Rails :Inserting values into Mysql table - mysql

Question

I have a table admin_users. Model named AdminUser.
Schema is
ActiveRecord::Schema.define(version: 20130915031734) do
create_table "admin_users", force: true do |t|
t.string "first_name", limit: 25
t.string "last_name", limit: 50
t.string "email", limit: 100, default: "", null: false
t.string "username", limit: 25
t.datetime "created_at"
t.datetime "updated_at"
t.string "password_digest"
end
add_index "admin_users", ["username"], name: "index_admin_users_on_username", using: :btree
How can I insert values into the table ??
I tried this ( Image below)
Using rails console

Answer 1

It is best to use a db/seeds.rb file and run rake db:seed (or similar mechanism) to populate a database.
Within a migration you have access to the full application environment. That means you can use your model classes, but since models can change over time it is not very safe to reference them within migrations. In migrations you may also execute arbitrary SQL using the execute method.

Answer 2

With the file db/seeds.rb, the Rails have given us a way of feeding default values easily and quickly to a fresh installation. This is a normal Ruby program within the Rails environment. You have full access to all classes and methods of your application.
So you do not need to enter everything manually with rails console in order to make the records created in the section called “create” available in a new Rails application, but you can simply use the following file db/seeds.rb:
Sample Code.
Country.create(name: 'Germany', population: 81831000)
Country.create(name: 'France', population: 65447374)
Country.create(name: 'Belgium', population: 10839905)
Country.create(name: 'Netherlands', population: 16680000)
Other than Seeds, you can use migration file for the same.
ActiveRecord::Schema.define(version: 20130915031734) do
create_table "admin_users", force: true do |t|
t.string "first_name", limit: 25
t.string "last_name", limit: 50
t.string "email", limit: 100, default: "", null: false
t.string "username", limit: 25
t.datetime "created_at"
t.datetime "updated_at"
t.string "password_digest"
end
add_index "admin_users", ["username"], name: "index_admin_users_on_username", using: :btree
/*Add your script here to insert some predifined value.*/
AdminUsers.create(first_name: 'Nair', email: 'nair#gmail.com', username: 'nairg' )
AdminUsers.create(first_name: 'Nair1', email: 'nair1#gmail.com', username: 'nairg1' )
AdminUsers.create(first_name: 'Nair2', email: 'nair2#gmail.com', username: 'nairg2' )
/* ... So on as per your requirement */
end
To Generate Seed file : Generating Seeds Blog

Answer 3

you can make create method in controller to save data,
def create
#admin_user = Admin_user.new(admin_users_params)
if #admin_user.save
redirect_to :action => "index"
else
render action: 'new'
end
end
def admin_users_params
params.require(:admin_user).permit(:first_name, :last_name, :email, :username)
end