Calling method from view Rails 4

Question

how can i call the method get_data from my view index.html.erb?

class CalculationController < ApplicationController def index #------------------Module1-----------------------------------------

      #From json to hash - consumption_profile_generic 
      file_gen = File.read("consumption_profile_generic_some_columns.js") 
  @data_hash_gen = JSON.parse(file_gen) 

  #Passing variable introduced by the user in mod1
  @user_entry_module1 = params[:user_entry_module1]

  # Filtering date and consumption_% ind 2 vectors and then merging them
  num = @data_hash_gen.count 
  @vectorA = Array.new
  @vectorB = Array.new
  i = 0
  while num > i
      @vectorA[i] = @data_hash_gen[i]["consumption_%"].to_f * @user_entry_module1.to_i
      @vectorB[i] = @data_hash_gen[i]["date"]
      i += 1
  end

  @vectorC = @vectorB.zip(@vectorA)   

end

def get_data
      @cuca = 2

end

end

I want that the variable @cuca will be printed on the screen.

Possible duplicate of [Can we call a Controller's method from a view (as we call from helper ideally)?](https://stackoverflow.com/questions/8906527/can-we-call-a-controllers-method-from-a-view-as-we-call-from-helper-ideally) — Jon Schneider, Mar 19 '19 at 17:49

Rajdeep Singh · Accepted Answer · 2015-05-18T14:33:01.563

3

Make it a helper method, add this line to the controller

helper_method :get_data

Then in the view you can write <%= get_data %> to show the value stored in @cuca variable.

Hope this help!

edited May 18 '15 at 14:33

answered May 18 '15 at 14:22

Rajdeep Singh

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And how can i call it from my view? <% get_data %> <%= @cuca %> ? – May 18 '15 at 14:28
This should set `@cuca` to 2, and then you show the value of `@cuca`, so your code above should just render out "2". – Max Williams May 18 '15 at 14:29
Use `<%= get_data %>` in the view, I have edited the answer, check it! – Rajdeep Singh May 18 '15 at 14:33

score 0 · Answer 2 · answered May 18 '15 at 14:28

Assuming that your app doesn't have a route for your get_data method, you should just move it to a model (i.e. Calculation) as a class or instance level method.

You can then set the value in an instance variable in your index action and use it in your view.

Calling method from view Rails 4

2 Answers2