How to include conditional in mailer layout for mailer method? - ruby-on-rails

I am designing a mailer layout in Rails. It's a general layout that different mailers will use. In the middle of the general layout, there's a link I want to include but only if it's user_mailer.rb with the method def account_activation(user) that is sending email. Is there a way to do this?
In the layout I tried:
<% if mailer_name == 'user' && ['account_activation'].include?(action_name) %>
but this generated the error:
undefined local variable or method 'mailer_name' for #<#<Class:0x007f18d0701f30>:0x00000006109c70>
If I change mailer_name to mailer it no longer generates an error but it doesn't display the link either (even though I'm looking at the preview for the account_activation method.

In your layout, in the footer section put something like this:
<div id='footer'>
copyright | terms | privacy
<% if content_for?(:footer) %>
|
<%= yield :footer %>
<% end %>
</div>
Then in your specific mailer view do this:
<% content_for :footer do %>
special link
<% end %>
I do this to add special notes in the footer of emails that vary from email to email. Works great.

Related

Moving rails from to from _form.html.erb to application.html.erb

I have most of the functionality done for a site. Now I am trying to make it look nice. I have a _form.html.erb that works great.
<%= form_for(#card) do |f| %>
<% if #card.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#card.errors.count, "error") %> prohibited this card from being saved:</h2>
<ul>
<% #card.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :event %><br />
<%= f.text_field :event %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
Files
view
- cards
-- new.html.erb
-- index.html.erb
-- show.html.erb
- layouts
-- application.html.erb
- pages
-- index.html.erb
I make a call for the form from new.html.erb and it works sends it to show.html.erb, just as I want. I'm using bootstrap and decided to make use of the nav bar. I have placed the nav bar code into the application.html.erb. It works just fine, well kind of. I want what would normally be a search function to be the add a new card.
When I add the form call it does not work, when I add it directly to the application page it does not work. I'm not sure, I have spent hours on this. I got it to work only on the show.html.erb page, both index pages would error out. I honestly don't remember how I did this though.
I'm trying to learn by doing, but I am stuck and need some help.
Thank you,
Ian
I guess that when you say that its working in your new.html.erb you have a new action inside your cards_controller, and inside this action you have something like: #card = Card.new
Well, if you want to put this form in another view, like in the application.html.erb you need to set first your #card variable, so you can do something like:
# application_controller:
before_filter :new_card
def new_card
#card = Card.new
end
be aware that all the controller that inherits from application controller will set this #card variable
#instance_variable
The underlying problem here is that you're calling a partial - by design, these are meant to give you the ability to call the functionality the file contains anywhere in your application
The problem you have is you're referencing an #instance_variable directly in your partial.
This isn't normally an issue - if you're using partials like you were originally (to modularize views), it should be okay. The problems arise when you try and use the partials in a more generalized way, as you are doing now:
#app/views/controller/_form.html.erb
<%= form_for(#card) do |f| %>
This relies on the #card instance variable being made available, which won't be if you're loading the partial in any other controller than the cards_controller.
--
Fix
The way to fix this is to either populate the #card instance variable in the application controller (as described by edymerchk), or to pass the raw value through the locals hash of the partial call:
This will allow you to use the card local variable in your partial:
#app/views/controller/_form.html.erb
<%= form_for card do |f| %>
-
Alternatively, you could also set the #card instance variable, as recommended in another answer:
#app/controllers/application_controller.rb
Class ApplicationController < ActionController::Base
before_action :set_card
private
def set_card
#card = Card.new
end
end

How Do I "Extend" a view in Rails

So I'm working on an open source project and due to different versions, there's the issue where I can't count on there being a controller for a view. Instead this email would be send out via a rake task for one version and a few others would done via a controller. Now you understand why I'm asking a bad practice question...
I have a layout for a view. Does anyone know a way to specify what the layout is for the view within the view. Some pseudo-code:
<%= extends 'layout/test_mailer` %>
<h1> Hey there! </h1>
And the layout would have the usual yield within it.
I hope I'm explaining the problem good enough.
<%= render partial: "hey_page", layout: "layout/test_mailer" %>
Check part 3.4.3 Partial Layouts at RailsGuides.
I think using yield and content_for should solve the problem. [Guides]
# my_layout.html.erb
<%= yield :mail_view %>
# my_mail_view.html.erb
<%= content_for :mail_view do %>
<!-- html -->
<% end %>
Of-course, if you are using params to get the layout, this would be a wrong answer.
Then, you can also use:
<%= render partial: "link_area", layout: "graybar" %>
You can use
//controller action
def index
render layout: test_mailer
end
//view, index.html.erb
<h1> Hey there! </h1>
//view, layout/test_mail.html.erb
<html>....layout for you test mail
<% yield %>
</html>

