I'm having some problems using mongoid-3.0.6 with polymorphic fields.
Using rails 3.2.8 and ruby 1.9.3
Using a normal polymorphic relation:
class Shirt
include Mongoid::Document
field :name, localize: true
belongs_to :itemizable, polymorphic: true
end
class Item
include Mongoid::Document
field :price, type: Float
field :quantity, type: Integer, :default => 1
has_one :product, as: :itemizable
accepts_nested_attributes_for :product
end
The same association is available through the metadata:
>> Item.reflect_on_association(:product)
#<Mongoid::Relations::Metadata
autobuild: false,
class_name: Product,
cyclic: nil,
dependent: nil,
inverse_of: nil,
key: _id,
macro: has_one,
name: product,
order: nil,
polymorphic: true,
relation: Mongoid::Relations::Referenced::One,
setter: product=,
versioned: false>
>> item = Item.new
#<Item _id: 50606c1668ce87692e000003, _type: nil, created_at: nil, updated_at: nil, deleted_at: nil, price: nil, quantity: 1>
but when i run
>> item.product = Shirt.new or >> item.build_product
i got always the same error
NameError: uninitialized constant Product
Full stack error
Any thoughts?
Thanks in advance.
Solved
Found the motive
Need to add the class_name to the relation
has_one :product, as: :itemizable, class_name: "Toy"
Related
This thread states that it is not a very good idea to create _id in a sub-document of MongoDB.
Mongo _id for subdocument array
I have locations and their reviews in a collection:
So, what would be the way to find a unique sub-document?
What can be set as a primary key for review sub-document?
var mongoose = require('mongoose')
var openingClosingTimeSchema = new mongoose.Schema(
{
days: {type: String, required: true},
opening: String,
closing: String,
closed: {type: String, required: true}
}
)
var reviewSchema = new mongoose.Schema(
{
author: String,
rating: {type: Number, required: true, min: 0, max: 5},
reviewText: String,
createdOn: {type: Date, default: Date.now}
}
)
var locationSchema = new mongoose.Schema(
{
// 'required' keyword is for validation.
name: {type: String, required: true},
address: String,
// 'default' keyword can be with or without quotes.
// When defining multiple properties for a field, {} are required.
rating: {type: Number, default: 0, min: 0, max: 5},
facilities: [String],
// Nest 'openingClosingTimeSchema' under 'locationSchema'.
openingTimes: [openingClosingTimeSchema],
// Nest 'reviewSchema' under 'locationSchema'.
reviews: [reviewSchema]
}
)
it is not a very good idea to create _id in a sub-document of MongoDB
This is not a universally applicable guideline.
If you need to identify subdocuments in an array, an _id field would be helpful (or any other field that would serve the same function).
If you don't need to identify subdocuments, you don't need an identification field.
Since you are in the first category it's perfectly ok to have an _id field in your use case.
I'm trying to implement this pattern
class A
Mongoid::Document
belongs_to :price
def price
self[:price] || calculate_price
end
def calculate_price
#Some logic
end
end
meaning that a user can either force a price to A or get a calculated price. Trouble is, the setter doesn't work as expected:
2.0.0-rc2 :013 > a = A.new
=> #<A _id: 5215b3321d41c89a1f000001, price_id: nil>
2.0.0-rc2 :015 > a.price = Price.new
=> #<Price _id: 5215b3451d41c89a1f000002, i(inclusive_tax): nil, e(exclusive_tax): nil, tax_id: nil>
2.0.0-rc2 :016 > a.price
=> "5215b3451d41c89a1f000002"
What is the way to override the setter so things work as expected?
I tried to add a
def price=(val)
super(val)
end
but there is no super for the setter.
Any hint?
What about this work around?
class A
Mongoid::Document
belongs_to :price
def price
Price.find(self[:price]) || calculate_price
end
def calculate_price
#Some logic
end
end
I have a model 'Index' as:
class Index
include Mongoid::Document
belongs_to :project
end
Another model PercentileRankIndex inherits Index
class PercentileRankIndex < Index
def self.model_name
Index.model_name
end
end
Suppose I do :
p = Index.first (OR EVEN) p = PercentileRankIndex.first
I get this :
#<PercentileRankIndex _id: 51630ece34b2613d27000011, project_id: "51630ece34b2613d27000010", enabled: true, _type: "PercentileRankIndex", :enabled: "true">
However on doing
p.project
=>nil
The belongs_to relationship isnt working on child class. Why? How can I fix it?
I have a model with this schema:
class Treatment
include Mongoid::Document
field :value, type: Money # money-rails gem
end
That value field get saved to the db as value: {"cents"=>313, "currency_iso"=>"EUR"}
I would like find all treatments and sort them by the cents value.
