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class Post < ActiveRecord::Base
validates :body, :author_id,:wall_id ,presence: true
has_attached_file :photo, default_url: "missing-post.png"
validates_attachment_content_type :photo, content_type: /\Aimage\/.*\Z/
belongs_to :wall,
foreign_key: :wall_id,
primary_key: :id,
class_name: :User
belongs_to :author,
class_name: :User,
primary_key: :id,
foreign_key: :author_id
has_many :comments,
class_name: :Comment,
primary_key: :id,
foreign_key: :post_id
def self.find_posts_by_wall_id(id)
Post.all.where("wall_id = id").order("created_at DESC")
end
def self.find_posts_of_friends(id)
friend_ids = User.find(id).accepted_friends_ids
friend_ids_string = "(#{friend_ids.join(', ')})"
Post.where("author_id IN 'friend_ids_string'")+
Post.where("wall_id IN 'friend_ids_string'")
end
end
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