ruby on rails - Creating a feed => NoMethodError: undefined method for ActiveRecord_Associations_CollectionProxy -

i implementing feed of cards belonging tags user has subscribed , following error. it's trivial can't pinpoint needs work.

nomethoderror: undefined method `cards' tag::activerecord_associations_collectionproxy:0x007fbaa46239f8>

here models:

class user < activerecord::base   has_many :cards, dependent: :destroy   has_many :tags, through: :cards    has_many :subscriptions, dependent: :destroy    has_many :subscribed_tags, through: :subscriptions, source: :tag end class tag < activerecord::base   has_many :taggings, dependent: :destroy   has_many :cards, through: :taggings   has_many :subscriptions, dependent: :destroy   has_many :subscribers, through: :subscriptions, source: :user end class card < activerecord::base   acts_as_votable   belongs_to :user   has_many :taggings, dependent: :destroy   has_many :tags, through: :taggings       def self.tagged_with(name)     tag.find_by_name!(name).cards   end   def self.tag_counts     tag.select("tags.*, count(taggings.tag_id) count").     joins(:taggings).group("taggings.tag_id")   end   def tag_list      tags.map(&:name).join(", ")   end   def tag_list=(names)     self.tags = names.split(",").map |n|        tag.where(name: n.strip).first_or_create!     end   end end 

what trying run current_user.subscribed_tags.cards , retrieve array of cards can reorder , output timeline.

thanks

subscribed_tags - it's scope (where(user: self)), can call where or join on them not item methods.

in case want use scope

class card   scope :with_subscription, -> { joins(tags: :subscriptions) } end  # in controller current_user.cards.with_subscription.order('cards.created_at desc') 

you can imagine current_user.cards form of cards.where(user: current_user). once tell retrieve card array - cannot changed. cannot user.cards.subscriptions or user.where(id: user).cards.tags can it's filter.

next filter joins(:subscriptions). give inner join, cards belonged user have subscriptions. , it's scope can modify further passing example order.

activerecord join associations