Unpermitted parameter error in Ruby on Rails - ruby-on-rails

Question

When creating a record in Rails Controller, the following error occurs :
Started POST "/spr_type_courses" for 127.0.0.1 at 2018-06-27 08:11:01
+0500 Processing by SprTypeCoursesController#create as HTML Parameters: {"spr_type_course"=>{}} Unpermitted parameter:
:spr_type_course Sequence (3.0ms) select us.sequence_name from
all_sequences us where us.sequence_owner = 'PROJECT' and
us.sequence_name = upper('SPR_TYPECOURSES_seq') Primary Key (10.0ms)
SELECT cc.column_name FROM all_constraints c, all_cons_columns cc
WHERE c.owner = 'PROJECT' AND c.table_name = 'SPR_TYPECOURSES' AND
c.constraint_type = 'P' AND cc.owner = c.owner AND cc.constraint_name
= c.constraint_name Primary Key Trigger (3.8ms) SELECT trigger_name
FROM all_triggers
WHERE owner = 'PROJECT'
AND trigger_name = q'[PROJECT.SPR_TYPECOURSES_PKT]'
AND table_owner = 'PROJECT'
AND table_name = q'[SPR_TYPECOURSES]'
AND status = 'ENABLED'
SQL (5.3ms) INSERT INTO "PROJECT"."SPR_TYPECOURSES"
("TYPECOURSE_ID") VALUES (:a1) [["typecourse_id", 3623]] Completed 500
Internal Server Error in 61ms
ActiveRecord::NotNullViolation (OCIError: ORA-01400: cannot insert
NULL into ("PROJECT"."SPR_TYPECOURSES"."DATE_BEGIN"): INSERT INTO
"PROJECT"."SPR_TYPECOURSES" ("TYPECOURSE_ID") VALUES (:a1)):
app/controllers/spr_type_courses_controller.rb:17:in `create'
What can this mean and what needs to be done to correct it?
class SprTypeCoursesController < ApplicationController
before_action :set_spr_type_course, only: [:show, :update, :destroy]
def index
#spr_type_courses = SprTypeCourse.all
render json: #spr_type_courses
end
def show
render json: #spr_type_course
end
def create
#spr_type_course = SprTypeCourse.new(spr_type_course_params)
if #spr_type_course.save
render json: #spr_type_course, status: :created, location: #spr_type_course
else
render json: #spr_type_course.erros, status: :unprocessable_entity
end
end
def update
if #spr_type_course.update(spr_type_course_params)
render json: #spr_type_course
else
render json: #spr_type_course.errors, status: :unprocessable_entity
end
end
def destroy
#spr_type_course.destroy
end
private
def set_spr_type_course
#spr_type_course = SprTypeCourse.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def spr_type_course_params
params.permit(
:typecourse_id,
:date_begin,
:date_end,
:name,
:comments,
:active_id
)
end
end

Answer 1

Your spr_type_course_params is the problem.
As you can see in the error log, the spr_type_course parameter is not being allowed in the strong parameters. Also, spr_type_course parameter is empty. Please review the submitted form too.
{"spr_type_course"=>{}} Unpermitted parameter:
Change it by the following:
def spr_type_course_params
# here I assume the typecourse_id, date_begin etc params are all
# included in spr_type_course schema
params.require(:spr_type_course).permit(
:typecourse_id,
:date_begin,
:date_end,
:name,
:comments,
:active_id
)
end