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Ruby ActiveRecord Basics Migrations and Relationships Migrations 2

Posted by Nathan Hall
Nathan Hall
4,368 Points

i think this is incorrect

wouldn't you want to say rails generate model, not rails generate migration if you are creating the Contact Model with last_name first_name? i.e.

rails generate model Contact last_name:string first_name:string

2 Answers

Andrew Kiernan
Andrew Kiernan
26,892 Points
Andrew Kiernan
Andrew Kiernan
26,892 Points

Hi Nathan!

Normally you are right, if you want to generate a model and db migration at the same time, you would use rails generate model. However, in instances where you already have a model, you would generate a migration to add/remove/change columns and fields to the table.

The two challenges show the different ways you can add/change columns and fields through a migration, one in the migration file itself, and the other through the command-line generator.

I hope that made sense! Let me know if you have any other questions.

-Andrew

Hampton Catlin
STAFF
Hampton Catlin
Treehouse Guest Teacher
Hampton Catlin
Hampton Catlin
Treehouse Guest Teacher

Yeah, in Rails development, early on you use "generate model" a lot, but later on it's more about migrations to those existing models. So, trying to show both skills.