我想创建一个查询链,以便在给定特定过滤器的情况下找到我的机器人用户。某些过滤器可以包含多个值。例如,我的#34; locale"过滤器可以有多个值(例如fr_FR,en_US)。
在此示例中,我检查了两个区域设置复选框(fr_FR和en_US)。
我创建了一个查询链,但输出不是我想要的:
SELECT" bot_users"。* FROM" bot_users" WHERE(" bot_users"。" core_bot_id" =? AND(locale =' fr_FR')OR" bot_users"。" core_bot_id" =? AND(locale =' fr_FR')AND(locale =' en_EN'))[[" core_bot_id",1], [" core_bot_id",1]]
我想要这样的事情:
SELECT" bot_users"。* FROM" bot_users" WHERE(" bot_users"。" core_bot_id" =? AND(locale =' fr_FR' OR' en_EN'))[[" core_bot_id",1]]
以下是代码:
@filter = Filter.find_by_letter_id(@letter.id)
$i = 1
$a = 1
$s = 1
query = [{first_name: @filter.first_name}, {last_name: @filter.last_name}, {source: @filter.segment}, {gender: @filter.gender}, {timezone: @filter.timezone}, {locale: @filter.locale}, {created_at: [@filter.creation_date_start, @filter.creation_date_finish]}]
query_chain = BotUser.where(core_bot_id: @bot.id)
query.each do |hash|
hash.each_pair do |key, value|
if value.present? == true
if key.to_s == "timezone"
while $i < value.size do
query_chain = query_chain.where("timezone = ?", value[$i].to_f)
$i += 1
end
elsif key.to_s == "locale"
while $a < value.size do
puts $a.to_s
if $a == 1
query_chain = query_chain.where("locale = ?", value[$a])
else
query_chain = query_chain.or(query_chain.where("locale = ?", value[$a]))
end
$a += 1
end
elsif key.to_s == "gender"
query_chain = query_chain.where("gender = ?", value)
elsif key.to_s == "core_bot_id"
query_chain = query_chain.where("core_bot_id = ?", value)
elsif key.to_s == "created_at"
if value[0].present? == true and value[1].present? == true
query_chain = query_chain.where('created_at BETWEEN ? AND ?', value[0], value[1].end_of_day)
elsif value[0].present? == true
query_chain = query_chain.where('created_at > ?', value[0])
elsif value[1].present? == true
query_chain = query_chain.where('created_at < ?', value[1].end_of_day)
end
else
query_chain = query_chain.where("#{key} = ?", value)
end
end
end
end
private
def filter_params
params.fetch(:query, {}).permit(:first_name, :last_name, :timezone, :gender)
end
def set_nb_recipients
@filter = Filter.find_by_letter_id(@letter.id)
filter_params = ActionController::Parameters.new({
query: {
core_bot_id: @bot.id,
first_name: @filter.first_name,
last_name: @filter.last_name,
source: @filter.segment,
gender: @filter.gender,
timezone: @filter.timezone,
locale: @filter.locale,
creation_date_start: @filter.creation_date_start,
creation_date_finish: @filter.creation_date_finish
}
})
query = FilterQuery.new(filter_params)
query = FilterQuery.new(filter_params)
@bot_users = query.execute || BotUser.none
@nb_users = @bot_users.length
end
class FilterQuery
include ActiveModel::Model
attr_accessor :first_name, :last_name, :timezone, :gender, :locale, :core_bot_id, :source, :creation_date_start, :creation_date_finish
validates :gender, inclusion: { in: %w(male female) }
def initialize(params)
super(params)
end
def execute
return false unless valid?
@bot_users = BotUser.where(core_bot_id: core_bot_id)
@bot_users = @bot_users.where('first_name LIKE ?', "#{first_name}%") if first_name.present?
@bot_users = @bot_users.where('last_name LIKE ?', "#{last_name}%") if last_name.present?
@bot_users = @bot_users.where(timezone: timezone) if timezone.present?
@bot_users = @bot_users.where(timezone: locale) if locale.present?
@bot_users = @bot_users.where(gender: gender) if gender.present?
@bot_users = @bot_users.where(source: source) if source.present?
@bot_users = @bot_users.where('created_at BETWEEN ? AND ?', creation_date_start, creation_date_finish) if creation_date_start.present? and creation_date_finish.present?
@bot_users = @bot_users.where('created_at > ?', creation_date_start) if creation_date_start.present? and creation_date_finish.present? == false
@bot_users = @bot_users.where('created_at < ?', creation_date_finish) if creation_date_start.present? == false and creation_date_finish.present?
@bot_users
end
end
不幸的是,这不会返回任何东西。我不确定params部分,你能帮帮我吗?我将数据存储在数据库中并从对象中获取参数。
答案 0 :(得分:3)
理想情况下,您希望在查询类中执行所有这些操作。另外,试着调低if / else是的吗?
以下是一个样本的样本,它不完整,但是我已经为你做了一个很好的测量验证:
class FilterQuery
include ActiveModel::Model
attr_accessor :first_name, :last_name, :timezone, :gender
validates :gender, inclusion: { in: %w(male female) }
def initialize(params)
super(params)
end
def execute
return false unless valid?
@bot_users = BotUser.all
@bot_users = @bot_users.where('first_name LIKE ?', "#{first_name}%") if first_name.present?
@bot_users = @bot_users.where('last_name LIKE ?', "#{last_name}%") if last_name.present?
@bot_users = @bot_users.where(timezone: timezone) if timezone.present?
@bot_users = @bot_users.where(gender: gender) if gender.present?
@bot_users
end
end
要使用它,请将其放入您的控制器:
def index
query = FilterQuery.new(filter_params)
@bot_users = query.execute || BotUser.none
end
private
def filter_params
params.fetch(:query, {}).permit(:first_name, :last_name, :timezone, :gender)
end
答案 1 :(得分:3)
我和Jaryl在一起。
减少if/elsif
。您正在寻找的是case。由于您的一堆查询具有相似的结构,因此您可以将它们填充到else
语句的case
子句中。
减少if x? == true
。如果x
有问号,那么它已经返回true
或false
。你不必说if true == true
。简单地说,if x?
。就像,if value[0].present?
。根据您的具体要求,可能也可以跳过present?
部分。如果您只是想防范nil
值,那么您可以if value[0]
。但是,正如工程师在评论中指出的那样,如果你想防止空字符串,散列和数组 - 那么你需要坚持if value[0].present?
。请记住,如果您不打算if
,则可以始终将else
语句放在一行的末尾。像:
query_chain = query_chain.where('created_at > ?', value[0]) if value[0].present?
减少类型转换(key.to_s
)。只需将密钥变量与另一个密钥进行比较。为什么要将它转换为字符串?
减少循环。特别是那些迭代变量和值比较(while $i < value.size
) - 令人讨厌!这样:
while $i < value.size do
query_chain = query_chain.where("timezone = ?", value[$i].to_f)
$i += 1
end
不是惯用语。更好的是:
value.each do |timezone|
query_chain = query_chain.where("timezone = ?", timezone.to_f)
end
当然,您可以使查询更简洁:
value.each do |timezone|
query_chain = query_chain.where(timezone: timezone.to_f)
end
但是,你所做的就是每个循环都将时区转换为_f。那么,为什么不一次性做到这一点并链接一个查询,如:
timezones = value.map{|timezone| timezone.to_f}
query_chain = query_chain.where(timezone: timezones)
当然,你可以保存自己的临时变量赋值,然后执行:
query_chain = query_chain.where(timezone: value.map{|timezone| timezone.to_f})
如果你不介意长(ish)行。
我喜欢Jaryl的方法。但是,如果你想坚持当前的方法,它可能看起来像:
query.each do |hash|
hash.each_pair do |key, value|
if value
case key
when :timezone
query_chain = query_chain.where(timezone: value.map{|timezone| timezone.to_f})
when :created_at
query_chain = query_chain.where('created_at > ?', value[0]) if value[0]
query_chain = query_chain.where('created_at < ?', value[1].end_of_day) if value[1]
else
query_chain = query_chain.where(key => value)
end
end
end
end
这里的Jaryl方法略有不同......
class FilterQuery
attr_accessor :first_name,
:last_name,
:timezone,
:gender,
:locale,
:core_bot_id,
:source,
:creation_date_start,
:creation_date_finish
def initialize(params)
params.each{|k,v| send("#{k}=",v)}
end
def execute
return false unless valid?
@bot_users = BotUser.where(core_bot_id: core_bot_id)
[:first_name, :last_name].each do |var_sym|
val = send(var_sym)
@bot_users = @bot_users.where("#{var_sym} LIKE ?", "#{val}%") if val.present?
end
[:timezone, :locale, :gender, :source].each do |var_sym|
val = send(var_sym)
@bot_users = @bot_users.where(var_sym => val) if val.present?
end
@bot_users = @bot_users.where('created_at > ?', creation_date_start) if creation_date_start.present?
@bot_users = @bot_users.where('created_at < ?', creation_date_finish) if creation_date_finish.present?
@bot_users
end
private
def valid?
%w(male female).include? gender
end
end