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Ruby on Rails 4
I am trying to join an Array of questions and a grouped by hash together by the question's id.
The Hash is grouped by the question_id attribute of its records from Answers.
The Array has all the Questions, and index is id.
I was trying to put them into an array, #pdf. The question first then the answers by the enumerator index. But it is behaving odd.
#pdf = []
#test = Test.find(params[:id])
#test_questions = #test.questions
answers = Answer.find(:all)
#all_answers = answers.group_by(&:question_id)
#test_questions.each do |q|
#pdf << q
#pdf << #all_answers.select { |i| i == q }
end
The log shows this:
=> [#<Question id: 1, content: "How did the chicken cross the road?", question_type: "MC", category: "ip_voice", product_id: 8, active: true, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14", user_id: 1>, {}, #<Question id: 2, content: "Is this working?", question_type: "TF", category: "ip_voice", product_id: 6, active: true, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53", user_id: 1>, {}]
This is #all_answers:
=> {1=>[#<Answer id: 1, content: "It walked", question_id: 1, correct: false, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">, #<Answer id: 2, content: "It was thrown", question_id: 1, correct: true, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">, #<Answer id: 3, content: "It got run over and pushed", question_id: 1, correct: false, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">], 2=>[#<Answer id: 4, content: "False", question_id: 2, correct: true, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53">, #<Answer id: 5, content: "True", question_id: 2, correct: false, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53">]}
This is #test_questions:
=> #<ActiveRecord::Associations::CollectionProxy [#<Question id: 1, content: "How did the chicken cross the road?", question_type: "MC", category: "ip_voice", product_id: 8, active: true, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14", user_id: 1>, #<Question id: 2, content: "Is this working?", question_type: "TF", category: "ip_voice", product_id: 6, active: true, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53", user_id: 1>]>
I am new to many Rails/Ruby methods.
I think this is the code you need:
#pdf = []
#test = Test.find(params[:id])
#test_questions = #test.questions
answers = Answer.find(:all)
#all_answers = answers.group_by(&:question_id)
#test_questions.each do |q|
#pdf << q
#pdf += #all_answers[q.id]
end
This should create something like:
=> [#<Question id: 1, content: "How did the chicken cross the road?", question_type: "MC", category: "ip_voice", product_id: 8, active: true, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14", user_id: 1>, #<Answer id: 1, content: "It walked", question_id: 1, correct: false, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">, #<Answer id: 2, content: "It was thrown", question_id: 1, correct: true, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">, #<Answer id: 3, content: "It got run over and pushed", question_id: 1, correct: false, created_at: "2014-05-07 17:10:14", updated_at: "2014-05-07 17:10:14">,
#<Question id: 2, content: "Is this working?", question_type: "TF", category: "ip_voice", product_id: 6, active: true, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53", user_id: 1>, #<Answer id: 4, content: "False", question_id: 2, correct: true, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53">, #<Answer id: 5, content: "True", question_id: 2, correct: false, created_at: "2014-05-13 16:10:53", updated_at: "2014-05-13 16:10:53">]
What you probably want to do is to have something like this:
class Test < ActiveRecord::Base
has_many :questions
has_many :answers, :through => :questions
end
class Question < ActiveRecord::Base
belongs_to :test
has_many :answers
end
class Answer < ActiveRecord::Base
belongs_to :question
end
And then do:
test = Test.find(params[:id]).joins(:questions, :answers)
This will fetch questions and answers in one query and you can do things like:
test.questions.first.answers
or
test.answers
and for the pdf:
test.questions.each do |q|
pdf = test.questions.collect do |q|
[q, q.answers]
end
how to select data from database based created_at today in rails?
