Whats wrong with this migration

Rails
1

Hello,

I try to add a column named id_category to my database table berichten.
So I have this :

class Bericht < ActiveRecord::Migration
def up
add_column :berichten do [t]
t.column :name, ‘id_category’
end
end
def down
end
end

But I get wrong number ( 1 of 3 ) error message.

Can anyone tell me what’s wrong here so I can learn to write my own
migrations.

Roelof

2

you have to create a new migration for add_column
using rails g migration col_name_table_name
in that migration file you have to follow below syntax

def up
add_column : table_name, column_name, data_type
end

i hope its help to you…

3

Sorry I dont help me

I did rails g migration id_category bericht
And changed the migration file to this

class IdCategory < ActiveRecord::Migration
def up
add_column :bericht, id_category, number
end

def down
end
end

After that I did rake db:migrate and get this output :

== IdCategory: migrating

– id_category()
rake aborted!
An error has occurred, this and all later migrations canceled:

undefined local variable or method `id_category’ for
#IdCategory:0x00000004c3f0d8

Tasks: TOP => db:migrate
(See full trace by running task with --trace)

Roelof

Op dinsdag 23 oktober 2012 16:56:42 UTC+2 schreef BalaRaju V. het
volgende:

4

Op dinsdag 23 oktober 2012 17:03:29 UTC+2 schreef roelof het volgende:

5

You need something like

class IdCategory < ActiveRecord::Migration
def up
add_column :bericht, ‘id_category’, :integer
end

def down
end
end

You can use either strings or symbols.

Norm

6

Thanks. Another problem solved.

Roelof

Op dinsdag 23 oktober 2012 17:10:51 UTC+2 schreef Norm het volgende: