我有一个属于document.rb的权限表，而文档属于workstream.rb
<% @permissions.each do |p| %>
<% if current_user.workstream === p.document.workstream %>
# all the values that are true to this condition should be captured in an array or .where sort of return array
<% end %>
<% end %>
请我如何捕获数组中满足if条件的值并计算值。
因此将当前用户工作流中具有相同文档的所有权限存储在数组中并计数
class Permission < ApplicationRecord
extend FriendlyId
friendly_id :id, use: :slugged
belongs_to :user
belongs_to :document
enum status: [:request, :approved, :rejected]
end
class Document < ApplicationRecord
extend FriendlyId
friendly_id :doc_uuid, use: :slugged
mount_uploader :doc_resource_url, DocumentUploader
before_save :generate_token
belongs_to :workstream
has_one :document_meta
belongs_to :state
has_many :permissions
end
class Workstream < ApplicationRecord
extend FriendlyId
friendly_id :fullname, use: :slugged
belongs_to :unit
belongs_to :state
belongs_to :project
has_many :documents
has_many :user_workstreams
has_many :users, through: :user_workstreams
validates_uniqueness_of :workstream_code
end
错误消息
2.4.0 :026 > Permission.joins(document: {workstream: {id: 1}})
ActiveRecord::ConfigurationError: 1
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:70:in `walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:67:in `block in walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `each'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:67:in `block in walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `each'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:67:in `block in walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `each'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:65:in `walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:62:in `block in walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:61:in `each'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:61:in `walk_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:52:in `make_tree'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/associations/join_dependency.rb:97:in `initialize'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activerecord-5.0.7/lib/active_record/relation/query_methods.rb:1071:in `new'
... 9 levels...
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/railties-5.0.7/lib/rails/commands/console_helper.rb:9:in `start'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/railties-5.0.7/lib/rails/commands/commands_tasks.rb:78:in `console'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/railties-5.0.7/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/railties-5.0.7/lib/rails/commands.rb:18:in `<top (required)>'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `block in require'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require'
from /Users/chineduabalogu/work/HSDF_DHUB/bin/rails:9:in `<top (required)>'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `load'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `block in load'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/chineduabalogu/.rvm/gems/ruby-2.4.0/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `load'
from /Users/chineduabalogu/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/chineduabalogu/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'