我正在尝试在CanCanCan中定义能力。
我无法弄清楚入门的语法。
我为我的角色使用角色模型,角色在我的Profile.rb中定义。 Profile.rb属于User.rb。
我正在尝试检查用户是否具有角色:student。
当我尝试:
if {user_signed_in?, user.profile.has_role? :student}
我收到一个语法错误:
syntax error, unexpected ',', expecting =>
if {user_signed_in?, user.profile.has_role? :student}
当我尝试:
if {user_signed_in? && user.profile.has_role? :student}
我收到一个语法错误:
syntax error, unexpected tSYMBEG, expecting =>
if {user_signed_in? && user.profile.has_role? :student}
我也尝试用常规括号替换花括号并完全删除它们。
当我尝试删除设计部分(user_signed_in)并使用下面评论中的建议时,我尝试:
if user.profile.has_role?(:student)
我收到了这个错误:
undefined method `has_role?' for nil:NilClass
当我尝试:
if user.profile.has_role? :student
我收到此错误:
undefined method `has_role?' for nil:NilClass
当我尝试:
if user.profile.has_role?(student)
我收到此错误:
undefined local variable or method `student' for #<Ability:0x007fd034a78968>
我在profile.rb中定义了以下角色:
roles :admin, :manager, #
:student, :educator, :researcher, :ktp, :faculty_manager, :ip_asset_manager, # for universities
:sponsor, # for industry
:project_manager, :representative, # for both uni and industry
:grantor, :investor, :adviser, :innovation_consultant, :panel_member, # external
:participant, :guest # public
当我尝试:
can :crud, Profile, :user_id => user.id if user.profile.has_role? :student
我没有得到任何错误,但我这种方法的问题是学生可以做很多事情(有10行权限,所以我需要将if语句单独添加到10'中的每一个'语句,除非有一种方法可以在下一个'elsif'语句之前将if语句应用于所有行。
我的ability.rb的第一部分粘贴在下面(有很多角色和很多能力,所以我没有粘贴整个东西)。
class Ability
include CanCan::Ability
def initialize(user)
alias_action :create, :read, :update, :destroy, :to => :crud
# Define abilities for the passed in user here. For example:
#
user ||= User.new # guest user (not logged in)
#users who are not signed in can create registration or login
# can read publicly available projects, programs and proposals
can :read, Project, {:active => true, :closed => false, :sweep => { :disclosure => { :allusers => true } } }
# {:active => true, :closed => false && :Project.sweep.disclosure.allusers => true}
# if user role is student
can :crud, Profile, :user_id => user.id if user.profile.has_role? :student #[for themselves]
can :read, ProjectInvitation, {:student_id => @current_user && :expiry_date_for_students_to_claim_project > Time.now}
# can read project invitations addressed to them
# can read projects to which they are invited whilst the invite is available to accept;
can :read, Project, {} #if invited to the project?
# and they can create responses to invitations to those projects
can :update, ProjectInvitation.student_accepted
# they can create questions on those projects before the invite expiry date;
can :read, ProjectQuestion, {} #if intvited
can [:create, :update, :destroy], ProjectQuestion #if they created the question
can :read, ProjectAnswer #if its on a project they can see
# they can update term sheets and template agreements for those projects
can [:read, :update], TermSheet #{where created for project in which they are participating}
can [:read, :update], ProjectAgreement #{where created for a project in which they are participating}
can [:read, :update], FinanceAgreement #{where created for a project in which they are participating}
can [:read, :update], Nda #{where created for a project in which they are participating}
can [:create, :update], Feedback #{where created for a project in which they are participating and the feedback is on other project team members and the project is completed}
elsif user.profile.has_role? :educator
当我尝试时(下面的建议):
if user.try(:profile).present? && user.profile.has_role? :student
我收到此错误:
syntax error, unexpected tSYMBEG, expecting keyword_then or ';' or '\n'
...nt? && user.profile.has_role? :student
请有人看到我做错了吗?
答案 0 :(得分:0)
以下代码
if {user_signed_in?, user.profile.has_role? :student}
if {user_signed_in? && user.profile.has_role? :student}
if {user_signed_in? && user.profile.has_role? :student}
您不能使用{}
来获取ruby语句,它期望键值对。您可以按以下方式重写代码
if user_signed_in? && user.profile.has_role? :student
但是你得到一个空指针错误,所以你已经在你的代码中修改了它,如下所示,首先检查user.try(:profile).present?
是否可以调用user.profile.has_role? :student
,因为profile
获取nil
1}}。
if user.try(:profile).present? && user.profile.has_role?(:student)