Question

我正在尝试将sqlite db迁移到postgresql，并且我有外键问题。当我试图在我的pg数据库上运行db：migrate时出现错误但是当我在sqlite3上迁移时它工作正常

错误：

ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "category_id" referenced in foreign key constraint does not exist
: ALTER TABLE "uitems" ADD CONSTRAINT "fk_rails_a560038df0"
FOREIGN KEY ("category_id")
  REFERENCES "categories" ("id")

db schema：

//db/schema.rb

...
 create_table "categories", force: :cascade do |t|
    t.integer  "user_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.string   "name"
  end

  add_index "categories", ["user_id"], name: "index_categories_on_user_id"

  create_table "categorizations", force: :cascade do |t|
    t.integer  "uitem_id"
    t.integer  "category_id"
    t.integer  "position"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
  end

  add_index "categorizations", ["category_id"], name: "index_categorizations_on_category_id"
  add_index "categorizations", ["uitem_id"], name: "index_categorizations_on_uitem_id"

create_table "uitems", force: :cascade do |t|
    t.integer  "user_id"
    t.integer  "article_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "uitems", ["article_id"], name: "index_uitems_on_article_id"
  add_index "uitems", ["user_id"], name: "index_uitems_on_user_id"


...

我的模特：

//models/category.rb

class Category < ActiveRecord::Base
  has_many :categorizations
  has_many :uitems, :through => :categorizations,
           :class_name => "Uitem",
           :source => :uitem
  belongs_to :user
end


//models/categorization.rb

class Categorization < ActiveRecord::Base
  belongs_to :uitem
  belongs_to :category
end

 //models/uitem.rb

  belongs_to :user
  belongs_to :article
  has_many :categorizations
  has_many :categories, :through => :categorizations,
           :class_name => "Category",
           :source => :category
  has_many :opinions
  has_many :conversations

你找到了不寻常的东西吗？感谢你能给我的所有帮助

编辑：

问题解决了，我有一个旧的迁移，我要求添加一个外键（奇怪的是，迁移在sqlite上工作正常）thx guys

外键约束中引用的Postgresql列不存在

0 个答案: