I have a form that has a category model and and embeded docuement called "FieldModule" and this has embedded document called "SubFieldModule"
For example
class Category
include MongoMapper::Document
key :name, String
many :field_modules
end
class FieldModule
include MongoMapper::EmbeddedDocument
key :name, String
many :sub_field_modules
end
class SubFieldModule
include MongoMapper::EmbeddedDocument
key :name, String
end
In my controller i edit action i have :
#category = Category.find(params[:id])
3.times do
#category.field_modules << FieldModule.new()
end
To set up 3 FieldModules for the category.
I want to be able to do the same for each FieldModules SubFieldModules like so
#category.field_modules.each do |mf|
mf << SubFieldModule.new()
end
but it doesnt work.
i get error:
NoMethodError in Sub categoriesController#edit
undefined method `<<' for #<FieldModule name: nil, _id: $oid4c2b9f594248ce19f000011b>
Anyone help me out on this ? as i then need to take it one level deeper doing the same.
Try this:
#cat = Category.new(:name => "Blah")
3.times do
#cat.field_modules << FieldModule.new()
end
#cat.field_modules.each do |mf|
mf.sub_field_modules << SubFieldModule.new()
end
Related
here is my code:
Perk not save on multiple select,when multiple true/false. perk save and habtm working.
class Perk < ActiveRecord::Base
has_and_belongs_to_many :companies
end
class Company < ActiveRecord::Base
has_and_belongs_to_many :perks
end
view perk/new.html.erb
<%= select_tag "company_id", options_from_collection_for_select(Company.all, 'id', 'name',#perk.companies.map{ |j| j.id }), :multiple => true %>
<%= f.text_field :name %>
Controller's code:
def new
#perk = Perk.new
respond_with(#perk)
end
def create
#perk = Perk.new(perk_params)
#companies = Company.where(:id => params[:company_id])
#perk << #companies
respond_with(#perk)
end
Your select_tag should return an array of company_ids:
<%= select_tag "company_ids[]", options_from_collection_for_select(Company.all, 'id', 'name',#perk.companies.map{ |j| j.id }), :multiple => true %>
http://apidock.com/rails/ActionView/Helpers/FormTagHelper/select_tag#691-sending-an-array-of-multiple-options
Then, in your controller, reference the company_ids param:
#companies = Company.where(:id => params[:company_ids])
(I assume that you've intentionally left out the #perk.save call in your create action... Otherwise, that should be included as well. Model.new doesn't store the record.)
It sounds like you may not have included company_id in the perk_params method in your controller. Rails four uses strong pramas this means you need to state the params you are allowing to be set.However it is difficult to say for sure without seeing more of the code.
In your controller you should see a method like this (there may be more options that just :name):
def perk_params
params.require(:perk).permit(:name)
end
You should try adding :company_id to it so it looks something like this:
def perk_params
params.require(:perk).permit(:name, :company_id)
end
if there are other params int your method leave them in and just added :company_id
EDIT to original answer
The above will only work on a one-to-many or one-to-one because you are using has_and_belongs_to_many you will need to add companies: [] to the end of your params list like this
def perk_params
params.require(:perk).permit(:name, companies: [] )
end
or like this
def perk_params
params.require(:perk).permit(:name, companies_ids: [] )
end
See these links for more details:
http://edgeapi.rubyonrails.org/classes/ActionController/StrongParameters.html
http://edgeguides.rubyonrails.org/action_controller_overview.html#strong-parameters
What is the purpose of defining methods inside a model like the example here? What does this get me? I was under the impression that only the fields of a model are defined in the model.
class Bean
include Mongoid::Document
field :name, type: String
field :roast, type: String
field :origin, type: String
field :quantity, type: Float
has_many :pairings
# has_many :pastries
def pastries
Pastry.find pastry_ids
end
#accepts_nested_attributes_for :pastries
def pastry_ids
pastry_ids_array = []
self.pairings.each do |one_pairing|
if one_pairing.pastry_id
pastry_ids_array.push one_pairing.pastry_id
end
end
pastry_ids_array
end
def pastry_ids=(list)
self.pairings.destroy
list.each do |pastry_id|
self.pairings.create(pastry_id: pastry_id)
end
end
# some way of showing a list
def pastry_list
pastries_string = ""
pastries.each do |one_pastry|
pastries_string += ", " + one_pastry.name
end
pastries_string.slice(2,pastries_string.length - 1)
pastries_string
end
end
I don't know if you know enough ruby but let's say you don't. This is a basic Class question? Defining methods on a model it's like having an helper. Let's say that you have
class CanadianPopulation
attr_accessor :population, :number_of_french_speaker, :number_of_english_speaker
def initialize(a,b,c)
#population = a
#number_of_french_speaker = b
#number_of_english_speaker = c
end
def total_people_that_have_a_different_mother_tongue
#Canadian who speak english or french but have a different mother tongue
self.population - (self.number_of_french_speaker + self.number_of_english_speaker)
end
end
census_2014 = CanadianPopulation.new(34_000_000, 4_000_000, 12_000_000)
let's say that you didn't have the method total_people_that_have_a_different_mother_tonguehow will you do to retrieve the total number of Canadians that have a different mother tongue? you will do the caculation yourself like for a view
<p>Canadian who speak english or french but have a different mother tongue
<br>
<%= #census = #census.population - (#census.number_of_english_speaker + #census.number_of_french_speaker) %>
</p>
Your view or your controller shouldn't do much logic (calculations) so that's one of the reason why you have a method inside the model (or class) it should be like this
<p>Canadian who speak english or french but have a different mother tongue
<br>
<%= #census.total_people_that_have_a_different_mother_tongue %>
</p>
For the second part of your question what does those methods do. rails c -s on your terminal than call or create a new instance model Bean and check to see what it does (the output/results)
Bean.first
b = _
b.pastries
b.pastry_ids
b.pastry_list
edit: #paul-richer recommends to maintain a thin controller
So I am trying to implement multiple autocomplete using this gem and simple_form and am getting an error.
I tried this:
<%= f.input_field :neighborhood_id, collection: Neighborhood.order(:name), :url => autocomplete_neighborhood_name_searches_path, :as => :autocomplete, 'data-delimiter' => ',', :multiple => true, :class => "span8" %>
This is the error I get:
undefined method `to_i' for ["Alley Park, Madison"]:Array
In my params, it is sending this in neighborhood_id:
"search"=>{"neighborhood_id"=>["Alley Park, Madison"],
So it isn't even using the IDs for those values.
Does anyone have any ideas?
Edit 1:
In response to #jvnill's question, I am not explicitly doing anything with params[:search] in the controller. A search creates a new record, and is searching listings.
In my Searches Controller, create action, I am simply doing this:
#search = Search.create!(params[:search])
Then my search.rb (i.e. search model) has this:
def listings
#listings ||= find_listings
end
private
def find_listings
key = "%#{keywords}%"
listings = Listing.order(:headline)
listings = listings.includes(:neighborhood).where("listings.headline like ? or neighborhoods.name like ?", key, key) if keywords.present?
listings = listings.where(neighborhood_id: neighborhood_id) if neighborhood_id.present?
#truncated for brevity
listings
end
First of all, this would be easier if the form is returning the ids instead of the name of the neighborhood. I haven't used the gem yet so I'm not familiar how it works. Reading on the readme says that it will return ids but i don't know why you're only getting names. I'm sure once you figure out how to return the ids, you'll be able to change the code below to suit that.
You need to create a join table between a neighborhood and a search. Let's call that search_neighborhoods.
rails g model search_neighborhood neighborhood_id:integer search_id:integer
# dont forget to add indexes in the migration
After that, you'd want to setup your models.
# search.rb
has_many :search_neighborhoods
has_many :neighborhoods, through: :search_neighborhoods
# search_neighborhood.rb
belongs_to :search
belongs_to :neighborhood
# neighborhood.rb
has_many :search_neighborhoods
has_many :searches, through: :search_neighborhoods
Now that we've setup the associations, we need to setup the setters and the attributes
# search.rb
attr_accessible :neighborhood_names
# this will return a list of neighborhood names which is usefull with prepopulating
def neighborhood_names
neighborhoods.map(&:name).join(',')
end
# we will use this to find the ids of the neighborhoods given their names
# this will be called when you call create!
def neighborhood_names=(names)
names.split(',').each do |name|
next if name.blank?
