ruby 通过Rails查询接口在查询中添加“and”和“or”子句时出现问题

m2xkgtsf 于 2023-06-22 发布在 Ruby

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我试图通过Rails查询接口运行以下查询，但无法转换我的逻辑。查询是

Select f.* from feeds f
Left join feed_items fi on fi.id = f.feedable_id
where 
  f.feedable_type in ('Homework', 'Datesheet')
  and
  (
    (fi.assignable_type = 'Level' and assignable_id IN (1)) or
    (fi.assignable_type = 'Student' and assignable_id IN (1)) or
    (fi.assignable_type = 'Section' and assignable_id IN (1)) 
  )

场景：

我收到以下参数散列在我的行动包含过滤器将被动态添加在我的查询

{"page"=>"1", "limit"=>"2", "type_filter"=>["Homework", "Datesheet"], "assignable_filter"=>{"Student"=>"[2]", "Section"=>"[1]", "Level"=>"[1]"}}

到目前为止，我所做的是连接表并为类型filter添加where子句，但不确定如何动态添加assignable_filters。下面是我的rails代码，options在下面的代码中是params

def get_feeds(options)
    base = Feed.includes(:feed_item)
    base = add_type_filters base, options
    base = add_assignable_filters base, options
    format_response base, options
end

def add_type_filters(base, options)
    type_filter = options[:type_filter]
    if !type_filter.nil? and type_filter.length > 0
      base = base.where('feedable_type IN (?)', options[:type_filter])
    end
    base
end

def add_assignable_filters(base, options)
    assignable_filter = options[:assignable_filter]
    if !assignable_filter.nil?
      assignable_filter.each do |key, value|
        # code for adding filters combined with or conditions
      end
      # wrap the or conditions and join them with an and in main where clause
    end
    base
end

P.S我正在使用Rails 5

ruby

来源：https://stackoverflow.com/questions/45411104/trouble-adding-and-and-or-clauses-in-query-through-rails-query-interface

1条答案

按热度按时间

w9apscun1#

没有直接的方法来动态构建查询。我不得不构造where字符串来解决这个问题。我目前的解决方案是

def get_feeds(options)
    params_hash = {}
    type_filters = add_type_filters options, params_hash
    assignable_filters = add_assignable_filters options, params_hash

    where = type_filters
    where = where ? "#{where} and (#{assignable_filters})" : assignable_filters

    base = Feed.eager_load(:feed_item).where(where, params_hash)
    format_response base, options
end

def add_type_filters(options, params_hash)
    type_filter = options[:type_filter]
    type_filter_sql = nil
    if !type_filter.nil? and type_filter.length > 0
      type_filter_sql = 'feeds.feedable_type in (:type_filter)'
      params_hash[:type_filter] = type_filter
    end
    type_filter_sql
end

def add_assignable_filters(options, params_hash)
    assignable_filter_sql = []
    assignable_filter = options[:assignable_filter]
    if !assignable_filter.nil?
      assignable_filter.each do |key, value|
        assignable_filter_sql.push("(feed_items.assignable_type = '#{key}' and feed_items.assignable_id IN (:#{key}))")
        params_hash[key.to_sym] = JSON.parse(value)
      end
    end
    assignable_filter_sql.join(' or ')
end

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ruby 通过Rails查询接口在查询中添加“and”和“or”子句时出现问题

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