as reply
b. The path where you are creating your resource. If you look at your rake routes
reply_conversation POST /conversations/:id/reply(.:format) conversations#reply. You can clearly see that you need to have a conversation to make a reply in that conversation so again you'll have to find that conversation in your show action of conversations controller like this:
#conversation = Conversation.find(params[:id])
Now to make a form is relatively simple
<% form_for #reply, url: reply_conversation_path(#conversation.id) do |f| %>
<%= #your fields %>
<% end %>