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不同我有這個類的Rails範圍工作在規範和控制檯
class Invoice < ActiveRecord::Base
scope :last_with_number, -> (firm) {firm.invoices.where('number IS NOT NULL').order("number ASC").last}
end
當我在控制檯中運行Invoice.last_with_number(Firm.first).number
,我得到這個錯誤
2.0.0p247 :001 > Invoice.last_with_number(Firm.first).number
Firm Load (1.5ms) SELECT "firms".* FROM "firms" ORDER BY "firms"."id" ASC LIMIT 1
Invoice Load (3.1ms) SELECT "invoices".* FROM "invoices" WHERE "invoices"."firm_id" = $1 AND (number IS NOT NULL) ORDER BY number DESC LIMIT 1 [["firm_id", 1]]
NoMethodError: Invoice Load (0.7ms) SELECT "invoices".* FROM "invoices"
undefined method `number' for #<ActiveRecord::Relation::ActiveRecord_Relation_Invoice:0x00000008793198>
但該規範經過
describe Invoice do
let(:firm) {FactoryGirl.create(:firm)}
let(:invoice1) {FactoryGirl.create(:invoice, customer:customer, firm:firm , number: 2)}
let(:invoice2) {FactoryGirl.create(:invoice, customer:customer, firm:firm , number:3)}
it 'gets the last numberd invoice for spesific firm' do
invoice1
invoice2
Invoice.last_with_number(firm).number.should eq 3
end
end
我可以通過像這樣的Invoice類方法來解決這個問題
def self.the_really_last(firm)
last_with_number(firm).last
end
與變革
scope :last_with_number, -> (firm) {firm.invoices.where('number IS NOT NULL').order("number ASC").last}
到
scope :last_with_number, -> (firm) {firm.invoices.where('number IS NOT NULL').order("number ASC")}
此範圍將工作這兩個地方。
但是,爲什麼示波器和控制檯中的示波器的行爲不同?
對不起,只是一個錯字從不使用
last
first
或all
。 –難道你有可能解釋這個錯誤的其他拼寫錯誤嗎?無論如何,控制檯顯示正確的行爲。我會在你的規範中做一個'放入Invoice.last_with_number(公司)'來看看你得到了什麼樣的對象以及爲什麼'number'方法存在。如果它不是'Relation',那麼我會仔細檢查你的範圍定義。 –
隔離一點:當我在'範圍末尾運行'.last'的規格時,它會通過。如果我刪除最後一個並運行規範,我會爲#獲取'undefined method'number'。這裏的問題是一個範圍應該返回一個ActiveRecord :: Relation。但是,當我運行規範時不會。爲什麼? –