On 10 January 2012 16:41, 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 :
Rather than answer the questions in detail I suggest that you work right through a good tutorial such as railstutorial.org, which is free to use online, then many such questions will be answered. Also look at the Rails Guides. Make sure that you have installed the version of rails that matches the tutorial you are using. I will say, though, do not change the primary key from id unless you absolutely must do this, to cope with a legacy database. Otherwise you will make life difficult. Colin > > ---------- > > 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 > > > -- > Posted via http://www.ruby-forum.com/. > > -- > 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. > -- gplus.to/clanlaw -- 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.
