ActiveModel Serializer - Passing Params To Serializers
Answer : AMS version: 0.10.6 Any options passed to render that are not reserved for the adapter are available in the serializer as instance_options . In your controller: def index @watchlists = Watchlist.belongs_to_user(current_user) render json: @watchlists, each_serializer: WatchlistOnlySerializer, currency: params[:currency] end Then you can access it in the serializer like so: def market_value # this is where I'm trying to pass the parameter Balance.watchlist_market_value(self.id, instance_options[:currency]) end Doc: Passing Arbitrary Options To A Serializer AMS version: 0.9.7 Unfortunately for this version of AMS, there is no clear way of sending parameters to the serializer. But you can hack this using any of the keywords like :scope (as Jagdeep said) or :context out of the following accessors: attr_accessor :object, :scope, :root, :meta_key, :meta, :key_format, :context, :polymorphic Though I would prefer :context over :scope for the p...