param is missing or the value is empty: incident_datum - ruby-on-rails

Question

I'm new to ruby on rails and I'm having trouble with importing a csv file with data to db. I have been looking around but most of the similar questions on here did not solve this issue.
Problem: param is missing or the value is empty: incident_datum
I understand that this issue is caused by the action controller due to the params.require( but removing it doesn't help because the csv file just gets temporarily uploaded but no data gets extracted from it.
Here are the supporting files =>
Controller:
class IncidentDataController < ApplicationController
before_action :set_incident_datum, only: [:show, :edit, :update, :destroy]
# GET /incident_data
# GET /incident_data.json
def index
#incident_data = IncidentDatum.all
#incident_data_first_20 = IncidentDatum.first(20)
end
def import
IncidentDatum.import(params[:file])
if #IncidentDatum.save
# after import, redirect and let us know the method worked!
redirect_to root_url, notice: "Incident Data Imported!"
else
render :new
end
end
# GET /incident_data/1
# GET /incident_data/1.json
def show
#distinct_number = IncidentDatum.distinct.pluck(:number).sort
end
# GET /incident_data/new
def new
#incident_datum = IncidentDatum.new
end
# GET /incident_data/1/edit
def edit
end
# POST /incident_data
# POST /incident_data.json
def create
#incident_datum = IncidentDatum.new(incident_datum_params)
respond_to do |format|
if #incident_datum.save
format.html { redirect_to #incident_datum, notice: 'Incident datum was successfully created.' }
format.json { render :show, status: :created, location: #incident_datum }
else
format.html { render :new }
format.json { render json: #incident_datum.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /incident_data/1
# PATCH/PUT /incident_data/1.json
def update
respond_to do |format|
if #incident_datum.update(incident_datum_params)
format.html { redirect_to #incident_datum, notice: 'Incident datum was successfully updated.' }
format.json { render :show, status: :ok, location: #incident_datum }
else
format.html { render :edit }
format.json { render json: #incident_datum.errors, status: :unprocessable_entity }
end
end
end
# DELETE /incident_data/1
# DELETE /incident_data/1.json
def destroy
#incident_datum.destroy
respond_to do |format|
format.html { redirect_to incident_data_url, notice: 'Incident datum was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_incident_datum
#incident_datum = IncidentDatum.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def incident_datum_params
params.require(:incident_datum).permit(
:number,
:priority,
:state,
:description,
:short_description1,
:ticket_type,
:task_type,
:opened,
:closed,
:initial_contact,
:configuration_item,
:environment,
:assignment_group,
:reassignment_count,
:department,
:name,
:problem,
:short_description2)
#MG what to do with '.require(:incident_datum)' after params?
end
end
Import:
<div id="import" class="well" style="display:inline-block;width:100%">
<h3 style="margin-top:0px;">Import Data</h3>
<div id="" style="float:left; flex:1;">
<%= form_tag incident_data_path, multipart: true do %>
<%= file_field_tag :file, :style=>'width: 600px;' %>
</div>
<div style="float:right; flex:1;">
<%= submit_tag "Import CSV" %>
</div>
<% end %>
</div>
<a class="btn btn-info" href="/incident_data/">Incident Data</a>
Index.html.erb
<p id="notice"><%= notice %></p>
<h1 style="float:left;">Incident Data</h1><br />
<div class="btn btn-info" style="float:right;">
<%= link_to 'New Incident Datum', new_incident_datum_path%>
</div><br /><br /><br />
<div style="overflow-y:auto;height:600px;">
<%= flash[:notice] %> <!-- Why was this commented out? </th-->
<table class="table table-striped">
<thead>
<tr>
<th>Number</th>
<th>Priority</th>
<th>State</th>
<th>Description</th>
<th>Short description1</th> <!-- Why was this commented out? </th-->
<th>Ticket type</th>
<th>Task type</th>
<th style="display:none">Opened</th>
<th style="display:none">Closed</th>
<th style="display:none">Initial contact</th>
<th>Configuration item</th>
<th>Environment</th>
<th>Assignment group</th>
<th>Reassignment count</th>
<th>Department</th>
<th>Name</th>
<th>Problem</th>
<th>Short description2</th> <!-- Why was this commented out? </th-->
<th colspan="3"></th>
</tr>
</thead>
<!----------------------------------------------------------------------------
[] BREADCRUMS - SHOWS WHERE WE ARE IN THE PAGE
[] PAGEINATOR - GOOGLE THING THAT ALLOWS YOU TO CHOOSE BETWEEN MULTIPLE PAGES //look on main_page.html
----------------------------------------------------------------------------->
<tbody id="descList">
<% #incident_data_first_20.each do |incident_datum| %>
<tr>
<td><%= incident_datum.number %></td>
<td><%= incident_datum.priority %></td>
<td><%= incident_datum.state %></td>
<td data-toggle="modal" data-target="#descModal"><%= incident_datum.short_description1 %></td>
<td><%= incident_datum.ticket_type %></td>
<td><%= incident_datum.task_type %></td>
<td style="display:none"><%= incident_datum.opened %></td>
<td style="display:none"><%= incident_datum.closed %></td>
<td style="display:none"><%= incident_datum.initial_contact %></td>
<td><%= incident_datum.configuration_item %></td>
<td><%= incident_datum.environment %></td>
<td><%= incident_datum.assignment_group %></td>
<td><%= incident_datum.reassignment_count %></td>
<td><%= incident_datum.department %></td>
<td><%= incident_datum.name %></td>
<td><%= incident_datum.problem %></td>
<td style="display:none"><%= incident_datum.description %></td>
<td style="display:none"><%= incident_datum.short_description2 %></td>
<td><%= link_to 'Show', incident_datum %></td>
<td><%= link_to 'Edit', edit_incident_datum_path(incident_datum) %></td>
<td><%= link_to 'Destroy', incident_datum, method: :destroy, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</tbody>
</table>
</div>
<%= render partial: "modal", locals: {zone: #zone} %>
routes:
Rails.application.routes.draw do
#resources :incident_data
# INDEX
#root to: 'analysis#main_page'
# Database Tables
resources :incident_data do
collection { post :import }
end
root to: 'analysis#main_page' #MG
# ADDITIONAL PAGES
get 'analysis/main_page'
get 'analysis/new_tile'
get 'analysis/ticket_identification'
get 'analysis/detailed_view'
get 'analysis/import_data'
get 'analysis/test'
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end
Console:
Processing by IncidentDataController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"lBXX210GVPazui46U8rATpzrXCMJw8DAqb7Hc3WWK2uTU3WGojClRU7+ZKkakCjUblweOV7UpM+FiIvRSNzSng==", "file"=>#<ActionDispatch::Http::UploadedFile:0x00000002829388 #tempfile=#<Tempfile:/tmp/RackMultipart20180110-11292-jzqi2l.csv>, #original_filename="incident_datum.csv", #content_type="application/vnd.ms-excel", #headers="Content-Disposition: form-data; name=\"file\"; filename=\"incident_datum.csv\"\r\nContent-Type: application/vnd.ms-excel\r\n">, "commit"=>"Import CSV"}
Completed 400 Bad Request in 2ms (ActiveRecord: 0.0ms)
ActionController::ParameterMissing (param is missing or the value is empty: incident_datum):
app/controllers/incident_data_controller.rb:84:in `incident_datum_params'
app/controllers/incident_data_controller.rb:39:in `create'
^C- Gracefully stopping, waiting for requests to finish
=== puma shutdown: 2018-01-10 14:20:33 +0000 ===
- Goodbye!
Exiting
Thank you!

Answer 1

I think your problem is your Form (if you want keep rails convention), you have to create a IncidentDatum element and create a form for this element like:
<%= form_for #incident_data , multipart: true do %>
...
With this you create a form like incident_datum : { file: .... }
This format you spec in the def incident_datum_params method
params.require(:incident_datum).permit( :number , ....
Also you need to add file to permit
params.require(:incident_datum).permit( :number , :file , ....
You can see the format of your post in your console browser network tab and also in the log you post in the question:
Processing by IncidentDataController#create as HTML Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"lBXX210GVPazui46U8rATpzrXCMJw8DAqb7Hc3WWK2uTU3WGojClRU7+ZKkakCjUblweOV7UpM+FiIvRSNzSng==",
"file"=>#,
#original_filename="incident_datum.csv",
#content_type="application/vnd.ms-excel",
#headers="Content-Disposition: form-data; name=\"file\";
filename=\"incident_datum.csv\"\r\nContent-Type:
application/vnd.ms-excel\r\n">, "commit"=>"Import CSV"} Completed 400
Bad Request in 2ms (ActiveRecord: 0.0ms)
You can see file direct in the params ( no inside incident_data incident_data: { fiel: .... } )