example :
[#<Event id: 1, customer_id: 1, therapist_id: 1, location_id: 1, service_id: 3, walkin: true, cancel: false, cancel_reason: nil, room_id: 5, starts_at: "2014-04-03 21:31:13", stops_at: nil, created_at: "2014-04-14 10:13:52", updated_at: "2014-04-14 10:13:52">, #<Event id: 2, customer_id: 2, therapist_id: 2, location_id: 2, service_id: 2, walkin: false, cancel: false, cancel_reason: nil, room_id: 1, starts_at: "2014-04-05 21:31:13", stops_at: nil, created_at: "2014-04-14 10:13:52", updated_at: "2014-04-14 10:13:52">, #<Event id: 3, customer_id: 1, therapist_id: 2, location_id: 1, service_id: 1, walkin: false, cancel: false, cancel_reason: nil, room_id: 5, starts_at: "2014-04-07 21:31:13", stops_at: nil, created_at: "2014-04-14 10:13:52", updated_at: "2014-04-14 10:13:52">, #<Event id: 4, customer_id: 2, therapist_id: 2, location_id: 2, service_id: 2, walkin: false, cancel: false, cancel_reason: nil, room_id: 1, starts_at: "2014-04-09 21:31:13", stops_at: nil, created_at: "2014-04-14 10:13:52", updated_at: "2014-04-14 10:13:52">, #<Event id: 5, customer_id: 14, therapist_id: 2, location_id: 2, service_id: 1, walkin: true, cancel: false, cancel_reason: "", room_id: 8, starts_at: "2014-04-15 06:47:00", stops_at: "2014-04-15 07:47:00", created_at: "2014-04-15 06:47:14", updated_at: "2014-04-15 06:47:14">]
and when i collect data based created_at today i get result :
<Event id: 5, customer_id: 14, therapist_id: 2, location_id: 2, service_id: 1, walkin: true, cancel: false, cancel_reason: "", room_id: 8, starts_at: "2014-04-15 06:47:00", stops_at: "2014-04-15 07:47:00", created_at: "2014-04-15 06:47:14", updated_at: "2014-04-15 06:47:14">
how to collect all data where data created_at just today in rails?
thanks before
Please try this:
Event.where("DATE(created_at) = DATE(?)", Time.now)
Please have a try with this code.
Event.where("created_at >= ? and created_at <= ?", Time.now.beginning_of_day, Time.now.end_of_day)
To fetch today's events, it will return only today's events
Event.where("created_at = ?", Date.today)
Here's what I have tried in my console
2.0.0p247 :008 > Article.where("created_at < ?", Date.today)
Article Load (0.5ms) SELECT `articles`.* FROM `articles` WHERE (created_at < '2014-04-15')
=> #<ActiveRecord::Relation [#<Article id: 2, title: "Villa Kerylos: A Greek Dream.. A Modern Villa", description: "An inside look at one of the Mediterranean's most i...", url: "http://frenchantiques.blogspot.com/2009/05/villa-ke...", is_open_in_new_window: true, created_at: "2013-12-26 07:03:17", updated_at: "2013-12-26 10:28:36">, #<Article id: 4, title: "Kenzo Auctions Personal Art Collection", description: "Kenzo Auctions Personal Art Collection", url: "http://frenchantiques.blogspot.com/2009/06/kenzo-au...", is_open_in_new_window: false, created_at: "2013-12-26 09:57:21", updated_at: "2013-12-26 09:57:21">]>
Event.where("created_at > ?" Time.now.to_date.to_time) should work, because you want todays entries. Also, a good Idea, is those of the last 24 hours, which should be Event.where("created_at > ?-60*60*24 and created_at < ?" Time.now)
Event.where('created_at >= ?', Date.today)
Maybe you can parse the created_at to the same short format and compare, but this should be enough.
I want to remove elements from an Active Record collection, for this I'm trying to use delete_if. Below is my collection:
categories = Category.all
groups = Group.all
result = []
groups.each do |g|
result.push({ :name => g[:name], :amount => g[amount_column], :drilldown => [] })
categories.where( { :group_id => g.id } ).each do |c, index|
result.last[:drilldown].push({ :name => c[:name], :amount => c[amount_column], :drilldown => nil })
end
# lastly, remove these categories from this collection (not working)
categories.delete_if {|c| c.group_id == g.id }
# tried this too - categories.select! { |c| c.group_id != g.id }
end
abort(categories.size.inspect)
..I want to do something with the categories of each group, then remove them form the array. After the loop block I'll want to be left with the categories which do not belong to a group - that is why I delete those of each group there. Here is the data for groups and categories when they are first fetched (sorry it's a lot but just to note that some category.group_id and group.id match:
#categories
#<ActiveRecord::Associations::CollectionProxy [#<Category id: 13, name: "Internet", user_id: 1, created_at: "2014-03-09 13:15:19", updated_at: "2014-03-15 05:13:47", amount: #<BigDecimal:7f0c283806e0,'0.0',9(18)>, group_id: nil, amount_in: #<BigDecimal:7f0c28380578,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c283804b0,'0.0',9(18)>>, #<Category id: 15, name: "Electricity", user_id: 1, created_at: "2014-03-09 13:15:39", updated_at: "2014-03-15 05:14:03", amount: #<BigDecimal:7f0c2838f5a0,'0.0',9(18)>, group_id: nil, amount_in: #<BigDecimal:7f0c2838f460,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c2838f2f8,'0.0',9(18)>>, #<Category id: 6, name: "Phone", user_id: 1, created_at: "2014-02-18 10:07:47", updated_at: "2014-03-15 05:16:21", amount: #<BigDecimal:7f0c2838e470,'0.0',9(18)>, group_id: nil, amount_in: #<BigDecimal:7f0c2838e308,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c2838e240,'0.0',9(18)>>, #<Category id: 9, name: "Trains", user_id: 1, created_at: "2014-02-22 03:08:08", updated_at: "2014-03-15 05:16:21", amount: #<BigDecimal:7f0c2838d340,'-0.5E3',9(18)>, group_id: nil, amount_in: #<BigDecimal:7f0c2838d138,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c2838cf08,'-0.5E3',9(18)>>, #<Category id: 5, name: "Resaurants", user_id: 1, created_at: "2014-02-17 12:12:44", updated_at: "2014-03-15 05:16:21", amount: #<BigDecimal:7f0c2839be18,'-0.235E3',9(18)>, group_id: 16, amount_in: #<BigDecimal:7f0c2839bc38,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c2839baa8,'-0.235E3',9(18)>>, #<Category id: 14, name: "Gas", user_id: 1, created_at: "2014-03-09 13:15:27", updated_at: "2014-03-15 05:16:21", amount: #<BigDecimal:7f0c2839a680,'0.0',9(18)>, group_id: 16, amount_in: #<BigDecimal:7f0c2839a3d8,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c2839a1d0,'0.0',9(18)>>, #<Category id: 3, name: "Snowboarding", user_id: 1, created_at: "2014-02-11 09:43:52", updated_at: "2014-03-15 05:16:21", amount: #<BigDecimal:7f0c28398d30,'-0.1111E4',9(18)>, group_id: 16, amount_in: #<BigDecimal:7f0c28398b28,'0.0',9(18)>, amount_out: #<BigDecimal:7f0c28398a38,'-0.1111E4',9(18)>>]>
# groups
#<ActiveRecord::Associations::CollectionProxy [#<Group id: 16, name: "Testing", user_id: 1, amount: #<BigDecimal:31c0ce8,'-0.1346E4',9(18)>, created_at: "2014-03-09 13:48:50", updated_at: "2014-03-15 05:35:57", amount_in: #<BigDecimal:31d3118,'0.0',9(18)>, amount_out: #<BigDecimal:26b9728,'-0.1346E4',9(18)>>, #<Group id: 17, name: "test", user_id: 1, amount: #<BigDecimal:31d2a88,'0.0',9(18)>, created_at: "2014-03-15 05:38:36", updated_at: "2014-03-15 05:39:00", amount_in: #<BigDecimal:31d14f8,'0.0',9(18)>, amount_out: #<BigDecimal:2e4e650,'0.0',9(18)>>]>
.. but my delete_if does nothing (abort shows the same size with or without the delete_if). Please note that there are group.id = 16, and category.group_id = 16 so the delete_if should delete those ones - but it doesn't. Is there anything that I'm doing wrong?
