How to create rails association -

how create rails associations this:

and example show this:

i'd assume have users table first, , each user object has_one or has_many skill_set or skill_sets respectively.

table name: users id first_name last_name address  1  arslan     ali       abc 2  adnan      saqib     abc 3  mahtab     maqsood   abc 

and table, skill_sets:

table name: skill_sets id user_id dance_skill sing_skill model_skill 1  1       1           2          2 2  3       2           2          3 3  2       1           1          2 

and, in rails, model following:

class user < activerecord::base   has_one :skill_set # i'd go 1 skill set per user end  class skillset < activerecord::base   belongs_to :user # it'd have 'user_id' in it. end 

for migrations, i'd have like:

class createusers < activerecord::migration   def change     create_table :users |t|       t.stirng first_name       t.string last_name       t.string address        t.timestamps null: false     end   end end  class createskillsets < activerecord::migration   def change     create_table :skill_sets |t|       t.references :user, index: true       t.integer :dance_skill, null: false, default: 1       t.integer :sing_skill,  null: false, default: 1       t.integer :model_skill, null: false, default: 1     end   end end 

and don't understand, why using table skills if have store 3 rows. can have following in model:

class skillset < activerecord::base   skill_level = ["good","profi","noob"]          def skill_level(number)     skill_level[number-1] # arrays based on zero-index.    end    # can user.skill_level(user.dance_skill)   # other way: can 'enums' well, you.  end