Rails设计角色模型& CanCanCan定义能力
Rails设计角色模型& CanCanCan定义能力
提问于 2015-09-02 06:02:32
我试图在CanCanCan中定义能力。
我搞不懂要开始的语法。
我使用角色模型作为我的角色，角色在我的Profile.rb中定义。Profile.rb属于User.rb。
我正在试着检查用户是否有这个角色:学生。
当我尝试：
if {user_signed_in?, user.profile.has_role? :student}我收到一个语法错误，上面写着：
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，上面写着：
syntax error, unexpected tSYMBEG, expecting =>
if {user_signed_in? && user.profile.has_role? :student}我还试着用普通括号替换花括号，并将它们全部去掉。
当我尝试删除设计部分(user_signed_in)并使用下面的注释中的建议时，我尝试：
if user.profile.has_role?(:student) 我得到了一个错误：
undefined method `has_role?' for nil:NilClass当我尝试：
if user.profile.has_role? :student 我知道这个错误：
undefined method `has_role?' for nil:NilClass当我尝试：
if user.profile.has_role?(student) 我知道这个错误：
undefined local variable or method `student' for #<Ability:0x007fd034a78968>我在我的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我没有任何错误，但我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 ' can‘语句中的每个语句中，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的第一部分贴在下面(有很多角色和能力，所以我还没有贴上整件东西)。
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(以下建议)时：
if user.try(:profile).present? && user.profile.has_role? :student 我知道这个错误：
syntax error, unexpected tSYMBEG, expecting keyword_then or ';' or '\n'
...nt? && user.profile.has_role? :student有人能看出我做错了什么吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-09-02 06:36:30
用于下列代码
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{}作为ruby语句，它需要一个键值对。您可以按照以下方式重写代码
if user_signed_in? && user.profile.has_role? :student但是您正在获得一个空指针错误，所以您在代码中已经修复了它，如下所示，首先检查user.try(:profile).present?是否可以调用user.profile.has_role? :student，因为您的profile获得了nil。
if user.try(:profile).present? && user.profile.has_role?(:student)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32345660
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