if neighborhood = Neighborhood.find_by_name(name)
search_neighborhoods.build neighborhood_id: neighborhood.id
end
end
end
# view
# you need to change your autocomplete to use the getter method
<%= f.input :neighborhood_names, url: autocomplete_neighborhood_name_searches_path, as: :autocomplete, input_html: { data: { delimiter: ',', multiple: true, class: "span8" } %>
last but not the least is to update find_listings
def find_listings
key = "%#{keywords}%"
listings = Listing.order(:headline).includes(:neighborhood)
if keywords.present?
listings = listings.where("listings.headline LIKE :key OR neighborhoods.name LIKE :key", { key: "#{keywords}")
end
if neighborhoods.exists?
listings = listings.where(neighborhood_id: neighborhood_ids)
end
listings
end
And that's it :)
UPDATE: using f.input_field
# view
<%= f.input_field :neighborhood_names, url: autocomplete_neighborhood_name_searches_path, as: :autocomplete, data: { delimiter: ',' }, multiple: true, class: "span8" %>
# model
# we need to put [0] because it returns an array with a single element containing
# the string of comma separated neighborhoods
def neighborhood_names=(names)
names[0].split(',').each do |name|
next if name.blank?
if neighborhood = Neighborhood.find_by_name(name)
search_neighborhoods.build neighborhood_id: neighborhood.id
end
end
end
Your problem is how you're collecting values from the neighborhood Model
Neighborhood.order(:name)
will return an array of names, you need to also collect the id, but just display the names
use collect and pass a block, I beleive this might owrk for you
Neighborhood.collect {|n| [n.name, n.id]}
Declare a scope on the Neighborhood class to order it by name if you like to get theat functionality back, as that behavior also belongs in the model anyhow.
edit>
To add a scope/class method to neighborhood model, you'd typically do soemthing like this
scope :desc, where("name DESC")
Than you can write something like:
Neighborhood.desc.all
which will return an array, thus allowing the .collect but there are other way to get those name and id attributes recognized by the select option.
I've a mongoid embedded one to one model in a Rails app (User --> Watchlist) :
class User
include Mongoid::Document
field :name, :type => String
field :email, :type => String
embeds_one :watchlist
def self.create_with_omniauth(auth)
conn = FaradayStack.build 'https://api.github.com'
resp = conn.get '/users/octocat/watched'
create! do |user|
user.name = auth["user_info"]["name"]
user.email = auth["user_info"]["email"]
resp.body.each do |repo|
user.build_watchlist(html_url: "#{repo['html_url']}")
end
end
end
end
class Watchlist
include Mongoid::Document
field :html_url
embedded_in :user
end
Now resp.body, in User model is an Arry which contains several elements ( 2 in this case ):
ruby-1.9.2-p136 :061 > pp resp.body.length
2
=> 2
ruby-1.9.2-p136 :054 > resp.body.each do |repo|
ruby-1.9.2-p136 :055 > pp repo['html_url']
ruby-1.9.2-p136 :056?> end
"https://github.com/octocat/Hello-World"
"https://github.com/octocat/Spoon-Knife"
which I expect to save in the db at the end of self.create_with_omniauth(auth) method, anyway I just get one, nested "watchlist" child :
> db.users.find()
{
"_id" : ObjectId("4e1844ee1d41c843c7000003"),
"name" : "Luca G. Soave",
"email" : "luca.soave#gmail.com",
"watchlist" : { "html_url" : "https://github.com/octocat/Spoon-Knife",
"_id" : ObjectId("4e1844ee1d41c843c7000002") }
}
>
Pretty sure something goes wrong with this part of code:
resp.body.each do |repo|
user.build_watchlist(html_url: "#{repo['html_url']}", description: "#{repo['description']}")
end
... which probably cicles for the n. array elements and exit, wich also mean the last element is saved into the DB at the end of create! method,
... but I've not idea on how to decoupling that ...
Do you have a suggestion ?
I just get one, nested "watchlist" child.
You're only getting one watchlist because that's what you told Mongoid you have:
class User
embeds_one :watchlist # only one watchlist
end
If you want more than one watchlist, you need to change your model:
class User
embeds_many :watchlists
end
it helps if you use the term matching the collection you seek
embeds_many :watches
or
has_one :watchlist (but class Watchlist will in turn embeds_many :watch)
I have an object now:
class Items
attr_accessor :item_id, :name, :description, :rating
def initialize(options = {})
options.each {
|k,v|
self.send( "#{k.to_s}=".intern, v)
}
end
end
I have it being assigned as individual objects into an array...
