student_classes_controller.rb
class StudentClassesController < ApplicationController
before_filter :set_batch
def index
#sections = StudentClass.all
end
def show
#section = StudentClass.find(params[:id])
end
private
def set_batch
#batch = Batch.find(params[:batch_id])
end
end
in the view of student_classes/index.html.erb
<table class="table table-bordered table-hover">
<thead bgcolor="#B7B7B7">
<th>Section</th>
<th>Number of Students</th>
<th>Details</th>
</thead>
<% #sections.each do |section| %>
<tr>
<td><%= section.name %></td>
<td><%= section.students.count %></td>
<td><%= link_to 'View Details', batch_student_classes_path(#batch , section) %></td>
</tr>
<% end %>
</table>
the url of view details is this http://localhost:3000/batches/1/student_classes.1
but i want to make it as this http://localhost:3000/batches/1/student_classes/1
routes.rb
resources :batches do
resources :student_classes
end
rake routes
batch_student_classes GET /batches/:batch_id/student_classes(.:format) student_classes#index
POST /batches/:batch_id/student_classes(.:format) student_classes#create
new_batch_student_class GET /batches/:batch_id/student_classes/new(.:format) student_classes#new
edit_batch_student_class GET /batches/:batch_id/student_classes/:id/edit(.:format) student_classes#edit
batch_student_class GET /batches/:batch_id/student_classes/:id(.:format) student_classes#show
PUT /batches/:batch_id/student_classes/:id(.:format) student_classes#update
DELETE /batches/:batch_id/student_classes/:id(.:format) student_classes#destroy
The path method you want to call is batch_student_class_path not batch_student_class*es*_path.
Related
I'm putting together a combo box or called the same as a select in rails, I put everything together but it gives me an error that tells me that I have a problem with the map inside the select, I'm using simple_form_for and I'm doing a map inside the collection inside the selector or called in simple_for associatio.
I copy the view and the controller
This view
<h1>HistContact#index</h1>
<p>Find me in app/views/hist_contact/index.html.erb</p>
<%= simple_form_for #histcontact, url:hist_contact_index_path do |f| %>
<% f.association :contact, collection: #contacts.map{|cont| [cont.name , cont.id]}%>
<%f.submit "buscar"%>
<% end %>
<table id = "client_table" class="table table-striped table-sm">
<thead>
<tr>
<th>Id</th>
<th>fecha</th
</tr>
</thead>
<tbody>
<% #histcontacts.each do |c|%>
<tr>
<td> <%= c.id %> </td>
<td> <%= c.created_at %></td>
</tr>
<% end %>
</tbody>
</table>
the controller
class HistContactController < ApplicationController
before_action :authenticate_user!
def index
#histcontacts = HistContact.all
#contacts = Contact.all
end
def new
#histcontact = HistContact.new
#contacts = Contact.new
end
def create
#histcontact = HistContact.find(contact_id: params[:contact])
end
private
def contactID(current_user)
client_id = Client.where(user_id: current_user.id)
contact_id = Contact.where(client_id: client_id.ids[0])
return contact_id
end
end
Thank you
According to error, you are trying to map a single object instead of an array of objects. Based on your controller code, the view file you shared is probably new.html.erb. To solve this problem you need do it like this:
def new
#histcontact = HistContact.new
#contacts = Contact.all
end
Im currently working in an Rails 5 application where you can search for a first name or last name and records of the customers of that account would be displayed. However I am getting a Nil object return from search algorithm.
customers_controller:
class CustomersController < ApplicationController
def index
if params[:keywords].present?
#keywords = params[:keywords]
customer_search_term = CustomerSearchTerm.new(#keywords)
#customer = Customer.where(
customer_search_term.where_clause,
customer_search_term.where_args).
order(customer_search_term.order)
else
#customers = []
end
end
end
As you can see if there is no records found is suppose to return an empty array but is returning a Nil object.
