discourse/lib/guardian/category_guardian.rb

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#mixin for all guardian methods dealing with category permisions
module CategoryGuardian
# Creating Method
def can_create_category?(parent)
is_admin? || (SiteSetting.allow_moderators_to_create_categories && is_moderator?)
end
# Editing Method
def can_edit_category?(category)
is_admin?
end
def can_delete_category?(category)
is_admin? &&
category.topic_count == 0 &&
!category.uncategorized? &&
!category.has_children?
end
def can_see_category?(category)
not(category.read_restricted) || secure_category_ids.include?(category.id)
end
def secure_category_ids
@secure_category_ids ||= @user.secure_category_ids
end
# all allowed category ids
def allowed_category_ids
unrestricted = Category.where(read_restricted: false).pluck(:id)
unrestricted.concat(secure_category_ids)
end
def topic_create_allowed_category_ids
@topic_create_allowed_category_ids ||= @user.topic_create_allowed_category_ids
end
end