How can I get data from database in ruby [closed]

Answer 1

You really need to go back to the drawing board, dude.

Most rails beginners start off with the twitter clone tutorials, at least that's what I did.

Here is a free course from codeschool.com that I used when I first started off to start working with ActiveRecord https://www.codeschool.com/courses/rails-for-zombies-redux

Answer 2

Following should be Model code:

Class Window < ActiveRecord::Base
  has_many :channels
end

class Channel < ActiveRecord::Base
  belongs_to :window
end

In the console, do the following:

@window = Window.create(window: "This is window-1")

This will create a windows-instance and saves it into the database.

100.times do |index|
  Channel.create(channel: Random.rand(1000),
                 data:    Random.rand(1000),
                 window:  @window)
end

This will create 100 Channel instances that belong to the earlier-created-window. Also, saves them to the database.

@window.channels will return the corresponding 100 channels.

This is how you write/insert record and read/fetch record.

Please do read http://edgeguides.rubyonrails.org/active_record_basics.html#create and http://edgeguides.rubyonrails.org/active_record_basics.html#read for better clarity and exploring futher,