Passing a variable to a partial - ruby-on-rails

Question

I know this has been asked before but I think I'm doing everything right and it still wont work.
I have a simple user table one to many with a relationship table. I just want to show the number of people following a selected user in a partial.
It works fine in the non partial view but I keep getting the error:
undefined method `name'
when I make the normal view into a partial and it highlights the focus of the error as being
def gravatar_for(user, size = 30, title = user.name)
which is fromm a helper method I use
the partial is here (called users/_show_follow ):
<% provide(:title, #title) %>
<div class="row">
<aside class="col-md-4">
<section class="user_info">
<%= gravatar_for user %>
<h1><%= user.name %></h1>
<span><%= link_to "view my profile", user %></span>
</section>
<section class="stats">
<%= render 'shared/stats' %>
<% if users.any? %>
<div class="user_avatars">
<% for user in users %>
<%= link_to gravatar_for(user, size: 30), user %>
<% end %>
</div>
<% end %>
</section>
</aside>
<div class="col-md-8">
<h3><%= #title %></h3>
<% if users.any? %>
<ul class="users follow">
<%= render users %>
</ul>
<%= will_paginate %>
<% end %>
</div>
</div>
The originating page for the partial:
<div class="container-fluid">
<div class="row-fluid">
<div class="col-md-8">
<div id="chart"><%= javascript_include_tag('graph') %></div>
</div>
<div class="col-md-2">
<p>
<h2>Node Score</h2>
<div id="FBDiv"></div>
<div id="chart_1"></div>
<h2>Node Profile</h2>
<div id="NodeProfile"></div>
<h2>My inner circle</h2>
<h2>Wants to connect</h2>
<h2>My profile</h2>
<%= current_user.about %>
<section class="stats">
<%= render 'shared/stats' %>
<%= render :partial => "show_follow", :locals => {:user => #user, :users => #users} %>
</section>
</section>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row">
<div class="col-md-4"></div>
</div>
</div>
the controller
class UsersController < ApplicationController
def index
#users = User.including_relationships
respond_to do |format|
format.html # index.html.erb
format.json { render json: #users }
end
end
def show
#user = User.find_by name: params[:name]
respond_to do |format|
# Here we need to remove the layout because the request
# is done via ajax and the layout is already loaded.
format.json { render json: #user.to_json }
end
end
def following
#title = "Following"
#user = User.find(params[:id])
#users = #user.followed_users.paginate(page: params[:page])
render 'show_follow'
end
def followers
#title = "Followers"
#user = User.find(params[:id])
#users = #user.followers.paginate(page: params[:page])
render 'show_follow'
end
end
the helper
module ApplicationHelper
def page_header(text)
content_for(:page_header) { text.to_s }
end
def gravatar_for(user, title = user.name, size = 30)
image_tag gravatar_image_url(user.email, size: size), title: title, class: 'img-rounded'
end
end
Is the problem how I pass the variable into the helper method from the partial?

Answer 1

As you pointed out the error is on your helper arguments: def gravatar_for(user, size = 30, title = user.name). user is not an object, it'simply the name of the argument, so user.name won't work.
Try setting a default title (1) or passing the title when you call the method (2):
def gravatar_for(user, size = 30, title = 'Default name')
<%= gravatar_for user, 20, user.name %>. To avoid passing the size each time you can reorder the arguments: def gravatar_for(user, title = user.name, size = 30) or use keyword arguments.