我无法使Active Record简单查询

Question

This:

User.where 'id < ?', 5

fails with this message:

NoMethodError: undefined method `join' for #<Class:0x007fa4c9b5a598>

When I try:

User.where 'id < 5'

it works.

In another project:

User.where 'id < ?', 5

works.

Where could be my problem?

Update

I could solve the problem but commenting a gem:

# gem 'cancan'

Working flow

Then when I run console, I get:

load error: ~/.irbrc
NameError: uninitialized constant ApplicationController::CanCan

And my simple query works.

Not working flow

Then I comment CanCan part of application controller and console starts without problems, but when I try my simple query it fails with the same error.

What I am trying now

Searching for join in ~/.irbrc , I got several results. But I am not sure of what I am doing.

Where could be my problem?

Answer 1

Not really an answer to your question, but I personally try to use as little straight SQL as possible in my code.

Check out the squeel gem, which will help with this, especially this kind of query. https://github.com/ernie/squeel

Answer 2

I had this snippet in my ~/.irbrc

203   # instead of User.find(...) you can do user(...)
204   #   without arguments it only returns the model class
205   #   based on http://www.clarkware.com/blog/2007/09/03/console-shortcut
206 #  Dir.glob( File.join(Dir.pwd, *%w<app models ** *.rb>) ).map { |file_name|
207 #    table_name = File.basename(file_name).split('.')[0..-2].join

I commented all the block and now it works. Well, I copied that file and never have understood it.