Try this ,I think it will help
categories.delete_if {|x| x.group_id==16}
This will update categories in place, selecting all categories with group_id not equal to g.id.
categories.select! { |c| c.group_id != g.id }
I want my result in this format
data: [{"label":"present","value":35},
{"label":"absent","value":50},
{"label":"leave","value":45},
{"label":"performance","value":67}]
I did try this code
data: <%= #orders.map { |d| {label: d.shipping, value: d.price}}.to_json.html_safe -%>
which gives result
data: [{"label":"present","value":"35"},
{"label":"absent","value":"50"},
{"label":"leave","value":"45"},
{"label":"performance","value":"67"}]
here problem is in the first label present i obtain value "35" in this format but i need value 35 only without "". How could i get this?
my data in #orders is
[#<Order id: 8, price: "35", purchased_at: "2012-01"
, shipping: "present", created_at: "2012-12-13 08:17:39",
updated_at: "2012-12-13 08:50:13">, #<Order id: 9, price
: "50", purchased_at: "2012-02", shipping: "absent", created_at
: "2012-12-13 08:31:24", updated_at: "2012-12-13 08:50:55">,
#<Order id: 12, price: "45", purchased_at: "2012-03", shipping:
"leave", created_at: "2012-12-13 08:48:37", updated_at: "2012-12-13 08:51:07">
, #<Order id: 13, price: "67", purchased_at: "2012-04", shipping:
"performance", created_at: "2012-12-13 08:48:47", updated_at: "2012-12-13 08:51:18">]
data: <%= #orders.map { |d| {label: d.shipping, value: d.price.to_i}}.to_json.html_safe -%>
I have the makings of a method which calculates royalties for ISBNs. It splits sales by sales channel. The royalty rate is determined by the total quantity sold, and the royalty is calculated by multiplying the royalty rate (a percentage) by the total revenue. So the result should be a calculated royalty figure for each sales channel, for each isbn. Forgive what is probably over-commented code.
In the show method of the isbns_controller:
#isbn = Isbn.find(params[:id])
def royalty(isbn)
#royaltiesbychannel = Hash.new()
# Returns all sales for the current isbn, and groups them by channel_id in a hash
# {1 => sale 1, sale 2}, {2 => sale 1, sale 2}
# Then loops through each key-value pair.
#isbn.sales.group_by(&:channel_id).each do |ch_id, sale_array|
# Takes the sales grouped by channel, and totals the quantities and values into two separate variables.
value_total_by_channel = sale_array.sum(&:value)
quantity_total_by_channel = sale_array.sum(&:quantity)
# Gets all the rules for the isbn
#isbn.rules.each do |rule|
# Jumps to the next sales hash unless the channel ids match
next unless rule.channel_id == ch_id
if Range.new(rule.lower,rule.upper).include?(quantity_total_by_channel)
#royaltiesbychannel[ch_id] = value_total_by_channel * rule.rate
end
end
end
end
It's that last line which is giving me a problem. What I want is to produce a hash with the channel ids as the keys, and the calculated royalties as the values. But instead, it's producing a hash with just one key-value pair, in something which looks like this:
{1=>#<BigDecimal:10132a620,'0.875E5',9(36)>}
I suspect there's something wrong with the way I'm creating a new hash at the top of the method, and also with trying to declare the key in the square brackets.
The rule.rate is a percentage expressed as a decimal, e.g. 0.10. The value is an integer (at the moment, at least). Any thoughts on how to generate this hash?
Secondly, what's the best way to iterate through the resultant hash in the view?
Many thanks in advance.
Update - output of .inspect as requested:
{1=>[#<Sale id: 1, isbn_id: 2, quantity: 3000, value: 122000, currency: "", total_quantity: nil, created_at: "2011-05-16 19:52:36", updated_at: "2011-05-22 14:28:33", customer: "WHS", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2011-02-01", rule_id: nil>, #<Sale id: 2, isbn_id: 2, quantity: 500, value: 3000, currency: "", total_quantity: nil, created_at: "2011-05-19 09:55:00", updated_at: "2011-05-19 09:55:00", customer: "Borders", retail_price: nil, discount: nil, channel_id: 1, invoice_date: nil, rule_id: nil>], 2=>[#<Sale id: 6, isbn_id: 2, quantity: 10, value: 2000, currency: "", total_quantity: nil, created_at: "2011-05-19 10:34:34", updated_at: "2011-05-19 11:21:07", customer: "Bookshop a", retail_price: nil, discount: nil, channel_id: 2, invoice_date: nil, rule_id: nil>, #<Sale id: 7, isbn_id: 2, quantity: 2000, value: 4000, currency: "", total_quantity: nil, created_at: "2011-05-19 10:34:49", updated_at: "2011-05-19 10:34:49", customer: "Bookshop b", retail_price: nil, discount: nil, channel_id: 2, invoice_date: nil, rule_id: nil>]}
Second update: revision to the question:
Thanks for your thoughts so far. It turns out the method is working fine, because the hash generated by #isbn.sales.group_by(&:channel_id) only contains one key-value pair. So my question still stands, but for a different bit of my code: how do I perform a find on the Sales model to produce an array of hashes like {1 => sale 1, sale 2}, {2 => sale 1, sale 2}?
I have tried this horrible thing:
#channelarray = Channel.select(:id).all
#salesbychannelwrong = #channelarray.group_by {|i| Sale.where("channel_id = ?",i).where("isbn_id =?", #isbn)}
#salesbychannel = #salesbychannelwrong.invert
which gives this:
{[#<Channel id: 1>]=>[#<Sale id: 1, isbn_id: 2, quantity: 3000, value: 122000, currency: "", total_quantity: nil, created_at: "2011-05-16 19:52:36", updated_at: "2011-05-22 14:28:33", customer: "WHS", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2011-02-01", rule_id: nil>, #<Sale id: 2, isbn_id: 2, quantity: 500, value: 3000, currency: "", total_quantity: nil, created_at: "2011-05-19 09:55:00", updated_at: "2011-05-19 09:55:00", customer: "Borders", retail_price: nil, discount: nil, channel_id: 1, invoice_date: nil, rule_id: nil>], [#<Channel id: 2>]=>[#<Sale id: 6, isbn_id: 2, quantity: 10, value: 2000, currency: "", total_quantity: nil, created_at: "2011-05-19 10:34:34", updated_at: "2011-05-19 11:21:07", customer: "Bookshop a", retail_price: nil, discount: nil, channel_id: 2, invoice_date: nil, rule_id: nil>, #<Sale id: 7, isbn_id: 2, quantity: 2000, value: 4000, currency: "", total_quantity: nil, created_at: "2011-05-19 10:34:49", updated_at: "2011-05-19 10:34:49", customer: "Bookshop b", retail_price: nil, discount: nil, channel_id: 2, invoice_date: nil, rule_id: nil>]}
I have also tried
Sale.find_by_isbn_id(:id).group_by(&:channel_id)
which returns nil
and this
Sale.find_by_isbn_id(#isbn).group_by(&:channel_id)
which returns
undefined method `group_by' for #<Sale:0x0000010122df60>
I have the following models:
class Sale
belongs_to :isbn
belongs_to :channel
...
end
class Isbn
has_many :rules
has_many :sales
has_many :channels, :through => :sales
...
end
class Channel
has_many :sales
has_many :rules
...
end
class Rule
belongs_to :isbn
belongs_to :channel
has_many :sales, :through => :isbn
...
end
Thanks again.
Sale.find_by_isbn_id(#isbn).group_by(&:channel_id) => Sale.find_all_by_isbn_id(#isbn).group_by(&:channel_id)
or
Sale.where(:ibn_id => #isbn.id).group_by(&:channel_id)