Is it possible to make small changes in different views?
The same partial is rendered in index.html.erb and show.html.erb as below.
index.html.erb
<%= render #schedules %>
show.html.erb
<%= render #schedules %>
What I'd like to do is not to display some value in the index.html.erb. (and display some value in both erb)
For example, I'd like to display start_at and end_at only in show.html.erb and display title in both erb.
_schedule.html.erb
<% schedule.rooms.each_with_index do |a, idx| %>
<% a.events.each do |e| %>
<%= l(e.start_at) %>-<%= l(e.end_at) %> # display only show.html.erb
<%= e.title %> #display both erb
...
<% end %>
...
<% end %>
Althogh I come up with idea which I create two partials, it contradicts the DRY policy.
It would be appreciated if you could give me any idea.
You can use controller.action_name.
<% if controller.action_name == 'show' %>
<%= l(e.start_at) %>-<%= l(e.end_at) %> # display only show.html.erb
<% end %>
The params hash also contains the action_name.
action_name is enough and do the trick but personally I don't like this. I'd do two separate partials.
Can check current action and current controller on page. So we can call single partial from different actions and can customize as per action name or action and controller name.
eg.
<% schedule.rooms.each_with_index do |a, idx| %>
<% a.events.each do |e| %>
<% if #current_controller == "events" and #current_action == "show" %>
<%= l(e.start_at) %>-<%= l(e.end_at) %> # display only show.html.erb
<% end %>
<%= e.title %> #display both erb
...
<% end %>
...
<% end %>
Also need to update Application Controller.
class ApplicationController < ActionController::Base
before_filter :instantiate_controller_and_action_names
def instantiate_controller_and_action_names
#current_controller = controller_name
#current_action = action_name
end
end
You could use CSS to hide/show the content based on context.
In practice, I have found this a good way to reuse partials that have small differences. Especially when those differences don't cost anything to compute i.e. printing a date
You can cache the partials without worrying about where they are rendered
Reduce conditional logic
Remove duplication
<% if controller.action_name == 'show' %> is fine for a simple use case. If/When you come to have multiple places where the partial needs to be rendered, it will become unwieldy. The CSS solution would only require another wrapper <div class="schedules--whatever"> and the related CSS style.
show.html.erb
<div class="schedules--show">
<%= render #schedules %>
</div>
index.html.erb
<div class="schedules--index">
<%= render #schedules %>
</div>
_schedule.html.erb
<% schedule.rooms.each_with_index do |a, idx| %>
<% a.events.each do |e| %>
<div class="event__date">
<%= l(e.start_at) %>-<%= l(e.end_at) %>
</div>
<%= e.title %>
...
<% end %>
...
<% end %>
schedules.css
.schedules--show .event__date {
display: block;
}
.schedules--index .event__date {
display: none;
}
Related
I'm new in ruby on rails, and I want to practice it.
I'm stuck when I want to include a view into antoher view.
I want by doing that to have my posts into another view than of posts/index
posts/index
method:
def index
#Posts = Post.all
end
view:
<% #posts = capture do %>
<% #posts.each do |post| %>
<h3>
<%= post.title %>
</h3>
<p>
<%= post.content %>
</p>
<% end %>
<% end %>
pages/index
<h1> Index Of another pages </h1>
<%= #posts %>
If you want to force your index action to render another view, then go with follow code:
def index
#Posts = Post.all
render 'pages/index'
end
Correct me if I haven't get you
It sounds to me like you need to save the reusable view code as a partial, and render it all places it's required.
To use a partial, save it down with an underscore prefix, i.e. _posts.html.erb.
This can then be rendered using:
<%= render 'path/to/posts' %>
You'll likely need to pass in the posts variable to the partial, as in the following:
<%= render 'path/to/posts', posts: #posts %>
And the change your view to use posts rather than #posts.
Update:
The result of capture is assigned to #posts, although this variable still wouldn't be available in another template - rather to be used again on the same page
Based on what you're saying about the project's structure, it sounds like you'd need the following:
in app/views/posts/_posts.html.web
<% #posts.each do |post| %>
<h3>
<%= post.title %>
</h3>
<p>
<%= post.content %>
</p>
<% end %>
In both controllers' index action:
#posts = Post.all
In the posts/index view:
<%= render 'posts' %>
In the pages/index view:
<%= render 'posts/posts' %>
I don't want to confuse things, but Rails has a little magic in there where -
alternatively - you can define a partial _post.html.erb as follows:
<h3>
<%= post.title %>
</h3>
<p>
<%= post.content %>
</p>
And simply call <%= render #posts %> in each view. This would be the best 'Railsy' way of doing things.
Let me know how you get on!
I have a very simple requirement - I have a layout comprising of a header and body. It is a sub-layout of the page, not for the page itself.
This layout is repeated throughout multiple pages, and it is possible the structure around it will change. So I want to be able to separate the content of the header and the content of the body from the structure that contains it.