#result = []
some loop>>
#result << Items.new(options[:name] => 'name', options[:description] => 'blah')
end loop>>
But instead of assigning my singular object to an array... how could I make the object itself a collection?
Basically want to have the object in such a way so that I can define methods such as
def self.names
#items.each do |item|
item.name
end
end
I hope that makes sense, possibly I am overlooking some grand scheme that would make my life infinitely easier in 2 lines.
A few observations before I post an example of how to rework that.
Giving a class a plural name can lead to a lot of semantic issues when declaring new objects, as in this case you'd call Items.new, implying you're creating several items when in fact actually making one. Use the singular form for individual entities.
Be careful when calling arbitrary methods, as you'll throw an exception on any misses. Either check you can call them first, or rescue from the inevitable disaster where applicable.
One way to approach your problem is to make a custom collection class specifically for Item objects where it can give you the information you need on names and such. For example:
class Item
attr_accessor :item_id, :name, :description, :rating
def initialize(options = { })
options.each do |k,v|
method = :"#{k}="
# Check that the method call is valid before making it
if (respond_to?(method))
self.send(method, v)
else
# If not, produce a meaningful error
raise "Unknown attribute #{k}"
end
end
end
end
class ItemsCollection < Array
# This collection does everything an Array does, plus
# you can add utility methods like names.
def names
collect do |i|
i.name
end
end
end
# Example
# Create a custom collection
items = ItemsCollection.new
# Build a few basic examples
[
{
:item_id => 1,
:name => 'Fastball',
:description => 'Faster than a slowball',
:rating => 2
},
{
:item_id => 2,
:name => 'Jack of Nines',
:description => 'Hypothetical playing card',
:rating => 3
},
{
:item_id => 3,
:name => 'Ruby Book',
:description => 'A book made entirely of precious gems',
:rating => 1
}
].each do |example|
items << Item.new(example)
end
puts items.names.join(', ')
# => Fastball, Jack of Nines, Ruby Book
Do you know the Ruby key word yield?
I'm not quite sure what exactly you want to do. I have two interpretations of your intentions, so I give an example that makes two completely different things, one of them hopefully answering your question:
class Items
#items = []
class << self
attr_accessor :items
end
attr_accessor :name, :description
def self.each(&args)
#items.each(&args)
end
def initialize(name, description)
#name, #description = name, description
Items.items << self
end
def each(&block)
yield name
yield description
end
end
a = Items.new('mug', 'a big cup')
b = Items.new('cup', 'a small mug')
Items.each {|x| puts x.name}
puts
a.each {|x| puts x}
This outputs
mug
cup
mug
a big cup
Did you ask for something like Items.each or a.each or for something completely different?
Answering just the additional question you asked in your comment to tadman's solution: If you replace in tadman's code the definition of the method names in the class ItemsCollection by
def method_missing(symbol_s, *arguments)
symbol, s = symbol_s.to_s[0..-2], symbol_s.to_s[-1..-1]
if s == 's' and arguments.empty?
select do |i|
i.respond_to?(symbol) && i.instance_variables.include?("##{symbol}")
end.map {|i| i.send(symbol)}
else
super
end
end
For his example data you will get following outputs:
puts items.names.join(', ')
# => Fastball, Jack of Nines, Ruby Book
puts items.descriptions.join(', ')
# => Faster than a slowball, Hypothetical playing card, A book made entirely of precious gems
As I don't know about any way to check if a method name comes from an attribute or from another method (except you redefine attr_accessor, attr, etc in the class Module) I added some sanity checks: I test if the corresponding method and an instance variable of this name exist. As the class ItemsCollection does not enforce that only objects of class Item are added, I select only the elements fulfilling both checks. You can also remove the select and put the test into the map and return nil if the checks fail.
The key is the return value. If not 'return' statement is given, the result of the last statement is returned. You last statement returns a Hash.
Add 'return self' as the last line of initialize and you're golden.
Class Item
def initialize(options = {})
## Do all kinds of stuff.
return self
end
end