Ruby on rails Rspec从prod中运行的类方法返回空数组

我正试图构造一个Rspec套件来测试我的文章类上的“filter”方法。通过第一手的使用，我知道这个类方法在生产环境中可以完美地执行，但在rspec中运行时，它只返回一个空白数组。你知道为什么会这样吗

describe '.filter' do
    it 'filters by user' do
      ActiveRecord::Base.logger = Logger.new(STDOUT) if defined?(ActiveRecord::Base)
      user1 = User.create!(username: 'user1', status: 1)
      article1 = Article.create!(user_id: user1.id)
      Article.filter({writer: 'user1'}).should == article1
    end
  end

这是文章的类过滤器

def self.filter(hash)
    # need to make case insensitive
    hash.delete_if {|k,v| v == ""}
    hash[:writer_type] = (hash[:writer_type]) if hash[:writer_type] != nil
    sql_base = "select distinct articles.* from articles
       join tags
       on tags.article_id = articles.id
       join categories
       on tags.category_id = categories.id
       left outer join itineraries
       on itineraries.article_id = articles.id
       left outer join cities
       on itineraries.city_id = cities.id
       join users
       on users.id = articles.user_id"

    condition_array = []
    key_array = []
    hash.each_key {|key| key_array << key}
    key_array.each_with_index do |key, i|
      operator = "and"
      operator = "where" if i == 0
      case key
      when :writer
        sql_base << "\n#{operator} users.username like ?"
        condition_array << hash[:writer]
      when :writer_type
         sql_base << "\n#{operator} users.status in (?)"
        condition_array << hash[:writer_type]
      when :city
        sql_base << "\n#{operator} cities.name like ?" 
        condition_array << hash[:city]
      when :category
        sql_base << "\n#{operator} categories.name like ?"
        condition_array << hash[:category]
      end
    end
    sql_array = [sql_base,condition_array].flatten
    articles = Article.find_by_sql(sql_array)
    articles
  end

看起来：username不是该方法的参数。我明白了：作家，也许是这个

describe '.filter' do
  it 'filters by user' do
    ActiveRecord::Base.logger = Logger.new(STDOUT) if defined?(ActiveRecord::Base)
    user1 = User.create!(username: 'user1', status: 1)
    article1 = Article.create!(user_id: user1.id)
    expect(Article.filter({writer: user1.username})).to eql([article1])
  end
end

---

抱歉，我写错了-不幸的是：writer作为参数不起作用。那就不确定了。我在该SQL中看到了很多连接，但只有为测试创建的几个对象。在规范中抛出一些调试查询，看看您认为数据库中的内容是否真的是。。。