How to give an instance variable access to an 'id' in rails? - ruby-on-rails

Question

I have a "userinfos_controller" where user stores their information. They also can upload a video to their profile. I am showing this video under the show method in the userinfos_controller as shown below. I want the '#myvideo" to get the video associated with the user. When a user deletes their video and re-upload, the video_id changes. So I can't call that video using the video_id. Is there a way to call Video.userinfo.last? I don't want to call Video.last, because it'll give me the last video uploaded across all users, not just the last video uploaded by that particular user. You can also see in my rails console, the video has a user_id, userinfo_id and a video_id. So right now, under my show method, when I do:
def show
#myvideo = Video.find(params[:userinfo_id])
end
It looks for Video_id that is equal to userinfo_id, while I want it to look for the last video uploaded by that particular user/userinfo.
My id relationships(please right click and open in new tab to see more clearly):
My userinfos controller:
class UserinfosController < ApplicationController
before_action :find_userinfo, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!
def index
#userinfors = Userinfo.all
#myvideo = Video.all
end
def show
#myvideo = Video.find(params[:userinfo_id])
end
def new
#userinformation = current_user.userinfos.build
end
def create
#userinformation = current_user.userinfos.build(userinfo_params)
if #userinformation.save
redirect_to root_path
else
render 'new'
end
end
def edit
end
def update
end
def destroy
#userinformation.destroy
redirect_to userinfo_path
end
private
def userinfo_params
params.require(:userinfo).permit(:name, :email, :college, :gpa, :major)
end
def find_userinfo
#userinformation = Userinfo.find(params[:id])
end
end
Show video view:
<div>
<%= video_tag #myvideo.introvideo_url.to_s, :size => "480x320", :controls =>true %>
</div>
Video model:
class Video < ActiveRecord::Base
belongs_to :userinfo
belongs_to :user
mount_uploader :introvideo, VideoUploader
end
Userinfo model:
class Userinfo < ActiveRecord::Base
belongs_to :user
has_many :videos
end
User model:
class User < ActiveRecord::Base
has_many :vidoes
has_many :userinfos
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
My migrations that show all the id's added:
My routes:

Answer 1

Either create a direct association between User and Video - or make it indirect through a join model. Don't do both.
Direct 1-n:
class User < ApplicationRecord
has_many :videos
has_many :user_infos
# ...
end
class Video < ApplicationRecord
belongs_to :user
# ...
end
class UserInfo < ApplicationRecord
belongs_to :user
has_many :videos, through: :user
end
Indirect 1-n:
class User < ApplicationRecord
has_many :user_infos
has_many :videos, through: :user_infos
# ...
end
class UserInfo < ApplicationRecord
belongs_to :user
has_many :videos
end
class Video < ApplicationRecord
belongs_to :user_info
has_one :user, through: :user_info
# ...
end
Both will let you do:
#user.videos.last
#user_info.videos.last
def show
#my_video = #user_info.videos.order(created_at: :desc).last
end

Answer 2

Try with ActiveRecord#last:
def show
#myvideo = Video.where('userinfo_id = ?', params[:userinfo_id]).last
end
That will give you the videos uploaded to userinfo with id equal to params[:userinfo_id] taking the last record.

Answer 3

Not sure if I understood you correctly, but I think you want to access the Video that your user previously uploaded, after it uploaded the new one.
Assuming you have a has_many :videos relationship set up on the User model, you can do this:
#user.videos.order(created_at: :desc).second
Or if you don't have the user instance and just have user_id.
Video.where(userinfo_id: params[:userinfo_id]).order(created_at: :desc).second
Hope this helps.
EDIT:
Or maybe you just want to access the latest users video. Again, I don't know how you set up your relations. I am assuming user can have many videos.
Video.where(userinfo_id: params[:userinfo_id]).order(created_at: :desc).first
Or shorter
Video.where(userinfo_id: params[:userinfo_id]).last