Question

我命名了一个表Types，并意识到它是一个保留字，所以我将其重命名为'Category`。

现在，当我尝试执行ActiveRecord查询时，出现此错误：

PG::UndefinedTable: ERROR:  relation "categories" does not exist
LINE 5:                WHERE a.attrelid = '"categories"'::regclass
                                          ^
:               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
                FROM pg_attribute a LEFT JOIN pg_attrdef d
                  ON a.attrelid = d.adrelid AND a.attnum = d.adnum
               WHERE a.attrelid = '"categories"'::regclass
                 AND a.attnum > 0 AND NOT a.attisdropped
               ORDER BY a.attnum

我已经回过去了所有的代码，并改变了所有的关系名称，模型，控制器等......但我不知道这个错误来自哪里。或者它意味着什么。这是我的category.rb：

class Category < ActiveRecord::Base
has_many :projects

end

这里是categories_controller.rb： class CategoriesController＆lt; ApplicationController中

        def create
            @category = Category.new(category_params)
            if @category.save
                redirect_to root_path
            else
                redirect_to({:controller => 'application', :action => 'home'}, :notice => 'Account not created! Something is fishy.')
            end
        end

end

以下是我在用户模型中尝试做的事情（因为我希望代码沿着current_user.contributions_by_category

的行读取

def contributions_by_category(array)
    category = {}
        array.each do |subarray|
            name = Category.find(subarray[1].category_id).project_category;
            category[name] = 0 unless category.include?(name)
            category[name] += subarray[0] unless subarray[0] == nil
        end
    category
    end

另外，在我的项目模型中，我有：

class Project < ActiveRecord::Base
    belongs_to :user, :foreign_key => 'user_id'
    belongs_to :category, :foreign_key => 'category_id' #should change this to a has one association
    has_many :users
    has_many :payments
    has_many :updates
    has_many :comments
    has_one :imapct 

....

end

在我切换名称之前，我能够使这个查询在rails控制台中工作并将其渲染到屏幕上，因此关系存在，我所做的就是更改名称。

感谢任何帮助！

更新：

这是来自rails console的表数据：

   List of relations
 Schema |       Name        | Type  |    Owner    
--------+-------------------+-------+-------------
 public | categories        | table | seinnaidess
 public | comments          | table | seinnaidess
 public | entrepreneurs     | table | seinnaidess
 public | impacts           | table | seinnaidess
 public | payments          | table | seinnaidess
 public | projects          | table | seinnaidess
 public | schema_migrations | table | seinnaidess
 public | update_comments   | table | seinnaidess
 public | updates           | table | seinnaidess
 public | users             | table | seinnaidess

这是我的架构：

ActiveRecord::Schema.define(version: 20150930040619) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "categories", force: :cascade do |t|
    t.string "category_type"
  end

  create_table "comments", force: :cascade do |t|
    t.text     "content"
    t.integer  "user_id"
    t.integer  "project_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "entrepreneurs", force: :cascade do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "password_digest"
    t.text     "about"
    t.string   "location"
    t.integer  "age"
    t.float    "repayment_rate"
    t.integer  "project_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "impacts", force: :cascade do |t|
    t.integer  "ppl_hired",            default: 0
    t.integer  "ppl_schooled",         default: 0
    t.integer  "improved_housing",     default: 0
    t.integer  "improved_nourishment", default: 0
    t.integer  "improved_medical",     default: 0
    t.integer  "community_resource",   default: 0
    t.integer  "project_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "payments", force: :cascade do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.float    "amount"
    t.integer  "cc_num"
    t.integer  "exp_month"
    t.integer  "exp_year"
    t.integer  "cvs"
    t.integer  "user_id"
    t.integer  "project_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.text     "comments"
  end

  create_table "projects", force: :cascade do |t|
    t.string   "name"
    t.text     "url"
    t.text     "description"
    t.float    "money_needed",     default: 0.0
    t.float    "money_raised",     default: 0.0
    t.float    "interest_offered", default: 0.0
    t.datetime "end_date"
    t.integer  "category_id"
    t.integer  "user_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "update_comments", force: :cascade do |t|
  end

  create_table "updates", force: :cascade do |t|
    t.text    "content"
    t.string  "url"
    t.integer "project_id"
    t.string  "date"
  end

  create_table "users", force: :cascade do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "user_name"
    t.string   "password_digest"
    t.string   "impact"
    t.text     "pic_url"
    t.text     "quote"
    t.integer  "payment_id"
    t.integer  "project_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.boolean  "admin"
  end

重命名一个表，我收到错误

0 个答案: