I have a loop using associations. I'm looking to group by treatment and display in a row.
Each loop has three records for each treatment. The code below this is what i'm producing.
VIEW
<table>
<tr>
<td>Treatment</td>
<td>Date</td>
<td>Count</td>
</tr>
<% #trial.establishmentMethods.order(:treatment_selection_id).each do |data| %>
<tr>
<td><%= data.treatmentSelection.treatment.name %></td> This is reference by treatment_selection_id.
<td><%= data.date %></td>
<td><%= data.count %></td>
</tr>
<% end %>
</table>
This is what i'm hoping to produce. Display the treatment once, then loop the related treatment_selection_id's on the same row.
Here are my models and associations.
class Trial < ApplicationRecord
has_many :assessments, primary_key: 'trial_id'
has_many :establishmentMethods, through: :assessments
end
class EstablishmentMethod < ApplicationRecord
belongs_to :treatmentSelection, primary_key: 'treatment_selection_id', foreign_key: 'treatment_selection_id'
has_many :treatments, through: :treatmentSelection
end
class TreatmentSelection < ApplicationRecord
belongs_to :treatment, primary_key: 'treatment_id'
end
It seems like TreatmentSelection has_many establishmentMethods, so you should add that to the TreatmentSelection model. Then you can do something like:
<% treatment_selections.each do |treatment_selection| %>
<tr>
<td><%= treatment_selection.treatment.name %></td>
<% treatment_selection.establishmentMethods.each do |em| %>
<td><%= em.date %></td>
<td><%= em.count %></td>
<% end %>
</tr>
<% end %>
By the way, it's convention to use snake_case in ruby and it will make using associations easier.
Related
I am new to Ruby and RubyOnRails. I have been following a basic Rails tutorial thus far and have created several views and controllers to be able to perform basic CRUD on my MySQL DB, each one is specific to tables in the DB.
I started a new view, and I want to be able to display info from two separate tables. I want to be able to grab the Customers Name for their contract. I feel like this is an easy and common fix, What the heck am I overlooking?
Contract View
<table>
<tr>
<th>Contract ID</th>
<th>Customer ID</th>
<th>Discount</th>
<th>Start Date</th>
<th>End Date</th>
<th>Payment Terms</th>
<th>Delivery Day Of Week</th>
<th>Employee ID</th>
<th>Note</th>
<th>Commission</th>
<th>Active</th>
</tr>
<% #contracts.each do |contract| %>
<tr>
<td><%= contract.ContractID %></td>
<td><%= contract.CustomerID %></td>
<td><%= contract.fields_for :customer do |w| %>
<%= w.text_field :CustomerName %>
<% end %>
</td>
<td><%= contract.Discount %></td>
<td><%= contract.StartDate %></td>
<td><%= contract.EndDate %></td>
<td><%= contract.PaymentTerms %></td>
<td><%= contract.DeliveryDayOfWeek %></td>
<td><%= contract.EmployeeID %></td>
<td><%= contract.Note %></td>
<td><%= contract.Commission %></td>
<td><%= contract.Active %></td>
</tr>
<% end %>
</table>
Contract Model
> class Contract < ApplicationRecord belongs_to :customer
>
> accepts_nested_attributes_for :customer
> #Validation
>
>
> #Mapping this object to the Database tables self.table_name = "contract" self.primary_key = "ContractID" end
Customer Model
> class Customer < ApplicationRecord
>
> has_many :contracts
>
> #Validation validates :CustomerID, :CustomerTypeID, presence: true
>
> validates :CustomerID, uniqueness: true
>
> #Mapping this object to the Database tables self.table_name = "customer" self.primary_key = "CustomerID"
>
> end
Contracts Controller
class ContractsController < ApplicationController
def index
#contracts = Contract.all
#customers = Customer.all
end
end
Since you've already defined that a Customer may have many contracts then you need now to define that that Contract belongs to a customer, so, modifying your models they should look like:
class Contract < ApplicationRecord
belongs_to :customer
...
end
class Customer < ApplicationRecord
has_many :contracts
...
end
Now you're able to access the customer name attribute from a certain contract, like:
<% #contracts.each do |contract| %>
<%= contract.customer.name %>
<% end %>
This should work on getting the customer name, but for improving that query, you might add an includes on the index action:
def index
#contracts = Contract.includes(:customer).all
...
end
I want to set up sort order for active record collection proxy in table.
