NODES 2020

1. Hi

2. borealisdigitalstudio.com

3. Transforming a rest service to a graph
service

8. restcountries.eu/rest/v2/all

9. restcountries.eu/rest/v2/name/brazil

10. restcountries.eu/rest/v2/currency/usd

11. restcountries.eu/rest/v2/lang/fr

12. Restcountries API limitations

13. Restcountries API limitations
- Data traversal

14. Restcountries API limitations
- Data traversal
- Advanced searching

15. Restcountries API limitations
- Data traversal
- Advanced searching
- Over fetching

18. Rest service => Graph service

19. Data traversal

20. Data traversal
Node A

21. Data traversal
Node A
Node C
Node B

22. No over fetching

23. neo4j-graphql.js

24. N + 1 problem
- 40 authors
- Each author has an article
- 1 request to get all the authors
- 40 requests get the articles of each author
- 41 total database calls!

26. Data structure

27. Data structure
Country

28. Data structure
Country
Country
hasBorders

29. Data structure
Country
Country
hasBorders
Time-
zones

30. Data structure
Country
Country
hasBorders
Time-
zones
Region
blocs

31. Data structure
Country
Country
hasBorders
Time-
zones
Region
blocs
Curren-
cies

32. Data structure
Country
Country
hasBorders
Time-
zones
Region
blocs
Curren-
cies
Langu-
ages

33. Data structure
Country
Country
hasBorders
Time-
zones
Region
blocs
Curren-
cies
Langu-
ages
Subreg-
ions
Regions

34. Data structure
Country
Country
hasBorders
Time-
zones
Region
blocs
Curren-
cies
Langu-
ages
Subreg-
ions
Regions
Transla
-tion

35. Inserting data

36. Inserting data - schema first

37. Inserting data - admin import

38. Inserting data - load CSV

39. Inserting data - APOC load JSON

40. Inserting data - JS script

41. JS insert script - connecting to neo4j

42. JS insert script - fetching data

43. JS insert script - creating country node

44. JS insert script - bordering countries

45. JS insert script - reusable insert function

46. JS insert script - async/await

48. inferSchema from neo4j

49. Setup Apollo server

50. GraphQL API - filter

51. GraphQL API - sorting

52. GraphQL API - pagination

53. GraphQL API - data traversal

54. GraphQL API - data traversal

55. GraphQL API - data traversal

56. Custom cypher queries - Bordering countries

57. Custom cypher queries - Population density

58. Custom cypher queries - Distance to other countries

59. What are the subregions of Europe?

60. What currencies are used in African countries?

61. Give me all the countries with a population of 10 million or less, sorted by population

62. What is the full name of the bordering countries?

63. Give me all the countries on the UTC timezone?

65. github.com/lennertVanSever/graphcountries

67. Country with the most borders

68. Languages ordered by prevalence in countries

69. Most similar bordering countries

70. The graph diameter

71. The most central countries

72. Community of countries

73. Neovis

74. Cytoscape.js

75. Check my website on lennertvansever.dev