How to display posts for a project?

Question

Ruby on Rails

Hi friends!
I can not understand in any way, I have a problem with these requests.
I honestly tried to solve it myself, but I didn’t get it.
Selection of projects

@posts_project = 
      Project
        .limit(3)
        .order(created_at: :desc)

Which outputs 3 projects.
How now from the post table to display 5 news for each of the 3 projects?
And to make it so that if, when adding fresh news to the project, this project would come first?
Use join?

Answer 1

@projects = Project.limit(3).order(created_at: :desc)
@projects.each do |project| 
  project.posts.limit(5).each {|post| @posts << post}
end
@posts_project = @posts.order(created_at: :desc)

and don't forget to include has many :posts relationships for the project model