Ruby on Rails generates model field type - what are the options for field type

Question

I m trying to generate a new model and forget the syntax for referencing another model s ID  I d look it up myself  but I haven t figured out  among all my Ruby on Rails documentation links  how to find the definitive source     rails g model Item name string description text  and here either reference product or references product   But the better question is where or how can I look for this kind of silliness easily in the future   Note  I ve learned the hard way that if I mistype one of these options and run my migration then Ruby on Rails will totally screw up my database    and rake db rollback is powerless against such screwups  I m sure I m just not understanding something  but until I do    the  detailed  information returned by rails g model still leaves me scratching

User · Answer

Remember to not capitalize your text when writing this command. For example:

Do write:

rails g model product title:string description:text image_url:string price:decimal

Do not write:

rails g Model product title:string description:text image_url:string price:decimal

At least it was a problem to me.

User · Answer

http   guides rubyonrails org should be a good site if you re trying to get through the basic stuff in Ruby on Rails   Here is a link to associate models while you generate them  http   guides rubyonrails org getting started html associating-models

User · Answer

primary key   string   text   integer   float   decimal   datetime   timestamp   time   date   binary   boolean   references   See the table definitions section

User · Answer

rails g model Item name string description text product references  I too found the guides difficult to use  Easy to understand  but hard to find what I am looking for   Also  I have temp projects that I run the rails generate commands on  Then once I get them working I run it on my real project   Reference for the above code   http   guides rubyonrails org getting started html associating-models

User · Answer

To create a model that references another  use the Ruby on Rails model generator     rails g model wheel car references   That produces app models wheel rb   class Wheel  lt  ActiveRecord  Base   belongs to  car end   And adds the following migration   class CreateWheels  lt  ActiveRecord  Migration   def self up     create table  wheels do  t        t references  car        t timestamps     end   end    def self down     drop table  wheels   end end   When you run the migration  the following will end up in your db schema rb     rake db migrate  create table  wheels    force   gt  true do  t    t integer   car id    t datetime  created at    t datetime  updated at  end   As for documentation  a starting point for rails generators is Ruby on Rails  A Guide to The Rails Command Line which points you to API Documentation for more about available field types

User · Answer

It s very simple in ROR to create a model that references other   rails g model Item name string description text product references  This code will add  product id  column in the Item table

User · Answer

I had the same issue  but my code was a little bit different   def new   project   Project new end   And my form looked like this    lt    form for  project do  f    gt       and so on      lt   end   gt    That was totally correct  so I didn t know how to figure it out   Finally  just adding   url    projects   create      after   lt    form-for  project      gt     worked for me

User · Answer

There are lots of data types you can mention while creating model  some examples are    primary key   string   text   integer   float   decimal   datetime   timestamp   time   date   binary   boolean   references   syntax   field type data type

[ruby-on-rails] Ruby on Rails generates model field:type - what are the options for field:type?

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