In my rails application I am searching for company name and I am using mongodb for backend.
My query for finding company is
#companies = Company.where(name: /#{params[:search]}/i).all
In my db I have company having name "ABC&D Services Inc. (Atlanta Project)" and When I am trying to search this company with giving string "ABC&D Services Inc." it will not return any result. Also if I am trying to search with string "ABC&D Services Inc.(" it gives me error end pattern with unmatched parenthesis
Anyone have idea how to solve this kind of issues with reg-ex. End user can perform search with any input so there is way to handle this?
Regexp.escape escapes special characters:
#companies = Company.where(name: /#{Regexp.escape(#{params[:search]})}/i).all
#companies = Company.where(name: /#{Regexp.escape(params[:search])}/i)
Related
I have an inconsistent url in of the tables.
The sample looks like
https://blue.decibal.com.au/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0
or
https://www.google.com/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0
or
https3A%google.com/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0
For the first URL "blue" is the result but it comes with two domains blue and decibal.
Second one is google.
Third is again google.
My requirement is to parse the url and match it with a look table with domain name which contains blue, google, bing etc.
However, the inconstancy in the URL that's stored in DB is a challenge. Need to write a sql which can identify the match and if there are two domain just pick the first one. The URL can be a sit and not expected to be a standard one.
Appreciate some help.
Are you looking for something like this? If not, I do believe that using the SPLIT as part of your parsing will help, since it then creates an array that you can manipulate. This is an example for Snowflake SQL, not SQL Server. They are both tagged in the OP, so not sure which you are looking for.
WITH x AS (
SELECT REPLACE(url,'3A%','//') as url
FROM (VALUES
('https://blue.decibal.com.au/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0'),
('https://www.google.com/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0'),
('https3A%google.com/Transact?pi=9024&pai=2&ct=0&gi=1950&byo=true&ai=49&pa=289&ppt=0')) as x (url)
)
SELECT split(split_part(split_part(url,'//',2),'/',1),'.') as url_array,
array_construct('google') as google_array,
array_construct('decibal') as decibal_array,
array_construct('bing') as bing_array,
CASE WHEN arrays_overlap(url_array,google_array) THEN 'GOOGLE'
WHEN arrays_overlap(url_array,decibal_array) THEN 'DECIBAL'
WHEN arrays_overlap(url_array,bing_array) THEN 'BING' END as domain_match
FROM x;
I was wondering if there is a way to use a select statement with a where clause similar to this way that does not seem to work for me in Ruby version 2.0/Rails 4.0 trying to retrieve a single record string value of a city where the building name is a certain name:
building_city = Building.select(:city).where(building_name: building).uniq
I have also tried:
building_city = Building.select(:city).where(building_name: building).distinct
Currently I have my code working like this:
building_city = Building.where(building_name: building).first
This grabs an entire Building object, and then I can call the city by doing a:
building_city.city
This works fine with what I am trying to achieve, but I was wondering if there is a smarter way to do this. Specifically, I was wondering if there is a way to grab only the string value of a city where the building name equals a certain building and store it into a variable?
Any help/advice is greatly appreciated! :)
Are you perhaps looking for pluck? Something like:
cities = Building.where(building_name: building).uniq.pluck(:city)
That will perform this SQL:
select distinct city from buildings where building_name = '...'
and give you the cities as an array of strings. You'll still get an array but a quick first call will take care of that if you're certain that there will only be one entry.
building_city = Building.select(:city, :building_name).where(building_name: building).uniq — you need to include the building_name
city = Building.where(building_name: building).pick(:city)
Rails 6 introduced pick method with works like where(..).pluck(..).first. Docs
I'm implementing the Filterrific gem for a tournament calendar application.
I took the code from the demo 'Student' application and adapted it to the needs of the tournament calendar application.
I noticed that the search function is searching on the beginning of the search string and not a part of the string.
For example, when I have a tournament called: 'Hamburger Michel 2016', it will find the tournament when I start my search query with 'ham', but when I type 'michel', it will not find the tournament.
I tried to solve this by replacing '*' with '%' in the search scope, like this:
terms = terms.map {|e|
e.gsub('%', '%') + '%').gsub(/%+/, %)
}
But that didn't solve the issue.
Is there a way to search on a part of a string instead of a literal string?
Thanks for your help,
Anthony
Start the search value with *. So, if you want to search for anything that contains michel use: *michel
I am trying to use a wildcard or regular expression to give some leeway with user input in retrieving information from a database in a simple library catalog program, written in Ruby.
The code in question (which currently works if there is an exact match):
puts "Enter the title of the book"
title = gets.chomp
book = $db.execute("SELECT * FROM books WHERE title LIKE ?", title).first
puts %Q{Title:#{book['title']}
Author:#{book['auth_first']} #{book['auth_last']}
Country:#{book['country']}}
I am using SQLite 3. In the SQLite terminal I can enter:
SELECT * FROM books WHERE title LIKE 'Moby%'
or
SELECT * FROM books WHERE title LIKE "Moby%"
and get (assuming there's a proper entry):
Title: Moby-Dick
Author: Herman Melville
Country: USA
I can't figure out any corresponding way of doing this in my Ruby program.
Is it not possible to use the SQL % wildcard character in this context? If so, do I need to use a Ruby regular expression here? What is a good way of handling this?
(Even putting the ? in single quotes ('?') will cause it to no longer work in the program.)
Any help is greatly appreciated.
(Note: I am essentially just trying to modify the sample code from chapter 9 of Beginning Ruby (Peter Cooper).)
The pattern you give to SQL's LIKE is just a string with optional pattern characters. That means that you can build the pattern in Ruby:
$db.execute("SELECT * FROM books WHERE title LIKE ?", "%#{title}%")
or do the string work in SQL:
$db.execute("SELECT * FROM books WHERE title LIKE '%' || ? || '%'", title)
Note that the case sensitivity of LIKE is database dependent but SQLite's is case insensitive so you don't have to worry about that until you try to switch database. Different databases have different ways of dealing with this, some have a case insensitive LIKE, some have a separate ILIKE case insensitive version of LIKE, and some make you normalize the case yourself.
I'm making a webapp where I'm using MongoMapper and Sinatra. I wonder how could I implement a search feature against a DB's collection. I though something like SQL's:
SELECT * FROM posts WHERE match(title) against ("String to search");
How could I achieve this with MongoMapper? Thanks!
ok this is from my project and does work:
Post.where(:title => Regexp.new(/^string/i)) # Limit output with: .limit(10)
Maybe it's the Regexp?
You query for documents that match a case sensitive rooted regular expression:
Post.where(:title => /^stringtosearch/).first
MongoDB does not support full text search so this is the best you can do at the moment.