無法設置布爾值，當從CSV導入數據到PostgreSQL

Question

我建立了一個任務可以導入這樣的數據：

CSV.foreach(file, :headers => true) do |row| 
    question = Question.new ({ 
    content: row[0], 
    mark:  row[1], 
    topic_id: row[2], 
    question_type_id: row[3], 
    answers_attributes: [ 
    { content: row[5], correct: row[6] }, 
    { content: row[7], correct: row[8] } 
    ] 
}) 
question.user_id = row[4] 
question.save! 

這是我的CSV文件：

content, mark, topic_id, question_type_id, user_id, content, correct, content, correct 
_____ are people involved in or affected by project activities, 5, 16, 1, 3, True, 't', False, 'f' 

但是，當我運行導入任務，correct attribute總是在數據庫中是FALSE，我試過用PostgreSQL的Boolean Data Type，但是沒有工作。我錯了什麼？

Answer 1

我發現這個問題。這是csv文件有問題：

content, mark, topic_id, question_type_id, user_id, content, correct, content, correct 
_____ are people involved in or affected by project activities, 5, 16, 1, 3, True, 1, False, 0 

這裏的問題是布爾列值的前面的空格。在上面的csv文件中，True, 1之間的空間出現問題。當csv文件導入到數據庫時，它包含1前面的空格，所以導入的值爲：" 1"，而不是"1"，所以postgresql無法識別帶空格的值。我以前它去掉了空間，而且現在的工作，這是我正確的csv文件（我刪除了所有的空間）：

content,mark,topic_id,question_type_id,user_id,content,correct,content,correct 
_____ are people involved in or affected by project activities,5,16,1,3,True,1,False,0 

這也許幫助，所以如果有在CSV文件空間和我一樣的問題。

Answer 2

嘗試更換真/假與真/假

1.9.3-p194 :006 > True 
NameError: uninitialized constant True 
from (irb):6 
from /Users/SAdvincula/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>' 
1.9.3-p194 :007 > true 
=> true 

Answer 3

更改您的CSV文件

content, mark, topic_id, question_type_id, user_id, content, correct, content, correct 
_____ are people involved in or affected by project activities, 5, 16, 1, 3, True, '1', False, '0'