ruby-on-rails - 添加带有 Rails 迁移错误的整数数组列

Question

我想添加与以下操作相同的迁移:

ALTER TABLE my_table ADD COLUMN int_array integer[];

结果列:int_array，类型:integer[]，存储:extendent

我尝试了这些选项，但它不起作用。

def change
  add_column :my_table, :int_array, :integer, array: true, default: [] #first option
  add_column :my_table, :int_array, :integer, array: true, default: '{}' #second options
end

发生的错误:

==  AddIntArrayToMyTable: migrating ==========================================
-- add_column(:my_table, :int_array, :integer, {:array=>true, :default=>[]})
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::InvalidTextRepresentation: ERROR: incorrect syntax for input integer: "--- []
"
: ALTER TABLE "my_table" ADD COLUMN "int_array" integer DEFAULT '--- []

和

==  AddIntArrayToMyTable: migrating ==========================================
-- add_column(:my_table, :int_array, :integer, {:array=>true, :default=>"{}"})
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::InvalidTextRepresentation: ERROR: incorrect syntax for input integer: "{}"

任何想法可能是错误的？我正在使用 Rails Rails 3.2.16 和 postgreSQL 9.4

提前致谢。

Answer 1

我用execute 方法找到了解决方案。

def up
  execute "ALTER TABLE my_table ADD COLUMN int_array integer[];"
end

def down
  execute "ALTER TABLE my_table DROP COLUMN int_array;"
end