Nested Routes can not index all - ruby-on-rails

Question

I have nested routes as follows;
resources :boats, except: :destroy do
resources :pictures
end
So user can upload picture and everything works fine. But picture/index.html.erb. I can not see all the pictures. It returns nil. But I can see pictures in the database. Probably because I try to retrieve wrong parameter.
When I take out the if statement <% if #pictures.present? %> it throws and error;
NoMethodError in PicturesController#create
undefined method `each' for nil:NilClass
<% #pictures.each do |pic| %>
Here is #index view;
<div class="container">
<h1>Pictures#index!</h1>
<p>Find me in app/views/pictures/index.html.erb</p>
<% if #pictures.present? %> <!-- Returns nil-->
<% #pictures.each do |pic| %>
</br>
<%= pic.name %>
<%= image_tag pic.image_url(:thumb).to_s %>
<%= link_to "edit", edit_boat_picture_path(#boat, #picture) %> |
<td><%= link_to 'Destroy', [#boat, #picture], confirm: 'Are you sure?', method: :delete %></td> |
</br>
<% end %>
<% end %>
<%= link_to "edit", edit_boat_picture_path(#boat, #picture) %> |
</br>
</br>
<%= link_to "add", new_boat_picture_path(#boat, #picture) %>
</div>
So here, picture.present returns always nil, so I can not display any images.
Here is pictures controller;
class PicturesController < ApplicationController
before_action :logged_in_user
before_filter :load_parent
def index
#pictures = #boat.pictures.all
end
def new
#picture = #boat.pictures.new
end
def show
#picture = #boat.pictures.find(params[:id])
end
def create
#picture = #boat.pictures.new(picture_params)
if #picture.save
#flash[:success] = "Continue from here"
render 'index'
#redirect_to boat_path(#boat)
else
render 'new'
end
end
def edit
#picture = Picture.find(params[:id])
end
def update
#picture = #boat.pictures.find(params[:id])
if #picture.update_attributes(picture_params)
flash[:notice] = "Successfully updated picture."
render 'index'
else
render 'edit'
end
end
def destroy
#picture = #boat.pictures.find(params[:id])
#picture.destroy
flash[:notice] = "Successfully destroyed picture."
redirect_to boat_path(#boat)
end
private
def picture_params
params.require(:picture).permit(:name, :image)
end
def load_parent
#boat = Boat.find(params[:boat_id])
end
end
EDIT 1:
Log;
{"utf8"=>"✓", "authenticity_token"=>"i3FW1zbhoGW2vavipN9NJ2Fvi9R1Lk/CKDsAttuqHWb8rFNmJgXpjE2D25oAqJ3xp9BXAnd0kDmrdIxhn1Qrpw==", "picture"=>{"name"=>"", "image"=>#<ActionDispatch::Http::UploadedFile:0x007fb4a5f50f30 #tempfile=#<Tempfile:/var/folders/w0/703ccggs56l3hrc79h3rdylm0000gn/T/RackMultipart20150423-5028-1rbpgnj.jpg>, #original_filename="imgres-4.jpg", #content_type="image/jpeg", #headers="Content-Disposition: form-data; name=\"picture[image]\"; filename=\"imgres-4.jpg\"\r\nContent-Type: image/jpeg\r\n">}, "commit"=>"Done", "controller"=>"pictures", "action"=>"create", "boat_id"=>"114"}
EDIT 2:
if I add #pictures = #boat.pictures.all to create that is fine, but all pics have its own destroy button.And when I look at them all shows the same address, so clicking to destroy, destroys all of them;
All of the destroy ids are the same. I though index action lists all and destroy erases individually. This case is same for edit action too
EDIT 3:
#boats controller
class BoatsController < ApplicationController
before_action :logged_in_user, only: [:new, :show, :edit, :update]
def new
#boat = Boat.new
end
def create
#boat = current_user.boats.new(boat_params) if logged_in?
if #boat.save
#flash[:success] = "Continue from here"
render 'edit'
else
render 'new'
end
end
def show
#boat = Boat.find(params[:id])
end
def edit
#boat = Boat.find(params[:id])
end
def update
#boat = Boat.find(params[:id])
if #boat.update_attributes(boat_params)
flash[:success] = "The Boat Saved"
redirect_to root_path
else
render 'edit'
end
end
def update_years
# updates year and model based on brand selected
brand = Brand.find_by_name(params[:brand_name])
# map to name and id for use in our options_for_select
#years = brand.years.map{|a| [a.name, a.name]}.insert(0, "Select a Year") #use a.name here instead of a.id
#models = brand.models.map{|s| [s.name, s.name]}.insert(0, "Select a Model")#use s.name here instead of s.id
end
def update_models
# updates model based on year selected
year = Year.find_by_name(params[:year_name])
#models = year.models.map{|s| [s.name, s.name]}.insert(0, "Select a Model") #use s.name here instead of s.id
end
private
def boat_params
params.require(:boat).permit(:brand, :year, :model, :captained, :boat_type, :daily_price, :boat_length, :listing_tagline, :listing_description, :boat_category, :hull_material, :mast_material)
end
end

Answer 1

There is no #pictures in your create action.
You can try:
def create
#picture = #boat.pictures.new(picture_params)
if #picture.save
#flash[:success] = "Continue from here"
#pictures = #boat.pictures.all
render 'index'
#redirect_to boat_path(#boat)
else
render 'new'
end
end
For buttons:
<% #pictures.each do |pic| %>
</br>
<%= pic.name %>
<%= image_tag pic.image_url(:thumb).to_s %>
<%= link_to "edit", edit_boat_picture_path(#boat, pic) %> |
<td><%= link_to 'Destroy', boat_picture_path(#boat, pic), confirm: 'Are you sure?', method: :delete %></td> |
</br>
<% end %>