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Migration (Running Migration (database ($rails db:create : connect and…

- - - - match class name : CamelCased
    - - $ rails g migration ClassName(verb_noun)
      - Regular Class Name of Migration
        
        CreateTables
        
        AddColNameToTables
        
        RemoveColNameFromTables
        
        AddTable(1)RefToTables(n)
        
        CreateJoinTableTableATableB table_a table_b
        
        AddTableRefToTables
      - Passing Arugmnets
        
        colname:type { type_modifiers }
- - - - t.type :colname
      - column types
      - column modifier
      - uuid
      - decimal
    - - n:m association between two tables
      - arguments
        
        tables_a, tables_b
        
        column_options: { column modifier }
        
        table_name: symbol or string
      - t.index :table_a_id
        t.index :table_b_id
    - - specific methods
        
        t.remove :col_a, :col_b
        t.rename :name_a, :name_b
        t.change :col_name, :type, :modifier
        t.change_default :col_name, default_value
    - - change_column: change specific column definition with column name
      - add_column (table_name, column_name, type, options)
      - association
        
        add_foreign_key( from_table, :to_table )
        
        add_reference
        
        remove_foregin_key
      - rename_column : tables, old_name, new_name
- - - - VERSION=timestamp(e.g 20080906120000)
  - - - STEP=n