Rails: Common Migration, Table, Column Tasks

###############################
#Common Migration Tasks
###############################
#Generate a new migration template
ruby script/generate migration AddNewColumnNameToModel column_name:[integer, string, boolean, text]
 
#Create a new migration for adding the "sessions" table
1. rake db:session:create
2. Uncomment #ActionController::Base.session_store = :active_record_store form /my_rails_app/config/initializers/session_store.rb
 
#Migrate to Version 0
rake db:migrate VERSION=0
 
#Applies any pending migrations to the database
db:migrate 
 
#Rolls back one database migration and then reapplies it
db:migrate:redo 
 
#Drops the database and reapplies all migrations
db:migrate:reset 
 
#Applies the next pending migration
db:up
 
#Rolls back the last applied migration 
db:down 
 
#Creates the database from the environment specified 
db:create:all 
db:create 
 
#Removes the database from the environment specified 
db:drop:all (Rails +2.0)
db:drop 
 
#Drops and re-creates the database
db:reset
 
###############################
#Table modification methods 
###############################
 
#Create a new table. 
create_table(name, options)
 
#Drop the specified table. 
drop_table(name)
 
#Rename the table from old_name to new_name.
rename_table(old_name, new_name)
 
###############################
#Column modification methods 
###############################
#Add a new column to table.
add_column(table, column, type, options)
 
#Rename the specified column from old_column_name to new_column_name.
rename_column(table, old_column_name, new_column_name)
 
#Modify a column by changing it to a different type.
change_column(table, column, type, options)
 
#Remove the column from the specified table. Index modification methods
remove_column(table, column)
 
#Add a new index on the specified columns. 
add_index(table, columns, options)
 
#Drop the specified index.
remove_index(table, index)