customers/index.html.erb
[![<header>
<h1 class="h2">Customer Search</h1>
</header>
<section class="search-form">
<%= form_for :customers, method: :get do |f| %>
<div class="input-group input-group-lg">
<%= label_tag :keywords, nil, class: "sr-only" %>
<%= text_field_tag :keywords, nil,
placeholder: "First Name, Last Name or Email Address",
class: "form-control input-lg" %>
<span class="input-group-btn">
<%= submit_tag "Find Customers", class: "btn btn-primary btn-lg" %>
</span>
</div>
<% end %>
</section>
<section class="search-results">
<header>
<h1 class="h3">Results</h1>
</header>
<table class="table table-striped">
<thead>
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
<th>Joined</th>
</tr>
</thead>
<tbody>
<% #customers.each do |customer| %>
<tr>
<td><%= customer.first_name %></td>
<td><%= customer.last_name %></td>
<td><%= customer.email %></td>
<td><%= l customer.created_at.to_date %></td>
</tr>
<% end %>
</tbody>
</table>
</section>][1]][1]
The first thing you should understand is that instance variables return nil if they haven't been set. If you say #fake_var == nil it will be true if you never defined #fake_var before this. You can contrast this with regular local variables, which will raise a NoMethodError if you try and use them before they're defined. For example, puts(fake_var) will raise a NoMethodError for fake_var.
Now look at your template. No matter what it will loop over #customers. If #customers has not been set, you'll see a NoMethodError because you can't call each on nil.
Finally, look at your controller action:
def index
if params[:keywords].present?
#keywords = params[:keywords]
customer_search_term = CustomerSearchTerm.new(#keywords)
#customer = Customer.where(
customer_search_term.where_clause,
customer_search_term.where_args).
order(customer_search_term.order)
else
#customers = []
end
end
Specifically the case when params[:keywords].present?. You never set #customers in this case so it will be nil when the template tries to access it.
I think if you simply replaced #customer = with #customers = it would solve your problem.
you can force it to return array using #to_a which converts nil to empty array
def index
return [] unless params[:keywords]
#keywords = params[:keywords]
customer_search_term = CustomerSearchTerm.new(#keywords)
#customer = Customer.where(
customer_search_term.where_clause,
customer_search_term.where_args).
order(customer_search_term.order
).to_a
end
https://apidock.com/ruby/Array/to_a
I'm pretty new to Ruby on Rails and Ruby in general but I'm trying to make a small website with simple database in Ruby on Rails.
At the moment I have the html.erb pages to show, add and edit records.
The next thing i wanted to do is the action that redirects user to a page with more info about the record he clicked in the record table.
I can't really think of any way to do this.
Any help would be really appriciated.
p.s. Sorry for any mistakes in my English - it's not my first language and im still learning!
Here is my html code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="tablecontainer">
<table class="table table-bordered table-condensed">
<tr class="success">
<td><b>Nazwa</b></td>
<td><b>Obrażenia</b></td>
<td><b>Typ</b></td>
<td><b>Waga</b></td>
<td><b>Zasięg</b></td>
<td><b>Szybkość</b></td>
<td><b>Rzadkość</b></td>
<td><b>Opcje</b></td>
</tr>
<% #biala.each do |b| %>
<tr>
<td><%= b.nazwa %></td>
<td><%= b.obrazenia %>%</td>
<td><%= b.typ %></td>
<td><%= b.waga %></td>
<td><%= b.zasieg %></td>
<td><%= b.szybkosc %></td>
<td><%= b.rzadkosc %></td>
<td><%= link_to '', {id: b.id, action: 'db_wiecejbiala'}, class: "glyphicon glyphicon-info-sign" %><%= link_to '', {id: b.id, action: 'db_edytujbiala'}, class: "glyphicon glyphicon-pencil" %> <%= link_to '', {id: b.id, action: 'usunbiala'}, data: {confirm: 'Jesteś tego pewien?'}, class: "glyphicon glyphicon-remove" %></td>
</tr>
<% end %>
</table>
And here is the controller:
class BazaController < ApplicationController
def db_bronbiala
#biala = BronBiala.all
#iloscbiala = BronBiala.count
end
def db_dodajbiala
#nowybiala = BronBiala.new
end
def utworzbiala
#nowybiala = BronBiala.new(parametrybiala)
if #nowybiala.save
redirect_to(action: 'db_bronbiala')
else
render('db_dodajbiala')
end
end
def parametrybiala
params.require(:bron_biala).permit(:nazwa, :obrazenia, :typ, :waga, :zasieg, :szybkosc, :rzadkosc, :zalety, :wady, :ciekawostki, :opis)
end
def usunbiala
usuwaniebiala = BronBiala.find(params[:id]).destroy
#biala = BronBiala.all
render('db_bronbiala')
end
def db_edytujbiala
#biala = BronBiala.all
#edytowanabiala = BronBiala.find(params[:id])
end
def aktualizujbiala
#biala = BronBiala.all
#edytowanabiala = BronBiala.find(params[:id])
if #edytowanabiala.update_attributes(parametrybiala)
redirect_to(action: 'db_bronbiala')
else
render('db_edytujbiala')
end
end
def db_wiecejbiala
#biala = BronBiala.all
#bialawiecej = BronBiala.find(params[:id])
end
end
And the db_bialawiecej code:
<div class="content">
<h2>Lista:</h2>
<div class="tablecontainer">
<table class="table table-bordered table-condensed">
<tr class="success">
<td><b>Nazwa</b></td>
<td><b>Obrażenia</b></td>
<td><b>Typ</b></td>
<td><b>Waga</b></td>
<td><b>Zasięg</b></td>
<td><b>Szybkość</b></td>
<td><b>Rzadkość</b></td>
</tr>
<% #bialawiecej.id do |b| %>
<tr>
<td><%= b.nazwa %></td>
<td><%= b.obrazenia %>%</td>
<td><%= b.typ %></td>
<td><%= b.waga %></td>
<td><%= b.zasieg %></td>
<td><%= b.szybkosc %></td>
<td><%= b.rzadkosc %></td>
</tr>
<% end %>
</div>
</div>
On click send id of clicked item (GET). you will have link similar to : localhost:3000/desired_model/5
then in action do #desired_model = DesiredModel.find(params[:id])
redirect user to desired show page.
Show data.
Next time please provide some code :)
I have a index method in my rails 4 application controller that looks like:
def index
#products = Product.all
#headers = #products.map(&:data).flat_map(&:keys).uniq
#product_data = #products.map{ |product| product[ :data ].values }
end
So #product_data ends up with something like:
[["Table", "$199.99", "blue"], ["Book", "$9.99", "green"]]
In my view, I put all of this in a unordered list. But now I'd like to have a link_to an edit and delete page for each product. How can I include this in my array, so I can display a link for each product on the view page?
You could add product_id to the result of product[:data].values array. Then use that product_id as parameter to your product url_helpers.
#product_data = products.map{ |product| product[ :data ].values.unshift(product.id) }
This should give you something similar to:
[[1, "Table", "$199.99", "blue"], [2, "Book", "$9.99", "green"]]
I see there is no use of #product_data there.Why can't You display the data in a table in your index.html.erb and you can loop through every product,so that the edit and delete links appear to every product.Assuming that you have name,price and color attributes for your product model,just do like this
In your index.html.erb:
<table border=1>
<tr>
<th>Product Name</th>
<th>Product Price</th>
<th>Product Color</th>
<th></th>
<th></th>
</tr>
<% #products.each do |p| %>
<tr>
<td><%=p.name %></td>
<td><%=p.price %></td>
<td><%=p.color %></td>
<td><%=link_to 'Edit', :action => "edit", :id => p.id %></td>
<td><%=link_to 'Delete', :action => "delete", :id => p.id, :confirm => "Are you sure?" %></td>
</tr>
<% end %>
</table>
Note:
Its just an another approach.
I am using gmaps4rails. I am trying to achieve the following: The map is showing locations with markers and the user can zoom/move his window of sight as he wishes. What I want is that as he does so, a list next to the map should dynamically update with all the locations that are currently visible.
I tried using the callback mechanism and getBounds to filter a data structure of what is visible, but without success.
How can I go about it?
Thanks a lot!
Julian
In my controller: class LocationsController < ApplicationController
def index
if (params[:sw_y] && params[:sw_x] && params[:ne_y] && params[:ne_x])
bounds = [ [params[:sw_x].to_f, params[:sw_y].to_f],
[params[:ne_x].to_f, params[:ne_y].to_f] ]
#locations_within_bounds = Location.within_bounds(bounds)
else
#locations_within_bounds = Location.all
end
#locations = Location.all
#json = Location.all.to_gmaps4rails
And in my view:
<%= gmaps("markers" => {"data" => #json, "options" => {"list_container" => "markers_list", "do_clustering" => true } } ) %>
<table>
<tr>
<th>Name</th>
<th>Address</th>
<th>Longitude</th>
<th>Latitude</th>
<th></th>
<th></th>
<th></th>
</tr>
<% #locations_within_bounds.each do |location| %>
<tr>
<td><%= location.name %></td>
<td><%= location.address %></td>
<td><%= location.longitude %></td>
<td><%= location.latitude %></td>
</tr>
<% end %>
</table>