Mysql2 ::错误：表'query_app_development.queries'不存在：显示来自`查询的完整字段

Question

控制器

class QueriesController < ApplicationController
    before_action :authenticate_user!

    def new
        @query = Query.new      
    end

    def create
        @query = Query.new
        @query.query_string = params[:query][:query_string]

        respond_to do |format|
            format.js{} 
        end
    end    
end

模型

class Query < ActiveRecord::Base


    include ActiveModel::Model

    attr_reader :query_result, :query_string

    def query_string=(query_str)
        @query_string = query_str
        establish_connection :readonly_db
         @query_result = ActiveRecord::Base.connection.execute(query_str)
    end
end

schema.rb

ActiveRecord::Schema.define(version: 20151029054443) do

  create_table "readonly_dbs", force: :cascade do |t|
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "users", force: :cascade do |t|
    t.string   "name",               limit: 255
    t.string   "email",              limit: 255, default: "", null: false
    t.string   "encrypted_password", limit: 255, default: "", null: false
    t.datetime "created_at",                                  null: false
    t.datetime "updated_at",                                  null: false
  end

  add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree

end

的database.yml

readonly_db:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: #somedatabase
  pool: 5
  username: readonly_user
  password: password
  socket: /var/run/mysqld/mysqld.sock

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: root
  socket: /var/run/mysqld/mysqld.sock

development:
  <<: *default
  database: query_app_development


test:
  <<: *default
  database: query_app_test


production:
  <<: *default
  database: query_app_production
  username: query_app
  password: <%= ENV['QUERY_APP_DATABASE_PASSWORD'] %>

这是我正在创建的应用程序，如查询浏览器。 但它抛出一个错误，说“Mysql2 :: Error：Table'query_app_development.queries'不存在：显示来自queries的完整字段”

“QueriesController中的ActiveRecord :: StatementInvalid #new”