我正在尝试构建一个呼叫跟踪应用程序，以此来学习rails和twilio。现在，我想做的是制作一个图表，显示每天特定手机的电话数量。
我的数据结构设置方式是手机型号有多次调用。
在我的手机型号中，我有
def total_on(date)
self.calls.where("placed_at >= ? AND placed_at <= ?", date.beginning_of_day, date.end_of_day)
end
在我看来，我有以下javascript：
<script type="text/javascript" charset="utf-8">
$(function () {
new Highcharts.Chart({
chart: { renderTo: 'calls_chart' },
title: { text: 'Calls Per Day' },
xAxis: { type: 'datetime' },
yAxis: {
title: { text: ' Calls'}
},
series: [{
name: "<%= @phone.name %>",
pointInterval: <%= 6.days * 1000 %>,
pointStart: <%= 1.month.ago.at_midnight.to_i * 1000 %>,
data: <%= (1.month.ago.to_date..Date.today).map { |date| @phone.total_on(date).to_f}.inspect %>
}]
});
});
重要的部分是数据：
<%= (1.month.ago.to_date..Date.today).map { |date| @phone.total_on(date).to_f}.inspect %>
当我尝试每天拨打电话数据时，我收到错误
undefined method `to_f' for #<ActiveRecord::Relation:0x472d0a0>
说实话，我不确定我是否在这里做任何事情。 stackoverflower的伙伴帮我制作了上面引用的Instance Method，所以我假设它比我写的要好很多。
那么，在视图中，我需要更改哪些内容才能拨打特定日期的电话号码？
更新
在Zack的回答之后，我现在得到了错误
SQLite3::SQLException: no such column: calls.placed_at: SELECT COUNT(*) FROM "calls" WHERE "calls"."phone_id" = 44 AND ("calls"."placed_at" BETWEEN '2012-09-11 00:00:00.000000' AND '2012-09-11 23:59:59.999999')
可能我混淆了我所拥有的关联或其他东西。以下是具有数据结构的模型，如果它们有帮助 -
手机型号
# == Schema Information
#
# Table name: phones
#
# id :integer not null, primary key
# name :string(255)
# twilio_number :integer
# original_number :integer
# user_id :integer
# created_at :datetime not null
# updated_at :datetime not null
#
class Phone < ActiveRecord::Base
attr_accessible :original_number, :user_id, :name, :twilio_number
belongs_to :user
has_many :calls, dependent: :destroy
validates :name, presence: true
validates :twilio_number, presence: true
validates :original_number, presence: true
validates :user_id, presence: true
default_scope order: 'phones.created_at DESC'
validate :check_phone_limit, :on => :create
def check_phone_limit
if User.find(self.user_id).at_max_phone_limit?
self.errors[:base] << "Cannot add any more phones"
end
end
def original_number=(value)
num = value.to_s.gsub(/[^0-9+]/, "")
write_attribute(:original_number, num.to_i)
end
def total_on(date)
self.calls.where(placed_at: date.beginning_of_day..date.end_of_day).count
end
end
致电型号
# == Schema Information
#
# Table name: calls
#
# id :integer not null, primary key
# AccountSid :string(255)
# From :string(255)
# To :string(255)
# CallStatus :string(255)
# ApiVersion :string(255)
# Direction :string(255)
# FromCity :string(255)
# FromState :string(255)
# FromZip :string(255)
# FromCountry :string(255)
# ToCity :string(255)
# ToState :string(255)
# ToZip :string(255)
# ToCountry :string(255)
# CallSid :string(255)
# DialCallSid :string(255)
# DialCallDuration :string(255)
# DialCallStatus :string(255)
# RecordingUrl :string(255)
# phone_id :integer
# DialCallMinutes :integer
# created_at :datetime
# updated_at :datetime
#
class Call < ActiveRecord::Base
attr_accessible :AccountSid, :From, :To, :CallStatus, :ApiVersion, :Direction, :FromCity, :FromState, :FromZip, :FromCountry, :ToCity, :ToState, :ToZip, :ToCountry, :CallSid, :DialCallSid, :DialCallDuration, :DialCallStatus, :RecordingUrl, :DialCallMinutes
belongs_to :phone
def self.create_from_incoming_call(params)
user_phone = Phone.find_by_twilio_number(params['To']) #Finds the phone number in the database based on what phone Twilio is calling
twilio_request_params = {
:CallSid => params['CallSid'],
:AccountSid => params['AccountSid'],
:From => params['From'],
:To => params['To'],
:CallStatus => params['CallStatus'],
:ApiVersion => params['ApiVersion'],
:Direction => params['Direction'],
:FromCity => params['FromCity'],
:FromState => params['FromState'],
:FromZip => params['FromZip'],
:FromCountry => params['FromCountry'],
:ToCity => params['ToCity'],
:ToState => params['ToState'],
:ToZip => params['ToZip'],
:ToCountry => params['ToCountry']
}
call = Call.new(twilio_request_params)
call.save
return call
end
def Call.update_dial_call(params)
twilio_request_params = {
:DialCallSid => params['DialCallSid'],
:DialCallDuration => params['DialCallDuration'],
:DialCallStatus => params['DialCallStatus'],
:RecordingUrl => params['RecordingUrl'],
:DialCallMinutes => (params['DialCallDuration'].to_f/60.to_f).ceil
}
call = Call.where( :CallSid => params['CallSid'] ).first
call.update_attributes twilio_request_params
call.save
end
end
电话显示操作
def show
@user = current_user
@phone = Phone.find_by_id(params[:id])
@calls = @phone.calls.paginate(page: params[:page])
end
并且，视图中的javascript（重复以便于阅读）
<script type="text/javascript" charset="utf-8">
$(function () {
new Highcharts.Chart({
chart: { renderTo: 'calls_chart' },
title: { text: 'Calls Per Day' },
xAxis: { type: 'datetime' },
yAxis: {
title: { text: ' Calls'}
},
series: [{
name: "<%= @phone.name %>",
pointInterval: <%= 6.days * 1000 %>,
pointStart: <%= 1.month.ago.at_midnight.to_i * 1000 %>,
data: <%= (1.month.ago.to_date..Date.today).map { |date| @phone.total_on(date).to_f}.inspect %>
}]
});
});
</script
＆GT;
答案 0 :(得分：2)
您的total_on方法正在返回关联，而不是数字。
尝试追加.count：
def total_on(date)
calls.where("placed_at >= ? AND placed_at <= ?", date.beginning_of_day, date.end_of_day).count
end
你也可以给它一个日期范围来缩短方法（实际上相同，但更容易阅读）：
def total_on(date)
calls.where(placed_at: date.beginning_of_day..date.end_of_day).count
end
<强>更新
原始的“placement_at”查询是否有效，或者由于NoMethodError而未实际调用过它？
您的模型中似乎没有placed_at列，但我认为您也可以使用created_at。
如果您想使用placed_at，可以定义此方法（我将名称更改为placed_on的样式）：
class Call < ActiveRecord::Base
def self.placed_on(date)
where(created_at: date.beginning_of_day..date.end_of_day)
end
end
您可以将其链接到total_on方法：
class Phone < ActiveRecord::Base
def total_on(date)
calls.placed_on(date).count
end
end