I'm trying to get all of the stocks that a user has. A user has stocks for different companies, so each line of the this table (Portfolio) you have the user_id company_id and the amount. So a user *has_many* portfolios. There is a way that I can get all of the *amounts* together ? Something that I can substitute the .first ? Something like .all ? Here is the code
<%= current_user.portfolio.**first**.amount %>
2 thoughts on “There is an action for that?”
I’m assuming you meant `portfolios` as you mentioned it is a *has_many*.
You would want to use [pluck](http://apidock.com/rails/ActiveRecord/Calculations/pluck).
`<%= current_user.portfolios.pluck(:amount) %>`
This functions just as you would expect [map](http://apidock.com/ruby/Enumerable/map) to work, but is faster.
When using `map` on ActiveRecord relations, all table data is fetched for each object in the relation, and a model for each row is instantiated before the desired column values are gathered.
On the other hand, `pluck` will only fetch the values for the desired column from the table, and no models are instantiated.
Did you want to calculate the totals of all *amount* values for all portfolios for the user?