An enumeration of objects, has nested objects. The goal is to render a partial for futher nested objects
<% groups.each do |group| %>
<% group.children.each do |child| %>
<% if child.lessons.size > 0 %>
<% render 'child_partial' %>
<% end %>
<% end %>
<% end %>
When the partial is defined as as per the Rails guides
<% render 'child_partial', locals: {child: child} %>
or
<% render 'child_partial', object: child %>
error undefined local variable or method 'child' for #<ActionView::Base is returned when the partial calls (for testing purposes) <%= child.class %>
How can I pass the object to the partial so that it may be processed properly?
You just need to follow the guides literally:
<%= render partial: 'child_partial', locals: {child: child} %> # or
<%= render 'child_partial', child: child %>
And it's better to render with collections for performance:
<% groups.each do |group| %>
<%= render partial: 'child_partial',
collections: group.children.select { |child| child.lessons.size > 0 },
as: :child %>
<% end %>
render will not accept additional local variables for the partial, you need to use render partial: as following for that:
<% render partial: 'child_partial', locals: {child: child} %>
Related
Rails has this pretty way to render a collection using partial
<%= render partial: 'erb_partials/post', collection: #users, as: :user %>
How can I apply this in my loop of forms?
<%= profile_form.fields_for :item_groups, #item_groups do |item_form| %>
<%=render partial: 'item_groups/item_group', locals: {item_form: item_form}%>
<% end %>
<%=profile_form.submit%>
In your case you can't use the render partial: 'path', collection: #list method.
If you unfold your first example:
<%= render partial: 'erb_partials/post', collection: #users, as: :user %>
You get:
<% #users.each do |user| %>
<%= render 'erb_partials/post', user: user %>
<% end %>
The above is such a common action that the render method included the :partial option to wrap the render call in an each loop. render doesn't include any other iteration wrapper options at this moment.
def react
#postsAlPHA = #user.find(params[:liked_post]).page(params[:page])
#postsBETA = #user.find(params[:disliked_post]).page(params[:page])
end
so I am trying to make #postsAlPHA to render alpha.js.erb for pagination
and #postsBETA to render
BETA.js.erb
<% #postsAlPHA.each do |x| %>
<% x.body %>
<% end %>
<%= paginate #postsAlPHA %>
<% #postsBETA.each do |u| %>
<% x.content %>
<% end %>
<%= paginate #postsBETA %>
Turn them into partials, then render them in your view. Make sure to prefix the filenames with _ e.g. _alpha.js.erb.
In your view:
<%= render partial: 'path/to/alpha.js.erb' %>
<%= render partial: 'path/to/beta.js.erb' %>
I have a controller with 3 objects and i want to call the same partial three time with each object
class HomeController < ApplicationController
def index
#evaluations_teams = Evaluation.eager_load(:user).where(users: {status: true}).where(team_id: current_user.student_details.last.team_id).all.order(created_at: :desc).limit 5
#evaluations_stage = Evaluation.eager_load(:user).where(users: {status: true}).where(stage_id: current_user.student_details.last.stage_id).all.order(created_at: :desc).limit 5
#evaluations_schools = Evaluation.eager_load(:user).where(users: {status: true}).where(school_id: current_user.student_details.last.school_id).all.order(created_at: :desc).limit 5
end
end
INDEX.HTML.ERB
<%= render 'home/partials/loop_areas', locals: {evaluations:#evaluations_teams} %>
<%= render 'home/partials/loop_areas', locals: {evaluations:#evaluations_stage} %>
<%= render 'home/partials/loop_areas', locals: {evaluations:#evaluations_schools} %>
Partial: home/partials/_loop_areas.html.erb
<% #evaluations.each do |evaluation| %>
<div class="div-card-infosaluno">
<div class="card-aluno"><%= evaluation.user.full_name %></div>
<div class="card-serie"><%= "#{evaluation.stage.name} · #{evaluation.school.name}" %></div>
</div>
<% end %>
This returns:
undefined method `each' for nil:NilClass
on <% #evaluations.each do |evaluation| %>
How can i do this?
