How to override a controller for submitting form - ruby-on-rails

Question

Scenario
I have got four resources in my Rails project, viz. Drive, Drivecomment, College and Manager
resources :drives do
resources :drivecomments
end
devise_for :colleges, controllers: { sessions: "college/sessions", registrations: "college/registrations" }
devise_for :managers, controllers: { sessions: "manager/sessions", registrations: "manager/registrations" }
The association between them are as follows:
Manager => belongs_to :college
College => has_many :managers
College => has_many :drives
Drives => belongs_to :college
Drives => has_many :drivecomments
Drivecomments => belongs_to :drives
As it is clear from above association, each Drive can have multiple Drivecomments, which can be submitted by the Managers.
Also, I have created a custom Controller#View resource "m" for providing a Manager Interface (coz default manager is generated from devise and using the same resource means all post operations get redirected to "create" method, including sign_up, which eventually means i cannot sign_up at all)
resources :m, :only => [:index] do
member do
get :drive
end
end
So, inside my "m", I have created a form for posting a comment as well as a table for displaying all comments.
FOR DISPLAYING COMMENTS:
../drive.html.erb
<h2>Drive Comments</h2>
<table>
<thead>
<tr>
<th>Jobseeker</th>
<th>Comment</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% #comments.each do |comment| %>
<tr>
<td><%= comment.jobseeker.first_name %></td>
<td><%= comment.title %></td>
</tr>
<% end %>
</tbody>
</table>
../m_controller.erb
def drive
#drive = #drives.find_by_id(params[:id])
#comments = #drive.drivecomments
#addcomment = Drivecomment.new
end
FOR ADDING A COMMENT:
../drive.html.erb
<%= form_for [#addcomment], as: :addcomment, url: {action: "addcomment"} do |f| %>
<div><%= f.hidden_field :drive_id, :value => #drive.id %></div>
<div><%= f.hidden_field :jobseeker_id, :value => 2 %></div>
<div><%= f.label "Comment:" %><%= f.text_field :title %></div>
<div><%= f.submit "Post Comment" %></div>
<% end %>
../m_controller.erb
def new
#addcomment = Drivecomment.new
end
def create
#drive = #drives.find_by_id(params[:id])
#addcomment = #drive.drivecomments.build
#addcomment.save
end
Problem
When I submit my form, I get an error saying
ActionController::UrlGenerationError in M#drive
Showing /home/xxx/xxx/xxx/app/views/m/drive.html.erb where line #30 raised:
No route matches {:action=>"addcomment", :controller=>"m", :id=>"5"}
Extracted source (around line #30):
</table>
<%= form_for [#addcomment], as: :addcomment, url: {action: "addcomment"} do |f| %>
<div><%= f.hidden_field :drive_id, :value => #drive.id %></div>
<div><%= f.hidden_field :jobseeker_id, :value => 2 %></div>
Alternatively, If I write my form like this
<%= form_for [#drive, #addcomment] do |f| %>
<div><%= f.hidden_field :drive_id, :value => #drive.id %></div>
<div><%= f.hidden_field :jobseeker_id, :value => 2 %></div>
<div><%= f.label "Comment:" %><%= f.text_field :title %></div>
<div><%= f.submit "Post Comment" %></div>
<% end %>
it submits the form successfully and a value gets added, but I get redirected to "http://localhost:3000/drives/5/drivecomments/8" from "http://localhost:3000/m/5/drive" which I don't want.
Please tell what might be the workaround for this problem.
Additional Info
Drivecomments _form.html.erb
<%= form_for([#drive, #drivecomment]) do |f| %>
<% if #drivecomment.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#drivecomment.errors.count, "error") %> prohibited this drivecomment from being saved:</h2>
<ul>
<% #drivecomment.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :jobseeker_id %><br>
<%= f.number_field :jobseeker_id %>
</div>
<div class="field">
<%= f.label :drive_id %><br>
<%= f.number_field :drive_id %>
</div>
<div class="field">
<%= f.label :title %><br>
<%= f.text_area :title %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
Extract from drivecoments_controller.rb
before_action :set_drivecomment, only: [:show, :edit, :update, :destroy]
before_filter :load_drive
def new
#drivecomment = #drive.drivecomments.new
end
def create
#drivecomment = #drive.drivecomments.new(drivecomment_params)
respond_to do |format|
if #drivecomment.save
format.html { redirect_to [#drive, #drivecomment], notice: 'Drivecomment was successfully created.' }
format.json { render :show, status: :created, location: #drivecomment }
else
format.html { render :new }
format.json { render json: #drivecomment.errors, status: :unprocessable_entity }
end
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_drivecomment
#drivecomment = Drivecomment.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def drivecomment_params
params.require(:drivecomment).permit(:jobseeker_id, :drive_id, :title)
end
def load_drive
#drive = Drive.find(params[:drive_id])
end

Answer 1

If you want to user the action create from the controller m you should define your form like this:
<%= form_for #addcomment, url: url_for(controller: :m, action: :create) do |f| %>
Also, you need to define the create action on your routes, update this piece of your routes:
resources :m, :only => [:index, :create]