articles-event-sourcing.txt

articles: [
    {id: 1, created_at: "..."},
    {id: 2, created_at: "..."}
],

articles_events: [
    {id: 1, article_id: 1, type: "created", data: {title: "hello", category_id: 3}, created_at: "..."},
    {id: 2, article_id: 1, type: "title_updated", data: {title: "hello, world"}, created_at: "..."},
    {id: 3, article_id: 1, type: "published", data: {}, created_at: "..."},
    
    {id: 4, article_id: 2, type: "created", data: {title: "foo bar", category_id: 1}, created_at: "..."},
    {id: 5, article_id: 2, type: "category_updated", data: {category: 2}, created_at: "..."},
    {id: 6, article_id: 2, type: "published", data: {}, created_at: "..."},
    {id: 7, article_id: 2, type: "title_updated", data: {title: "fizz buzz"}, created_at: "..."},
    {id: 8, article_id: 2, type: "published", data: {}, created_at: "..."},

    {id: 9, article_id: 1, type: "drafted", data: {}, created_at: "..."},
]

~> state after event id #1:

articles_draft: [
    {id: "...", article_id: 1, title: "hello", category_id: 3},
],
articles_published: []

~> state after event id #2:

articles_draft: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3},
],
articles_published: []

~> state after event id #3:

articles_draft: [],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3}
]

~> state after event id #4:

articles_draft: [
    {id: "...", article_id: 2, title: "foo bar", category_id: 1}
],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3}
]

~> state after event id #5:

articles_draft: [
    {id: "...", article_id: 2, title: "foo bar", category_id: 2}
],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3}
]

~> state after event id #6:

articles_draft: [],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3},
    {id: "...", article_id: 2, title: "foo bar", category_id: 2}
]

~> state after event id #7:

articles_draft: [
    {id: "...", article_id: 2, title: "fizz buzz", category_id: 2}
],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3},
    {id: "...", article_id: 2, title: "foo bar", category_id: 2}
]

~> state after event id #8:

articles_draft: [],
articles_published: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3},
    {id: "...", article_id: 2, title: "fizz buzz", category_id: 2}
]

~> state after event id #9:

articles_draft: [
    {id: "...", article_id: 1, title: "hello, world", category_id: 3},
],
articles_published: [
    {id: "...", article_id: 2, title: "fizz buzz", category_id: 2}
]