Rails Migration: Bigint on PostgreSQL seems to be failing?

问题

Trying to create a table with a bigint column creates a standard integer column instead. What could be going wrong? I don't know where to start looking.

I'm using this in the migration:

create_table :table_name do |t|
  t.integer :really_big_int, limit: 8
end

I'm using Ruby 1.9.2, PostgreSQL 9.0.3 and Rails 3.0.9. I've dropped the database and ran the migrations several times and it still doesn't create the bigint column.

回答1:

For some reason the create table doesn't like bigint. You can, however do it with add_columm using the bigint data type:

add_column :table_name, :really_big_int, :bigint

Then you don't need that limit stuff.

回答2:

This works in Rails 4

t.column :really_big_int, :bigint

回答3:

Rails 5.0.0.1 it works:

  def change
    create_table :huge do |t|  
      t.integer :big_bastard, limit: 8
    end
  end

回答4:

In rails 4.2 + you can use like:

create_table :table_name do |t|
   t.bigint :really_big_int
end

回答5:

I was able to create a bigint using t.column. This is useful if you want to control the column order in the table.

create_table :table_name do |t|
  t.string :other_column
  t.column :really_big_int, :bigint
  .
  .
  t.timestamps
end

I'm using Rails 3.2.12 with pg gem version 0.15.1 (x86-mingw32).

来源：https://stackoverflow.com/questions/7061239/rails-migration-bigint-on-postgresql-seems-to-be-failing