Deprecated Warnings in RoR 4.1 - ruby-on-rails

Question

I was coding my Devise/CanCan combo authorization setup and running some debugging.
I keep encountering this statement everytime I refresh my browser.
Processing by Admin::UsersController#index as HTML
DEPRECATION WARNING: Relation#first with finder options is deprecated. Please bu
ild a scope and then call #first on it instead. (called from C:in `first':)
The deprecation warning says that it comes from the C:in 'first'.
But what does that supposed to mean?!?
Where am I supposed to find that in my RoR environment? Looks like it's to be found on a C folder. But my ROR project is on the D drive, not C!
Has anybody seen this warning before?
class Admin::UsersController < Admin::AdminController
load_and_authorize_resource
#def get_user
# #current_user = current_user
#end
# GET /users
# GET /users.json
def index
#users = User.all
##users = User.accessible_by(current_ability, :index).limit(20)
respond_to do |format|
format.json { render :json => #users }
format.xml { render :xml => #users }
format.html
end
end
# GET /users/1
# GET /users/1.json
def show
#user = User.find(params[:id])
respond_to do |format|
format.json { render :json => #user }
format.xml { render :xml => #user }
format.html
end
end
# GET /users/new
def new
#user = User.new
respond_to do |format|
format.json { render :json => #user }
format.xml { render :xml => #user }
format.html
end
rescue ActiveRecord::RecordNotFound
respond_to_not_found(:json, :xml, :html)
end
# GET /users/1/edit
def edit
#user = User.find(params[:id])
respond_to do |format|
format.json { render :json => #user }
format.xml { render :xml => #user }
format.html
end
rescue ActiveRecord::RecordNotFound
respond_to_not_found(:json, :xml, :html)
end
# POST /users
# POST /users.json
def create
#user.attributes = params[:user]
#user.role_ids = params[:user][:role_ids] if params[:user]
#user = User.new(params[:user])
respond_to do |format|
if #user.save
flash[:notice] = flash[:notice].to_a.concat #user.errors.full_messages
format.html { redirect_to root_url, notice: 'Signed Up!' }
format.json { render action: 'show', status: :created, location: #user }
else
flash[:notice] = flash[:notice].to_a.concat #user.errors.full_messages
format.html { render action: 'new' }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
#user = User.find(params[:id])
if params[:user][:password].blank?
[:password,:password_confirmation,:current_password].collect{|p| params[:user].delete(p) }
else
#user.errors[:base] << "The password you entered is incorrect" unless #user.valid_password?(params[:user][:current_password])
end
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to #user, notice: 'User was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
rescue ActiveRecord::RecordNotFound
respond_to_not_found(:js, :xml, :html)
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
user = User.find(params[:id])
#user.destroy
respond_to do |format|
format.html { redirect_to users_url }
format.json { head :no_content }
end
rescue ActiveRecord::RecordNotFound
respond_to_not_found(:json, :xml, :html)
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
##user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:username, :password, :password_confirmation)
end
end