使用rake任务重置和重新播种数据库

分类：编程问答

如何解决使用rake任务重置和重新播种数据库

使用下面的代码重置和重新设置数据库

task init: [:environment,'db:migrate:reset','db:seed']

db:seed创建了几个用户和几个对象。它还会为少数用户更新role。

db:seed引发以下错误NoMethodError: undefined method 'role' for User。

有一个迁移文件，它将role列添加到User表中。

无法解决此问题。尝试为db:seed编写单独的任务。尝试过以下

task init: [:environment,'db:seed'] do
  Rake::Task['db:seed'].invoke
end

与以前相同的error。为什么迁移文件中的column没有为db:seed加载，或者我在这里丢失了某些内容？

错误日志：

NoMethodError: undefined method `role' for #<User:0x00007fd5ecb239e0>
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activemodel-6.0.3.2/lib/active_model/attribute_methods.rb:432:in `method_missing'
/Users/Desktop/rails_app/app/models/user.rb:17:in `update_role'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:428:in `block in make_lambda'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:200:in `block (2 levels) in halting'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:605:in `block (2 levels) in default_terminator'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:604:in `catch'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:604:in `block in default_terminator'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:201:in `block in halting'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:513:in `block in invoke_before'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:513:in `each'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:513:in `invoke_before'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:134:in `run_callbacks'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/callbacks.rb:825:in `_run_validation_callbacks'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activemodel-6.0.3.2/lib/active_model/validations/callbacks.rb:117:in `run_validations!'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activemodel-6.0.3.2/lib/active_model/validations.rb:337:in `valid?'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/validations.rb:68:in `valid?'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/validations.rb:84:in `perform_validations'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/validations.rb:53:in `save!'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:318:in `block in save!'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:375:in `block in with_transaction_returning_status'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `block in transaction'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activesupport-6.0.3.2/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:212:in `transaction'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:366:in `with_transaction_returning_status'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/transactions.rb:318:in `save!'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/suppressor.rb:48:in `save!'
/Users/Desktop/.rvm/gems/ruby-2.7.1/gems/activerecord-6.0.3.2/lib/active_record/persistence.rb:55:in `create!'
/Users/Desktop/rails_app/app/services/init_data:6:in `process'
/Users/Desktop/rails_app/db/seeds.rb:3:in `<main>'

解决方法

使用 Select * from [Frs_def_businessobjectlayouts] where Definition like '%Open In Parent%' AND name like 'Task.ResponsiveAnalyst' 解决了该问题。即

  #new
import turtle
import random
import time
import winsound
import tkinter
import os
delay = 0.1

#score
score = 0
lifes = 5
#pause
p = turtle.Turtle()
p.speed(0)
p.shape('square')
p.color('black')
p.penup()
p.ht()
p.goto(200,270)
p.write('Press p to pause .',align='center',font=('courier',15,'bold'))
  

#lifes
life = turtle.Turtle()
life.speed(0)
life.shape('square')
life.color('blue')
life.penup()
life.ht()
life.goto(-240,270)
life.write('Lives: 5','bold'))
#hole
hole = turtle.Turtle()
hole.speed(0)
hole.color('orange')
hole.penup()

#screen
wn = turtle.Screen()
wn.title('Game')
wn.bgcolor('orange')
wn.setup(width = 600,height = 600)
wn.tracer(0)

 #restart
def restart():
    exec(open("C:/Users/liamh/Desktop/newone.py ").read())
    turtle.Screen().clear()

wn.onkeypress(restart,'r')
#score
pen = turtle.Turtle()
pen.speed(0)
pen.shape('square')
pen.color('green')
pen.penup()
pen.ht()
pen.goto(0,270)
pen.write('Score: 0',21,'bold'))

#sprite1
sprite1 = turtle.Turtle()
sprite1.speed(0)
sprite1.shape('triangle')
sprite1.color('red')
sprite1.penup()
sprite1.goto(10,0)
sprite1.direction = 'stop'

#boundries
mypen = turtle.Turtle()
mypen.penup()
mypen.setposition(-280,-280)
mypen.pendown()
mypen.pensize(3)
for side in range(4):
    mypen.forward(550)
    mypen.left(90)
mypen.hideturtle()

#food
s = turtle.Turtle()
s.speed(0)
s.shape('square')
s.color('red')
s.penup()
s.goto(0,100)

#functions
speed = 1

def turnr():
    sprite1.right(30)

def turnl():
    sprite1.left(30)

wn.onkeypress(turnr,'Right')

wn.onkeypress(turnl,'Left')

wn.update()
#game ending/timer
paused = False

def toggle_pause():
    global paused
    if paused == True:
        paused = False
    else:
        paused = True
wn.listen()
wn.onkeypress(toggle_pause,'p')
  
#MAIN LOOP
while True:
    if not paused:   
        sprite1.forward(speed)
        wn.update()
    else:
        wn.update()

        #boundrary
    if sprite1.xcor()> 270 or sprite1.xcor()< -270:
            winsound.PlaySound('C:/Users/liamh/Downloads/smb_bump.wav',winsound.SND_ASYNC)
            sprite1.right(180)
                
            delay -= 0.01
            lifes -= 1
            life.clear()
            life.write('Lives: {}'.format(lifes),'bold'))
      
        
    elif sprite1.ycor()> 270 or sprite1.ycor()< -270:
        winsound.PlaySound('C:/Users/liamh/Downloads/smb_bump.wav',winsound.SND_ASYNC)  
        sprite1.left(180)
        delay -= 0.01
        lifes -= 1
        life.clear()
        life.write('Lives: {}'.format(lifes),'bold'))
      
    #check collision
    if sprite1.distance(s) < 20:
        speed += 0.05
        #move random
        winsound.PlaySound('C:/Users/liamh/Downloads/smb_coin.wav',winsound.SND_ASYNC)
        x = random.randint(-250,250)
        y = random.randint(-250,250)
        s.goto(x,y)

        delay -= 0.001
        score += 1

        pen.clear()
        pen.write('Score: {}' .format(score),'bold'))
        
        wn.update()

    elif lifes == 0:
        
        
        #end game
        wn.update()
        
        end = turtle.Turtle()
        
        end.speed(0)
        end.shape('square')
        end.color('black')
        end.penup()
        end.ht()
        end.goto(0,0)
        end.write('GAME OVER! Score: {}' .format(score),24,'bold'))
        sprite1.goto (0,60)
        speed = 0
        wn.update()
        #restart
        def restart():
            wn.clear()
            exec(open("C:/Users/liamh/Desktop/newone.py ").read())
            

        wn.onkeypress(restart,'r')
        re = turtle.Turtle()
        re.speed(0)
        re.shape('square')
        re.color('black')
        re.penup()
        re.ht()
        re.goto(0,-25)
        re.write('Press r to restart','bold'))

            
wn.mainloop()

db:reset执行db:reset。 task init: [:environment,'db:reset'] 执行db:drop,db:setup，而db:setup执行db:schema:load。并且db:migrate:reset比db:migrate快。

不确定为什么db:schema:load会导致问题。

正如Sergio所建议的db:migrate可能是原因。他在comments db:migrate中的建议将载入所有列。

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