You're trying to access an instance variable #evaluations in your partial but it is not defined in the controller action.
You've to instead loop through the local variable evaluations.
<%# home/partials/_loop_areas.html.erb %>
<% evaluations.each do |evaluation| %>
...
<% end %>
And your view should be
<%= render 'home/partials/loop_areas', evaluations: #evaluations_teams %>
<%= render 'home/partials/loop_areas', evaluations: #evaluations_stage %>
<%= render 'home/partials/loop_areas', evaluations: #evaluations_schools %>
You can also pass a hash to the render method but I feel it is more verbose.
<%= render partial: 'home/partials/loop_areas', locals: { evaluations: #evaluations_schools } %>
Please try the below code in Partial: home/partials/_loop_areas.html.erb
It should work as you are expecting.
<% evaluations = local_assigns[:evaluations] %>
<% evaluations.each do |evaluation| %>
<div class="div-card-infosaluno">
<div class="card-aluno"><%= evaluation.user.full_name %></div>
<div class="card-serie"><%= "#{evaluation.stage.name} · #{evaluation.school.name}" %></div>
</div>
<% end %>
Thanks.
For the normal situation. Different views can use the same partial like this
<h1>New zone</h1>
<%= render partial: "form", locals: {zones: #zones} %>
<h1>Editing zone</h1>
<%= render partial: "form", locals: {zones: #zones} %>
<% zones.each do |zone| %>
<%= zone.location%>
<% end %>
But my situation is a bit different, the origin code like this
one belongs_to two #one = One.all
one.html.erb
<%= render partial: "one",locals:{one: #one} %>
_one.html.erb
<% one.each do |n|%>
<%= n.location%>
<% end %>
two has_many one #two = Two.all
two.html.erb
<%= render partial: "two", #two %>
_two.html.erb
<% #two.each do |one|%>
<% one.each do |n|%>
<%= n.location %>
<% end %>
<% end %>
For this situation, how can I code render for two.html.erb if I want one.html.erb and two.html.erb use the same partial _one.html.erb ?
this one is definitely incorrect, but how to correct this?
two.html.erb
<%= render partial: "one/one", locals: {one: #two} %>
========================update============================
I think the basic of question is whether we can use the same partial for an object and at the same time for a collection.
I need to iterate through an array starting at a specific point in the array to the very end of it.
For example:
<% #posts[6.."To the very end of array"].each do |post| %>
<%= render partial: 'posts/post', locals: {post: post} %>
<% end %>
Here is a more complete example of what I'm trying to accomplish.
<% #posts.each do |post| %>
<% if post == #posts.first && !params[:page] %>
<div class="hidden-phone hidden-tablet">
<%= render partial: 'posts/main_post', locals: {post: post} %>
</div>
<div class="visible-phone visible-tablet">
<%= render partial: 'posts/post', locals: {post: post} %>
</div>
<%= render partial: 'posts/add_post' %>
<% end %>
<% end %>
<% #posts[1..5].each do |post| %>
<%= render partial: 'posts/post', locals: {post: post} %>
<% end %>
<%= render partial: 'posts/add2_post' %>
<% #posts[6..11].each do |post| %>
<%= render partial: 'posts/post', locals: {post: post} %>
<% end %>
<%= render partial: 'posts/add3_post' %>
<% #posts[12.."To the very end of array"]each do |post| %>
<%= render partial: 'posts/post', locals: {post: post} %>
<% end %>
Is there a more efficient way to accomplish this?
Thanks for your help.
You can use the length of the array, like so:
<% #posts[6..#posts.length].each do |post| %>
<%= render partial: 'posts/post', locals: {post: post} %>
<% end %>
Technically you should be doing length-1 but that can be tedious to type, and if you supply a number larger than the bounds of the array, Ruby will just not go past it anyways.