My first attempt was to use render a partial as a layout that used named yields to render a header and body:
<header class="Resource-header">
<%= yield :resource_header %>
</header>
<div class="Resource-body">
<%= yield :resource_body %>
</div>
Then render it from my templates like this:
<%= render layout: 'admin/resource' do %>
<% content_for :resource_header do %>
<% end %>
<% content_for :resource_body do %>
<% end %>
<% end %>
However, this renders nothing.
I started playing with the order of things, and discovered that if the content_for blocks are declared before the call to the partial, this approach does work:
<% content_for :resource_header do %>
<% end %>
<% content_for :resource_body do %>
<% end %>
<%= render layout: 'admin/resource' do %><% end %>
However this just feels incredibly hacky. It seems that content_for is scoped globally, and there is no association between the content_for block and the partial rendering.
So what is the correct way for me to achieve this?
I just happened to have exactly same problem.
Solution is:
in your partial layout file 'admin/resource' body:
<header class="Resource-header">
<%= yield resource, :resource_header %>
</header>
<div class="Resource-body">
<%= yield resource, :resource_body %>
</div>
in your templates do:
<%= render layout: 'admin/resource' do |resource, section| %>
<% case section %>
<% when :resource_header %>
Resource header shows here.
<% when :resource_body %>
Resource body shows here.
<% end %>
<% end %>
Take a look on rails presenters https://www.ruby-toolbox.com/categories/rails_presenters
Maybe your solution is cells gem.
Eventhough the question is quite old now, I had a similar issue today. I came up with sth. like this. No gem or custom class required, just some fancy block usage ;)
<!-- app/views/layouts/fancy-blocks.html.erb -->
<%
body, footer = nil
yield(
proc {|&blk| body = capture(&blk) },
proc {|&blk| footer = capture(&blk) }
)
%>
<section class="body"><%= body %></section>
<footer><%= footer %></footer>
<!-- app/views/some-other/view.html.erb -->
<%= render 'layout/fancy-blocks' do |body, footer| %>
<% body.call do %>
BODY
<% end %>
<% footer.call do %>
FOOTER
<% end %>
<% end %>
When you just need to return one line of html, decorators are great!
However, I don't know how I should conditionally render a complex, multilined section of HTML, such as this:
<% if current_user == #user || current_user.is_admin? %>
<h3> Private Info: </h3> <h4> - Only <%= #user.is_owner? %> can view this information </h4>
<p><strong>First Name:</strong> <%= #user.decorate_first_name %> </p>
<p><strong>Last Name:</strong> <%= #user.decorate_last_name %></p>
<p><strong>Email:</strong> <%= #user.decorate_email %> </p>
<% end %>
As you can see, I'm wrapping it in an if statement, which is exactly what I want to replicate with a decorator, but I'm not sure how.
Should I create a partial and render the partial with a decorator?
app/decorators/user_decorator.rb:
def decorate_private_info
h.render 'private_info' if current_user? || admin?
end
I have a main page that is responsible for HTML/CSS styling, but some of the contents come from partials. A partial receives some locals or params, i.e. current_user or person, and displays information if any.
Is there a way for me to check if a partial rendered anything? My end goal is something like this:
<% if my_partial can render something %>
<div class="css_for_something">
<%= render(partial: 'my_partial', locals: {...} ) %>
<% else %>
<div class="css_for_no_info">
<%= render something else %>
<% end %>
I do not want the partials to handle styling logic; they just need to display content if any. Conversely, the main page should not know anything about the logic in the partial(s), such as checking values or querying the database.
Thank you
Unfortunately, Chris Peter's solution did not work for me on rails 4.2.4, as render_to_string seems to not be available in views.
However, the following worked (rails 4.2.4):
<% partial_content = render partial: 'my_partial' %>
<% if partial_content.present? %>
<%= partial_content %>
<% else %>
<%# rendered if partial is empty %>
<% end %>
Be aware that the present? check really only checks if what was rendered is empty. If, something, e.g. a HTML comment, is returned, the check returns false.
Try storing the value generated by render_to_string in a variable:
<% partial_content = render_to_string(partial: 'my_partial', locals: {...} ).strip %>
Then you can see if it contains any content:
<% if partial_content.present? %>
<%= partial_content %>
<% else %>
<div class="css_for_no_info">
<%= render something else %>
</div>
<% end %>
Hy,
I have a layout in the views/layout that has 2 cols and then in every view i have content_for :main_col and content_for :side_col. The problem is that i have more than 5 views with the same content in the content_for :side_col
You have a better idea on how to do this?thanks
Put it into a partial and render the partial where you need it.
app/views/shared/_sidebar.html.erb
<% content_for :sidebar do %>
Hello, I am your neighbourhood friendly sidebar!
<% end %>
app/views/somewhere/else.html.erb
<%= render :partial => "shared/sidebar" %>
If you need pass variables to your partials (what I guess you do), use a helper it's a very neat way to DRY your code:
# app/views/shared/_side_col.html.erb
<% content_for :side_col do %>
<ul>
<% menu_items.each do |item| %>
<li><%= item %></li>
<% end %>
</ul>
<% end %>
# app/helpers/application_helper.rb
def side_col(menu_items)
render 'shared/_side_col', :menu_items => menu_items
end
# app/views/your/view.html.erb
<%= side_col your_menu_items_for_this_view %>