How do I convert a SQL query to rails? - ruby-on-rails

Question

I'm new to ROR. The query I created below is functioning properly. I'm trying to prepare an interrogation. But I didn't succeed. The query is as follows;
#rad_user_group.groupname = SELECT groupname FROM radgrs INNER JOIN nas WHERE radgrs.grdefault = true AND radgrs.tenant_id = nas.tenant_id AND nas.realipaddr = "192.168.22.175" AND nas.active = true
How do I make a switch case for the following queries in another question? Returns NULL if the query fails.
Thank you for caring.
def realipaddr
request.remote_addr
end
def create
#rad_check = RadCheck.new(rad_check_params)
#rad_check.tenant_id = Na.find_by(realipaddr: realipaddr, active: :true).tenant_id
respond_to do |format|
if #rad_check.save
format.html { redirect_to #rad_check, notice: 'Rad check was successfully created.' }
format.json { render :show, status: :created, location: #rad_check }
else
format.html { render :new }
format.json { render json: #rad_check.errors, status: :unprocessable_entity }
end
end
end
RadCheck Model
class RadCheck < ApplicationRecord
has_one :rad_user_group, dependent: :destroy
after_initialize :add_rad_user_group
before_save :set_radcheck
def add_rad_user_group
self.rad_user_group ||= RadUserGroup.new if self.new_record?
end
def set_radcheck
self.rad_user_group.username = username
self.op = ":="
self.attribu = "Cleartext-Password"
end
end
class CreateRadChecks < ActiveRecord::Migration[5.2]
def change
create_table :rad_checks do |t|
t.integer :tenant_id
t.string :username
t.string :password
t.string :attribu
t.string :op
t.string :realipaddr
t.string :groupname
t.timestamps
end
end
end
Radgr Model
class Radgr < ApplicationRecord
end
class CreateRadgrs < ActiveRecord::Migration[5.2]
def change
create_table :radgrs do |t|
t.integer :tenant_id
t.string :groupname
t.string :realipaddr
t.boolean :grdefault
end
end
end
RadUserGroup Model
class RadUserGroup < ApplicationRecord
belongs_to :rad_check
end
class CreateRadUserGroups < ActiveRecord::Migration[5.2]
def change
create_table :rad_user_groups do |t|
t.integer :tenant_id
t.string :username
t.string :groupname
t.references :rad_check, foreign_key: true
t.timestamps
end
end
end
Na Model
class Na < ApplicationRecord
end
class CreateNas < ActiveRecord::Migration[5.2]
def change
create_table :nas do |t|
t.integer :tenant_id
t.string :nasname
t.string :realipaddr
t.boolean :active
end
end
end
PhpMyAdmin Query

Answer 1

You should better organize the object associations. The objects obviously having some sort of relations.
Like Radgr model and Na model. I think you can make relation between these two, so later you can use query command all = Radgr.includes(:nas).where("nas.realipaddr =?", "192.168.22.175") or something similar.
Also here is a good site for converting SQL to ActiveRecord query, but you need here to create your models and associations for testing.
Please check:
http://www.scuttle.io/