ArcGIS and Ruby: Making Web Development Fun and Easy
Jason Wieringa
Goals
- Try Ruby
- Show some libraries that DC team uses
Where is IT Used?
- Github
- Esri Portland
- Open Street Maps
- Esri DC
- Living Social
Community
- User Groups
- Online Chat (IRC)
- So many Books!
- So many tutorials!
Everything is Class
Including Numbers!
irb(main):001:0> 5.class
=> Fixnum
Flexibility
(example from ruby-lang.org)
class Fixnum
def plus(x)
self.+(x)
end
end
Blocks
# Traditional
array = [1,2,3,4]
array.reverse!
array
# With a Block
[1,2,3,4].tap do |array|
array.reverse!
end
More Blocks
[1, 2, 3, 4, 5, 6].select {|num| num % 2 == 0 }.map {|num| num * 2 }
=> [4, 8, 12]
And More blocks!
class Person
attr_accessor :first_name
def initialize(name)
@first_name = name
end
end
people = []
people << Person.new("jason")
people << Person.new("catherine")
people << Person.new("don")
people.each do |person|
puts person.first_name
end
Libraries
RubyGEMS.org
Gems are packages of Ruby that are easily distributable. The Ruby community shares these packages on Rubygems.org.
How Esri DC R&D Uses Ruby
How DC uses Ruby
- Talking with ArcGIS Online (Chain)
- Web applications (Rails)
- Data processing (ffi-ogr)
Talking to The Web
class Agol
attr_accessor :online
def initialize(url)
@online = Chain::Url.new(url)
end
end
agol = Agol.new("https://www.arcgis.com")
# Search Arcgis Online for groups with the term epa
agol.online.sharing.rest.community.groups[f: 'json', q:'epa']
agol.online.sharing.rest.community.users['jwieringa_dcdev'][f: 'json']
# Search Arcgis Online for my groups (requires a token for full results)
# agol.online.sharing.rest.community.users[jwieringa_dcdev][f: 'json', token: token].groups
More Chain
(Not real!!)
def search_groups(params)
arcgis_online.sharing.rest.community.groups(q:'epa', f: 'json', num: 100)).results
end
def my_groups
arcgis_online.sharing.rest.community.users[username][f: 'json', token: token].groups
end
def org_and_my_groups(params)
search_groups(params).concat(my_groups).uniq(&:id)
end
Links
Resources
- Demo Code
- Ruby Tutorials - Jumpstart Labs
- StackOverflow
- Rails and Rails Screencasts
- The Documentation!
- Ruby Tapas
Thank YOu
jwieringa@esri.com
@jwieringa
Arcgis Online & Ruby - Esri Developer Summit
By Jason Wieringa
Arcgis Online & Ruby - Esri Developer Summit
- 2,611