Ruby on Rails - ActiveAdmin Posts - ruby-on-rails

Question

i followed a Youtube Video to implement ActiveAdmin Theme in my Rails App,- and everything worked like a charm (i thought).
https://www.youtube.com/watch?v=i2x995hm8r8
I followed every Step he took and i am a little confused right now because i can't create posts.
Whenever i try to create a New Post and type in the tile, body and select a image- it just won't do anything. It doesn't even give me a Error Message.
posts_controller.rb
class PostController < ApplicationController
def index
#post = Post.all.order('created_at DESC')
end
def create
#post = Post.new(params[:post].permit(:title, :body))
if #post.save
redirect_to #post
else
render 'new'
end
end
def show
#post = Post.find(params[:id])
#post = Post.order("created_at DESC").limit(4).offset(1)
end
def edit
#post = Post.find(params[:id])
end
def update
#post = Post.find(params[:id])
if #post.update(params[:post].permit(:title, :body))
redirect_to #post
else
render 'edit'
end
end
def destroy
#post = Post.find(params[:id])
#post.destroy
redirect_to posts_path
end
private
def post_params
params.require(:post).permit(:title, :body)
end
end
ActiveAdmin.register Post do
posts.rb
permit_params :title, :body, :image
show do |t|
attributes_table do
row :title
row :body
row :image do
post.image? ? image_tag(post.image.url, height: '100') : content_tag(:span, "No image yet")
end
end
end
form :html => {:multipart => true} do |f|
f.inputs do
f.input :title
f.input :body
f.input :image, hint: f.post.image? ? image_tag(post.image.url, height: '100') : content_tag(:span, "Upload JPG/PNG/GIF image")
end
f.actions
end
end
post.rb
class Post < ApplicationRecord
belongs_to :user
validates :title, presence: true, length: {minimum: 5}
validates :body, presence: true, length: { maximum: 140}
has_attached_file :image, styles: { medium: "300x300>", thumb: "100x100>" }
validates_attachment_content_type :image, content_type: /\Aimage\/.*\z/
end
EDIT I:
Started POST "/admin/posts" for 127.0.0.1 at 2018-03-20 14:30:24 +0100
Processing by Admin::PostsController#create as HTML
Parameters: {"utf8"=>"✓",
"authenticity_token"=>"f+hfBD3lzgXEfz1q38/i3YciHsbb5LYWbbHUUsyIeOCaNSUReUUVVTBE//Dw0zXxSuFCzcMfYuUGDtIJlNb58w==", "post"=>{"title"=>"asdasdasd", "body"=>"asdasdasd"}, "commit"=>"Create Post"}
AdminUser Load (0.3ms) SELECT "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = $1 ORDER BY "admin_users"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
(0.2ms) BEGIN
(0.1ms) ROLLBACK
Rendering /Users/useruser/.rvm/gems/ruby-2.4.2/bundler/gems/activeadmin-2cf85fb03ab3/app/views/active_admin/resource/new.html.arb
Rendered /Users/useruser/.rvm/gems/ruby-2.4.2/bundler/gems/activeadmin-2cf85fb03ab3/app/views/active_admin/resource/new.html.arb (134.6ms)
Completed 200 OK in 230ms (Views: 148.3ms | ActiveRecord: 5.7ms)
If you need more of my Code just tell me what i should post in here.
I am just getting started with Ruby on Rails and Programming overall, so yes indeed, i am a Newb.
Thanks in advance!

Answer 1

From what I see in your edit 1, I see that you render new after submiting form. It means that your Post is not being saved. It also means that your application does exactly what it should do.
I assume that you are using latests Rails 5.
In Post model, you have belongs_to association (Post belongs to User).
In Rails 5, that means user or user_id has to be provided, to create Post (Post cannot belong to noone), else you won't be able to save.
Depending how you created association in table, you might be able to pass user or user_id in params.
Another way to create post belonging to particular user is:
#user = User.first
#post = #user.posts.build(post_params)
For ActiveAdmin, you can use default form that is created based on your model.
Just make sure you permit all params when creating it that way
ActiveAdmin.register Post do
permit_params %i[title body image user_id]
...
end
You can also set belongs_to :user association as optional.
Now some general advices from me:
First of all use proper indentation.
My advice to you is install Rubocop gem.
Second:
def show
#post = Post.find(params[:id])
#post = Post.order("created_at DESC").limit(4).offset(1)
end
That doesn't make much sense, you overwrite instance variable just after first assignment.
#post = Post.order("created_at DESC").limit(4).offset(1) is more of an index action, since it does not show particular posts, it show 2..5 newest posts.
def post_params
params.require(:post).permit(:title, :body)
end
Misses image attribute.
def update
#post = Post.find(params[:id])
if #post.update(params[:post].permit(:title, :body))
redirect_to #post
else
render 'edit'
end
end
You duplicate params[:post].permit(:title, :body). You hgave already created private method for that. Use it here. Same goes for creation action, you duplicated it there too. Read what DRY code is about (google it).

Answer 2

You have belongs_to :user but never set a user_id. A belongs_to relation is by default required (in recent rails 4/5), and this will block the saving. The easiest way, for now, to fix this is to write it as following
belongs_to :user, optional: true
[EDIT: how to store current-user as owner of post]
If you want to automatically set the user to the currently logged in user, which I think is the intention, you can add the following to your active-admin configuration:
ActiveAdmin.register Post do
# .. keep your original configuration here ...
before_build do |record|
record.user = current_user
end
end
Or add an extra field to the form allowing the administrator to select the user?