ROM.rb: Another Approach to Persistence

Meguro.rb #7

1. ROM.rb: Another Approach to Persistence Seiya IZUMI (@sy_izumi)
2. About me • ෢ଂେֶ4೥ • 1೥ؒٳֶͯ͠ITاۀͰΊͪΌͪ͘ΌΠϯλʔ ϯͨ͠Γͨ͠ • ීஈ͸Vue.js΍ReactNativeͳͲΛ৮ͬͯ·͢ @sy_izumi IzumiSy
3. ࠓ೔͸ROM.rbͷ͸ͳ͠Λ͠·͢
4. RailsΞϓϦέʔγϣϯΛ࡞͍ͬͯͯ • Model͕σʔλϕʔεʹର͢Δૢ࡞ͱɺυϝΠ ϯର͢Δૢ࡞ͱ͍͏̎ͭͷ੹຿Λ͕࣋ͪͪʹ ͳΔ͜ͱ͕ଟ͍ • Ϟσϧ͕࣮࣭ɺӬଓԽϨΠϠͱૄ݁߹
 database schema ≒ domain model
5. ActiveRecordͷ͍ͤͰ͸ͳ͍ • ActiveRecordύλʔϯʹ͓͍ͯ͸ɺϞσϧ͕ ӬଓԽϨΠϠͷߏ଄ͱಉ͡Ͱ͋Δͱ͍͏͜ͱ ͸ར఺ɻ • ϦϑΝΫλϦϯάύλʔϯͳͲʹΑͬͯద੾ͳ ରॲ͕Ͱ͖Δ
 (FormObject, Validator, Callback,etc …)
6. ʮAR͡Όͳ͍ͱμϝʯͰ͸ͳ͍ • ϦϑΝΫλϦϯάύλʔϯΛۦ࢖ͯ͠ ActiveRecordΛ࢖͍͜ͳ͢ͷ΋ͻͱͭͷબ୒ • Ͱ΋ɺ΋͔ͨ͠͠Β୅ସʹͳΔΑ͏ͳҟͳΔ ࢥ૝ͷORϚούʔ͕͋Δ͔΋ʂ • άάͬͯΈΔ
7. ͋ͬͨ
8. ROM.rbͱ͸ • RubyΞϓϦέʔγϣϯͷͨΊͷӬଓԽϥΠϒ ϥϦ • ୯ͳΔORϚούʔͰ͸ͳ͘ɺ༷ʑͳӬଓԽ૷ ஔΛϓϥΨϒϧͳΞμϓλͱͯ͠࢖͑Δ • Separating persistence from domain layer
9. ϔΩαΰφϧɾΞʔΩςΫνϟ http://blog.tai2.net/hexagonal_architexture.html
10. ӬଓԽΛͲ͏ଊ͑Δ͔ʁ User.create(name: “Bob”) POST https://api.stripe.com/v1/charges
11. ӬଓԽϨΠϠͱૄ݁߹ੑ • ΞϓϦέʔγϣϯͷ֎෦ʹ͋Δ૷ஔͷૢ࡞ํ ๏ʹؔͯ͠Ͱ͖Δ͚ͩૄ݁߹ʹ͢Δ • WebAPI͸͍ͭ·Ͱ΋࢖͑Δͱ͸ݶΒͳ͍
 ʢcf. WebPayͷαʔϏεऴྃ in 2016ʣ • ΞϓϦέʔγϣϯ͕ϏδωεҎ֎ͷ΋ͷʹґ ଘ͠ॊೈੑ͕ࣦΘΕΔͷΛආ͚Δ
12. How to use ROM.rb?
13. Architecture .PEFM 3FQPTJUPSZ 3FMBUJPO "EBQUFS Infratructure Layer Domain Layer
14. Architecture 1030 ROM::Repository ROM::Relation ROM::Gateway Infratructure Layer Domain Layer
15. Model module Domain class Book attr_reader :id, :title, :price def initialize(attrs) @id, @title, @price = attrs.values_at(:id, :title, :price) end end end • POROͳΞϓϦέʔγϣϯݻ༗ͷϩδοΫΛ࣋ͭ੹຿ • ଟ͘ͷ৔߹RepositoryʹΑͬͯੜ੒͞ΕΔ • ROM.rb͕͜͜ʹ༩͑ΔӨڹ͸࠷খݶ
16. Repository module Repository class Book < ROM::Repository[:books] def by_id(id) books.by_pk(id).map_to(Domain::Books).one! end def all books.map_to(Domain::Book) end end end • υϝΠϯϨΠϠͱӬଓԽϨΠϠͷ૭ޱʹͳΔ෦෼ • υϝΠϯʹద੾ͳΦϒδΣΫτΛੜ੒͠ɺӬଓԽ૷ஔʹݻ༗ͳΫΤϦੜ ੒ͳͲ͸Relation͕੹຿ͱͯ͠੥͚ෛ͏
17. Relation class Books < ROM::Relation[:sql] schema(infer: true) do associations do belongs_to :author end def by_id(id) where(id: id) end def available where(is_available: true) end end end • ӬଓԽϨΠϠͱͯ͠Ξμϓλʹ ର͢Δૢ࡞Λϥοϓ͢Δ • ΞιγΤʔγϣϯ΍ϑΟʔϧυ όϦσʔγϣϯͳͲΛ͜͜Ͱఆ ٛ • ର৅ͱͳΔΞμϓλʹݻ༗ͷૢ ࡞͕Ͱ͖Δ • ͜͜Ͱఆٛͨ͠ϝιου܈Λ RepositoryͰ࢖͑Δ
18. Adapter • ӬଓԽ૷ஔͷ۩ମతͳૢ࡞Λߦ͏੹຿ • 3rd-partyͷओཁͳAPIΞμϓλ͸͍͔ͭ͘༻ҙ͞Ε͍ͯΔ • SQLΞμϓλʹ͸Sequel͕ϥοϓ͞Ε͍ͯΔ
19. ·ͱΊ
20. ·ͱΊ • ROM.rb͸ӬଓԽϨΠϠͷந৅ԽͱυϝΠϯϨ ΠϠ͔Βͷ෼཭ΛΨονϦͱαϙʔτͯ͘͠ ΕΔ • υϝΠϯʢϞσϧʣϨΠϠͱӬଓԽϨΠϠΛ ૄ݁߹ʹͯ͠ɺΞϓϦέʔγϣϯΛมԽʹڧ ͘͠Α͏
21. Ұํ·ͨผͷҙݟ • Ͳͷ੹຿ΛͲ͏෼͚Δ͔ͱ͍͏؍఺ͷ౷Ұ͕ ग़དྷ͍ͯͳ͍ͱӡ༻ͣ͠Β͍ݒ೦͕͋Δ • ιʔείʔυ͕ࢄΒ͹ͬͯݟ௨͕͠ѱ͘ͳΔͱ ͍͏ਓ΋͍Δ • ΞϓϦέʔγϣϯͷ૝ఆن໛ʹ߹Θͤͯద੾ ͳπʔϧΛબͿͷ͕BEST
22. https://github.com/IzumiSy/sample_bookshelf
23. Thank You! http://rom-rb.org