On Tue, Jan 10, 2012 at 5:41 PM, amir e. <[email protected]> wrote:
> ## Hi ## > I have 6 simple and fundamental Problem in RoR migration and although I > googled it and read many article about it and research it for a week , I > didn't understand it. please help me for these problems : > > ---------- > > 1 - When I create a model (for example "rails generate model > Football_League") , I see in db/migration a "create_football_leagues.rb" > . I want know what is the rules of RoR for changing the name that I gave > to my migration ? ( My migration's name was FootballLeague and ruby > cretaed "create_football_leagues.rb") > > > ---------- > > > 2 - What is the rules of naming ruby for creating a class in that file ? > ( Ruby created a "CreateFootballLeague" class in > "create_football_leagues.rb") > > > ---------- > > > 3 - After I use rake db:migrate , although I had 3 migration, I just see > such a image in cmd : ( I attached this image ) > and I didn't any migration for another 3 migrations whereas sometimes > ago when I run a migration with rake db:migrate, all my migrations are > migrated. > > > ---------- > > > 4 - After I type rake db:migrate and after that Rake execute > "create_football_leagues.rb" I go to mysql and I saw a table with > "schema_migrations" name. and in that table there are some versions of > my migrations. now I want to know what is the application of such a > table ? > > > ---------- > > > 5 - In http://guides.rubyonrails.org I read that if we want to change > the primary key of a table from default id to our own field we must use > :primary_key option but I didn't understand how can I use it .If someone > can give an example for this subject. > > > ---------- > > 6 - What is the difference between this 2 commands : 1 - "rails generate > migration footabll" 2 - rails generate model football. I knew that > with "rails generate model football" we must some extra file in > app/model but I don't understand function of those files. > > > My friend please help me to solve these fundamental problems . special > thanks . > > Attachments: > http://www.ruby-forum.com/attachment/6895/1.JPG > > Study "Rails Guides" http://guides.rubyonrails.org/ * Getting started * Migrations * check for "generators" * ... HTH, Peter -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
