Based on railstutorials.org, I've written my method to check whether it is 
admin or not inside sessions_helper.rb. Now in model I've to insert data to 
temporary table lets assume "*user_temp_table*", if it is normal user that 
has logged in. Later those entries will be approved by admin. If it is 
admin himself logged in I want to insert data to permanent table lets 
assume "*admin_table".*

Now where is the best place to call admin checking method which I have 
written inside sessions_helper.rb.
I have two possibilities.

1. Set a flag to 1 or 0 inside controller and access that flag variable 
from model if it is admin or user respectively.
Problem: But I found some blogs and stackoverflow posts stating that 
controller is just a bridge between view and model. And variables inside 
controller should not be accessed from model. Addition to that I don't know 
how to access controller variable from model. If this is the method please 
tell me how?

2. include SessionHelper inside model and call the method.

But posts I found related to both of these solutions are very old. So in 
rails 4 which is the valid and good way to carry out this task? Or is there 
is any other new way?

Thank you.

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