ruby-on-rails - 简单计算会导致Ruby中的语法错误

Question

我在Ruby中有一个简单的财务应用程序，可以跟踪用户的支出并根据这些支出生成报告。

费用属于不同的类别，这会影响每种费用中的税金。

在生成费用报告的代码中，我有以下内容:

  tax_totals = [0] * 13
  totals = [0] * 13
  expenses.each do |expense|
    tax_ratio = tax_rate/(1+tax_rate)
    category = Category.find(expense.category_id).first
    tax_ratio *= category.tax_rate.to_f / 100
    if !expense.rate_id.nil?
      subcategory = Rate.where("id = ?", expense.rate_id).first
      tax_ratio *= subcategory.tax_rate.to_f
    end
    tax_totals[expense.transaction_date.to_date.month] +=
      (expense.amount * tax_ratio)
    totals[expense.transaction_date.to_date.month] += expense.amount
  end

我在 tax_ratio = tax_rate/(1+tax_rate)上不断收到语法错误:

syntax error, unexpected '(', expecting keyword_end

如果删除该行，则错误将移至 tax_ratio *= category.tax_rate.to_f / 100行:

syntax error, unexpected tINTEGER, expecting keyword_end

我没有想法，这是从哪里来的。我完全看不出代码有什么问题。我在多个函数中有非常相似的代码，每个函数所做的计算略有不同。但是只有一个是一个问题。

也许是因为缺乏咖啡因。这段代码有什么问题吗？文件中是否可能有其他原因导致这种情况？如何进行调试？

干杯!

编辑:我想通了。 Ruby Noob错误。请参阅下面的答案。

Answer 1

如上所述，这是有效的Ruby。我能够将您的代码放入方法中并调用它。见下文:

require 'active_support/all'
require 'rspec'

class Category
  def self.find(category_id)
    [new]
  end

  def tax_rate
    0.5
  end
end

class Rate
  def self.where(*args)
    [new]
  end

  def tax_rate
    0.5
  end
end

def ratio(expenses, tax_rate)
  tax_totals = [0] * 13
  totals = [0] * 13
  expenses.each do |expense|
    tax_ratio = tax_rate/(1+tax_rate)
    category = Category.find(expense.category_id).first
    tax_ratio *= category.tax_rate.to_f / 100
    if !expense.rate_id.nil?
      subcategory = Rate.where("id = ?", expense.rate_id).first
      tax_ratio *= subcategory.tax_rate.to_f
    end
    tax_totals[expense.transaction_date.to_date.month] +=
      (expense.amount * tax_ratio)
    totals[expense.transaction_date.to_date.month] += expense.amount
  end
end


describe "#ratio" do

  let(:expense) do
    double("expense", category_id: 5, rate_id: 6, transaction_date: 5.days.ago, amount: 5)
  end
  let(:expenses) { [expense] }
  let(:tax_rate) { 0.25 }

  it "should run" do
    ratio(expenses, tax_rate)
  end
end