-4
如何使其工作?轨道控制器索引渲染验证
books_controller.rb:
1)
def index
@books = Book.where(library_id.present?)
end
2)
def warsaw_books
@books = Book.where(city == 'Warsaw')
end
如何使其工作?轨道控制器索引渲染验证
books_controller.rb:
1)
def index
@books = Book.where(library_id.present?)
end
2)
def warsaw_books
@books = Book.where(city == 'Warsaw')
end
1)查找记录,其中library_id
不是nil:
def index
@books = Book.where.not(library_id: nil)
end
2)查找记录city
是'Warsaw'
:
def warsaw_books
@books = Book.where(city: 'Warsaw')
end
http://guides.rubyonrails.org/active_record_querying.html – Iceman