Right now this is how I do it:
Treatment.collection.find().sort({value: { :cents => 1 }})
This is using the Moped driver. How can I do this using plain Mongoid?
Edit1.
[6] pry(main)> Treatment.all.only(:value).asc('value.cents').entries
=> [#<Treatment _id: 515854c2a1d24ccb1f000005, value: {"cents"=>2849, "currency_iso"=>"EUR"}>,
#<Treatment _id: 515854c2a1d24ccb1f000006, value: {"cents"=>313, "currency_iso"=>"EUR"}>,
#<Treatment _id: 515854c2a1d24ccb1f00000f, value: {"cents"=>1214, "currency_iso"=>"EUR"}>,
#<Treatment _id: 515854c2a1d24ccb1f000010, value: {"cents"=>1795, "currency_iso"=>"EUR"}>,
#<Treatment _id: 515854c2a1d24ccb1f000011, value: {"cents"=>105, "currency_iso"=>"EUR"}>,
#<Treatment _id: 515854c2a1d24ccb1f000012, value: {"cents"=>2547, "currency_iso"=>"EUR"}>
Edit2.
mongodb: stable 2.4.1-x86_64
mongoid (3.1.2)
Use the dot syntax:
Treatment.all.asc('value.cents')
edit:
Full example:
require 'mongoid'
Mongoid.load!("mongoid.yml", :development)
class Treatment
include Mongoid::Document
field :value, type: Hash
end
Treatment.delete_all
15.times do
Treatment.create(value: {cents: rand(3000), currency_iso: "EUR" })
end
p Treatment.all.only(:value).asc('value.cents').map{|t| t.value["cents"] }
class Account
include Mongoid::Document
include Geocoder::Model::Mongoid
geocoded_by :zip
devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable
before_validation :pass_confirm
after_validation :geocode_check
before_create :assign_subs
field :email, type: String
field :type, type: String
field :zip, type: String
field :oldzip, type: String
field :coordinates, type: Array
field :latitude, type: Float
field :longitude, type: Float
auto_increment :num, collection: :account_nums
index :num, unique: true
has_many :submissions
mount_uploader :photo, PhotoUploader
def self.find_by_num(num)
Account.where(num: num).first
end
protected
def pass_confirm
self.password_confirmation ||= self.password
end
def geocode_check
if self.oldzip != self.zip
self.oldzip = self.zip
self.geocode
end
end
def assign_subs
binding.pry
Submission.where(email: self.email).each do |sub|
sub.zip = self.zip
self.submissions << sub
end
end
end
--
class Submission
include Mongoid::Document
include Mongoid::Search
include Mongoid::Timestamps::Created
include Geocoder::Model::Mongoid
geocoded_by :zip
before_validation :fix_rate
after_validation :geocode
search_in :message, tags: :name
field :email, type: String
field :rate, type: String
field :message, type: String
field :type, type: String
field :zip, type: String
field :coordinates, type: Array
field :latitude, type: Float
field :longitude, type: Float
auto_increment :num, collection: :submission_nums
index :num, unique: true
has_and_belongs_to_many :tags
belongs_to :account
mount_uploader :photo, PhotoUploader
protected
def fix_rate
self.rate = self.rate.sub(/[^\d]*/, '').sub(/(\d*).*/, '\1')
end
end
--
pry(#<Account>)> self.submissions << Submission.first
=> [#<Submission _id: 4e751df86066252059000054, _type: nil, created_at: 2011-09-17 22:23:52 UTC, _keywords: ["tfnwuaty"], email: "krisbltn#gmail.com", rate: "49", message: "tfnwuaty", type: "person", zip: nil, coordinates: nil, latitude: nil, longitude: nil, num: 1, tag_ids: [], account_id: BSON::ObjectId('4e751e0d6066252059000059'), photo: "lawrence.jpg">]
pry(#<Account>)> self.submissions
=> []
as you see above, when trying to add a child document it doesn't get saved. Any ideas as to what could be going on?
Also- this is a has_many / belongs_to relationship, and when I change it to has_and_belongs_to_many it seems to work fine.
My guess is that you've upgraded Mongoid, but haven't read the upgrading docs.
Add , :autosave => true to Account's relation with Submission.
class Account
include Mongoid::Document
has_many :submissions, :autosave => true
end
class Submission
include Mongoid::Document
belongs_to :account
end
Account.delete_all
Submission.delete_all
Submission.create
account = Account.new
account.submissions << Submission.first
account.save
Submission.first.account == account
This was also submitted as a GitHub issue. Tsk tsk.