It should be sorted by number of available rooms (from highest to lowest).
The trick is that #rooms.reserved is a boolean and to calculate quantity of free/reserved rooms I have to use helper method to avoid record collection proxy errors. I get proper results, but I need to sort table by number of available rooms.
I have two models: Room and Hotel.
class Room < ApplicationRecord
belongs_to :hotel, optional: true # avoiding rails 5.2 belongs_to error
accepts_nested_attributes_for :hotel
end
and
class Hotel < ApplicationRecord
has_many :rooms, dependent: :destroy
accepts_nested_attributes_for :rooms
end
I have table:
<table>
<tr>
<th>Name</th>
<th>Rooms count</th>
<th>Rooms status: in reserve || free</th>
</tr>
<% #hotels.each do |hotel| %>
<tr>
<td><%= hotel.name %></td>
<td><%= hotel.rooms_count %></td>
<td><%= rooms_reservation_status(hotel.rooms) %></td> <!-- rooms_reservation_status helper method in application_helper.rb -->
<td ><%= link_to 'Show', hotel_path(hotel) %></td>
<td><%= link_to 'Destroy', hotel, method: :delete, data: { confirm: 'Are you sure?' } %>
</tr>
<% end %>
</table>
Helper method
# rooms_reservation_status iterates throught ActiveRecord::Associations::CollectionProxy
# and calculates the sum of free rooms aswell as a sum of reserved rooms
def rooms_reservation_status(rooms)
reserved = 0
free = 0
rooms.each do |r|
r.reserved == true ? reserved+=1 : free+=1
end
"#{reserved} || #{free}"
end
Active Record table for rooms:
class CreateRooms < ActiveRecord::Migration[5.1]
def change
create_table :rooms do |t|
t.boolean :reserved, :default => false
t.belongs_to :hotel, index: true
t.timestamps
end
end
end
I would add a class method on the Room model in order to return for a given collection the number of free rooms and reserved rooms:
class Room < ApplicationRecord
belongs_to :hotel, optional: true
accepts_nested_attributes_for :hotel
def self.reserved_count
where(reserved: true).count
end
def self.free_count
where(reserved: false).count
end
end
Once you have implemented, you can call it from the relationship declared in Hotel model:
class Hotel < ApplicationRecord
has_many :rooms, dependent: :destroy
accepts_nested_attributes_for :rooms
def reserved_rooms
rooms.reserved_count
end
def free_rooms
rooms.free_count
end
end
Your view will look finally like this:
<table>
<tr>
<th>Name</th>
<th>Rooms count</th>
<th>Rooms status: in reserved || free</th>
</tr>
<% #hotels.each do |hotel| %>
<tr>
<td><%= hotel.name %></td>
<td><%= hotel.rooms_count %></td>
<td><%= "#{hotel.reserved_rooms} || #{hotel.free_rooms}" %></td>
<td ><%= link_to 'Show', hotel_path(hotel) %></td>
<td><%= link_to 'Destroy', hotel, method: :delete, data: { confirm: 'Are you sure?' } %>
</tr>
<% end %>
</table>
Sorting the Hotels in your controller
In your controller make sure that you eager load Rooms for Hotel:
#hotels = Hotel.includes(:rooms).sort_by { |h| h.free_rooms.to_i }.reverse
You could eventually implement it as Hotel.includes(:rooms).sort_by(&:free_rooms).reverse.
In this way you won't need any join or helper.
Regarding your comment, free_rooms is implemented as an instance method (e.g. Hotel.first.free_rooms), so it will not be available for an ActiveRecord_Relation (e.g. Hotel.all.free_rooms)
I am trying to link to the existing route /clients/:client_id/invoices/:id
from my /clients/:client_id show page and cant work out how to do so.
I have a has_many through: relationship and here are my models
class Client < ActiveRecord::Base
has_many :invoices
has_many :items, through: :invoices
class Invoice < ActiveRecord::Base
belongs_to :user
belongs_to :client
has_many :items, :dependent => :destroy
accepts_nested_attributes_for :items, :reject_if => :all_blank, :allow_destroy => true
class Item < ActiveRecord::Base
belongs_to :invoice
belongs_to :client
My routes
resources :clients do
resources :invoices
end
resources :invoices
my client controllers show action
def show
#client = Client.find(params[:id])
#invoices = #client.invoices.build
end
And my clients show.html.erb
<div class="panel-body">
<table class="table table-hover">
<thead>
<tr>
<th>Sender</th>
<th>Reciever</th>
<th>Amount</th>
<th>Currency</th>
<th>Date</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% #client.invoices.each do |invoice| %>
<tr>
<td><%= invoice.sender %></td>
<td><%= invoice.reciever %></td>
<td><%= invoice.amount %></td>
<td><%= invoice.currency %></td>
<td><%= invoice.date %></td>
<td><%= link_to 'Show', invoices_path(#clients, #invoice) %></td>
</tr>
<% end %>
</tbody>
</table>
</div>
everytime I click the link_to show it routes me to /invoices
I have tried a bunch of different link_to formats but I haven't been able to figure it out.
You are using wrong url_helper with wrong parameters. You should have:
<td><%= link_to 'Show', client_invoice_path(#client, invoice) %></td>
or
<td><%= link_to 'Show', invoice_path(invoice) %></td>
invoices_path is an url_helper generated by resources :invoices (the most outside one) and will route you to the index path for your InvoicesController (/invoices). If you pass an argument, it will be used for the format (/invoices.10 - quite common issue).
All the routes generated by nested resources have a name consisting of both resources, like new_user_profile_path or client_invoice_type_path (triple nested).
Note that your current route structure (same resources with two different paths) might make your controller logic more complex. It is usually sufficient to have a single route, pick one.
Frnds I am new to rails, here i created two tables caleed stocks and stock_availabilities.
in the stock model
class Stock < ActiveRecord::Base
belongs_to :projects_lkp
has_many :stock_availabilities
validates_presence_of :item
end
In the stock_availabilities model
class StockAvailability < ActiveRecord::Base
belongs_to :stock
validates_presence_of :qty,:add_or_issue,:price, :captured_at, :stock_id,:unit
end
Now my doubt is how to bring the field of stock_availabilties in the views of stock
<% #stock.each do |d| %>
<tr>
<td><%= d.item %></td>
"Here i need to print the values of qty and pricevwhich is in stock_availabilities class"?
</tr>
You are on the right track.
this is what you need:
<% #stock.each do |d| %>
<tr>
<td><%= d.item %></td>
<% d.stock_availabilities.each do |sAV| %>
<td> <%= sAV.qty %> </td>
... <-- You do the other ones here
<% end %>
</tr>
I have three relevant models: Vendor, Item, InventoryItem. I'm having difficulty understanding how to tap into associations to return associated attributes.
class Item < ActiveRecord::Base
has_many :inventory_items
has_many :vendors, through: :inventory_items
accepts_nested_attributes_for :inventory_items, :vendors
class InventoryItem < ActiveRecord::Base
belongs_to :item
belongs_to :vendor
class Vendor < ActiveRecord::Base
has_many :inventory_items
has_many :items, through: :inventory_items
I'm trying to return the vendors who sell an item, and the price they sell it for. Here's my SearchResults index view:
<table>
<tr class="search-table">
<td>Product</td>
<td>Details</td>
<td>Brand</td>
<td>Code</td>
<td>Vendors</td>
<td>Price</td>
</tr>
<% #items.each do |item| %>
<tr class="search-table">
<td><%= item.product %></td>
<td><%= item.details %></td>
<td><%= item.brand %></td>
<td><%= item.code %></td>
<td><%= #how to return vendors? %></td>
<td><%= #how to return price? %></td>
</tr>
<% end %>
</table>
Here is my SearchResultsController:
class SearchResultsController < ApplicationController
def index
#search = Item.solr_search do
fulltext params[:search]
end
#items = #search.results
end
end
I'm newish at RoR so any input is welcome. Thanks in advance!
EDIT
Here is what is returned from rails console when given Item.first.vendors
Item Load (0.7ms) SELECT "items".* FROM "items" LIMIT 1
Vendor Load (0.9ms) SELECT "vendors".* FROM "vendors" INNER JOIN "inventory_items" ON "vendors"."id" = "inventory_items"."vendor_id" WHERE "inventory_items"."item_id" = 1
=> []
SOLUTION EDIT
I had some fundamental errors in my model associations that wouldn't allow me to utilize those relationships. I cleaned up those associations by getting rid of duplicate fields (in this case :item_id and :product_code) and the answer below worked perfectly.
In order to list vendors of a specific item, just replace :
<td><%= #how to return vendors? %></td>
With :
<% item.vendors.each do |vendor| %>
<%= vendor.name %><br/>
<% end %>