Change Devise Errors

In my application.html.erb file I have
<% flash.each do |key,msg| %>
<div class="message" id="<%= key %>">
<%= content_tag :div, msg %>
</div>
<% end %>
which shows all the notices. Is there a way to add Devise's error be viewed in that notice?
Also, is there a way I can edit the HTML code when there is an error.
When there is an error, it adds a div with an id field_with_errors — can I change that?
I don't know if it's what your looking for, but the config/locales/devise.en.yml allows you to change the content of the messages.
rails generate devise:views will copy Devise's views to your app so you can edit them freely.
https://github.com/plataformatec/devise#configuring-views

is it possible to access value from a model databasetable in the application.html.erb?

im trying to make a app
with users
this users can join multiple groups - every group has the same menu on the page
their group page is accessable about group/1 or group/2
so i wanted to put the the menu in the application.html.erb, with lnks depending on the group.id - but i dont know how to acces this id in the application.html.erb
This is often done using content_for in the layout. Let's say you want your menu in a certain div in application.html.erb:
# application.html.erb
<div id="menu_div>
<ul>
... etc ...
</ul>
</div>
Replace the inner content with a yield statement:
<div id="menu_div>
<%= yield :group_menu %>
</div>
Then in the view template add the content_for block:
# page
<% content_for :group_menu do %>
<ul>
... etc ...
</ul>
<% end %>
Each page template can then define its own menu code in a content_for block. This can be further generalized by using a helper method in the block and passing in instance variables.
EDIT
Assuming #group is assigned in the controller, you might do something like:
<% content_for :group_menu do %>
<%= show_me_the_menu(#group) %>
<% end %>
and in the helper (obviously contrived example):
def show_me_the_menu(group)
content_tag :ul do
group.users.collect do |user|
concat(content_tag(:li, user.some_method))
end
end
end
The correct approach would be to set this in ApplicationController via before_filter and just use it as an instance variable in views.
So in controller set something like #links = some logic where you calculate your links based on current user.
In view you do something like:
<ul>
<%- for link in #links -%>
<li><%= link.title =>
<%- end -%.
</ul>
Of course, you set your #links in ApplicationController only if you want your links to be available to all your controllers/views, which I think you do.
Rails Cells could also be used here http://cells.rubyforge.org/
i solved my problem in a different way now. i created in the group model a "menu" and this i render partial in the application.html.erb

Rails check if yield :area is defined in content_for

I want to do a conditional rendering at the layout level based on the actual template has defined content_for(:an__area), any idea how to get this done?
#content_for_whatever is deprecated.
Use content_for? instead, like this:
<% if content_for?(:whatever) %>
<div><%= yield(:whatever) %></div>
<% end %>
not really necessary to create a helper method:
<% if #content_for_sidebar %>
<div id="sidebar">
<%= yield :sidebar %>
</div>
<% end %>
then of course in your view:
<% content_for :sidebar do %>
...
<% end %>
I use this all the time to conditionally go between a one column and two column layout
<%if content_for?(:content)%>
<%= yield(:content) %>
<%end%>
Can create a helper:
def content_defined?(var)
content_var_name="#content_for_#{var}"
!instance_variable_get(content_var_name).nil?
end
And use this in your layout:
<% if content_defined?(:an__area) %>
<h1>An area is defined: <%= yield :an__area %></h1>
<% end %>
Ok I am going to shamelessly do a self reply as no one has answered and I have already found the answer :)
Define this as a helper method either in application_helper.rb or anywhere you found convenient.
def content_defined?(symbol)
content_var_name="#content_for_" +
if symbol.kind_of? Symbol
symbol.to_s
elsif symbol.kind_of? String
symbol
else
raise "Parameter symbol must be string or symbol"
end
!instance_variable_get(content_var_name).nil?
end
I'm not sure of the performance implications of calling yield twice, but this will do regardless of the internal implementation of yield (#content_for_xyz is deprecated) and without any extra code or helper methods:
<% if yield :sidebar %>
<div id="sidebar">
<%= yield :sidebar %>
</div>
<% end %>
I use #view_flow and value of the content method before checking if the content is present in the view like this:
#view_flow.content[:header_left_or_whatever_the_name_of_your_block_is].present?
Recently stumbled upon it when showing all local, global and instance variables of self in the console with byebug. I’m a fan using this because it’s straight from Rails, won’t throw an error, won’t hide anything w “Rails magic”, returns a definite true or false, + only checks the content in the current context of the view being rendered.
#view_flow is an instance attribute of ActionView::Context and because Action View contexts are supplied to Action Controller to render a template it will be available to any view that has been rendered by Rails. Although it checks for content, the content_for block will not be yielded if it isn’t there. So it’s been my perfect solution in similar situations.

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