problem on subtract one year from current year in ruby on rails

rubyonrails-talk
1

For the ruby on rails application. i have to generate last one year report. so i think just do like this.

Take the current system data, then subtract one year, den select data from MySQL with this new date.

my question is how to subtract one year from current date in ruby, basically the format of date in MySql is YYYY-MM-DD. so how to subtract one year from this.

i tried one…

time = Time.new

**puts ddat = time.strftime(“%d-%m-%Y”) **

here just i change dat format to DD-MM-YYYY, and then try to subtract 1. But it shows error…

how to solve this…? and have any problem in this logic…?

2

last_year = Time.now.ago(1.year)   records = MyModel.all(:conditions => ["my_date_field > ?", last_year])

Have a look at the api commands around dates and times: http://api.rubyonrails.org/classes/Time.html

3

can you try like this way

time.to_s

I hope it may work

bye:)

4

For the ruby on rails application. i have to generate last one year report.

my question is how to subtract one year from current date in ruby, basically

the format of date in MySql is YYYY-MM-DD. so how to subtract one year from

this.

i tried one…

time = Time.new

puts ddat = time.strftime(“%d-%m-%Y”)

last_year = Time.now.ago(1.year)

for me, the following is much clearer

last_year = 1.year.ago

5

in my machine i dn’t have the local application setup. so just i try this two for display that

**puts last_year = Time.now.ago(1.year) **or last_year = 1.year.ago

but it gives error undefined method `year’ for 1:Fixnum (NoMethodError). year is builtin…?

6

The 1.year.ago stuff is rails only, so if you were in a pure ruby console it wouldn't work

Fred

7

last_year = 1.year.ago

SELECT count(id) from customers where created_at > “2010-12-13”

In the above query i need to change into a variable **last_year instead of “2010-12-13” **. and how to convert this MySQL query into rails query.

also give me a link to study the rails queries

Thank you

vishnu

8

Read this http://guides.rubyonrails.org/active_record_querying.html

9

Thanks for the reply.

get each month data between year. ie [ 2010-12-13 to 2011-12-13]. here i got this current date and last date in rails. have any idea to select that? i have to fetch the data in each month from database…?

Thank you

vishnu

10

Yes. what have you tried?

11 


**Date.today.month or Time.now.month** to get the month then how will continue. i think about that on how to continue. But i can't proceed. i need to take the each month report from the one year.