Question

我在Rails的模型中有这个功能，我假装做的是它返回两个未删除的第一类和一些文章，但是当我运行应用程序时，它给了我这个错误

/Users/juampi/Desktop/iaw2015/app/models/category.rb:14: syntax error, unexpected keyword_end end ^

/Users/juampi/Desktop/iaw2015/app/models/category.rb:16：语法错误，意外的keyword_end结束^

这是模型category.rb

class Category < ActiveRecord::Base
has_many :articles, dependent: :destroy
validates_uniqueness_of :nombre 

def PrimerasDosNoVacias
    cant=0
    aux =0
    cate=["",""]
    categorias = Category.where(eliminado: false)
    while (categorias.length >= aux && cant < 2) 
        if (Article.where(category_id: categorias[aux].id).length != 0)
            cate=categorias[aux]
            cant++
        end 
        aux++
    end
end

end

我调用方法的视图

..      <% categories = Category.PrimerasDosNoVacias %> ..

Answer 1

Ruby不支持++运算符。将其更改为+=1

class Category < ActiveRecord::Base
has_many :articles, dependent: :destroy
validates_uniqueness_of :nombre 

def PrimerasDosNoVacias
    cant=0
    aux =0
    cate=["",""]
    categorias = Category.where(eliminado: false)
    while (categorias.length >= aux && cant < 2) 
        if (Article.where(category_id: categorias[aux].id).length != 0)
            cate=categorias[aux]
            cant+=1
        end 
        aux+=1
    end
end

end

Why doesn't Ruby support i++ or i-- (increment/decrement operators)?

Answer 2

您的while缺少do：

while (categorias.length >= aux && cant < 2) do

Answer 3

Ruby没有++运算符。而不是做例如cant++，cant += 1：

if (Article.where(category_id: categorias[aux].id).length != 0)
  cate = categorias[aux]
  cant += 1
end
aux += 1

Answer 4

问题是调用Category.PrimerasDosNoVacias，因为你直接调用它应该是Class方法的类，因此请尝试： -

class Category < ActiveRecord::Base
    has_many :articles, dependent: :destroy
    validates_uniqueness_of :nombre 
    class << self
        def PrimerasDosNoVacias
            cant=0
            aux =0
            cate=["",""]
            categorias = Category.where(eliminado: false)
            while (categorias.length >= aux && cant < 2) 
                if (Article.where(category_id: categorias[aux].id).length != 0)
                    cate=categorias[aux]
                    cant+=1
                end 
                aux+=1
            end
        end
    end
end

模型中rails上的SyntaxError

4 个答案: