Support more advanced schemas, including foreign keys

[awreece]

Is this project dead? I see no updates in a few years and all the pull requests are stale. Should I bother fixing the tests in my PR and trying to integrate it?

Summary

I'm starting to use mosql to migrate from mongodb with mongoose schemas to postgres. This diff has a number of improvements that were necessary for my migration:

• Support for foreign keys on nested schemas
• ObjectId is now stored as bytea
• Support for array types
• Support for :default, :notnull, etc
• Better bulk insert support (and perf) via the the use of Sequel::Database##multi_insert

Examples

This corresponds to the following:

var ChildrenSchema = new mongoose.Schema({
    name: { type: String }
});

var TestSchema = new mongoose.Schema({
    name: { type: String },
    tags: [{ type: String }],
    balance: { type: Number },
    meta: { type: Object },
    children: [ ChildrenSchema ]
});

alphaflow:
    test:
        :columns:
        - id:
          :source: _id
          :type: bytea 
          :notnull: true
        - name:
          :source: name
          :type: text
        - tags:
          :source: tags
          :type: text array
        - balance:
          :source: balance
          :type: int
        - meta:
          :source: meta
          :type: jsonb
        :meta:
          :table: test 
          :schema: alphaflow
        :children:
          :meta:
            :table: test_children
            :schema: alphaflow
          :columns:
          - id:
            :source: _id
            :type: bytea not null
          - name:
            :source: name
            :type: text

Testing done

A bunch of manual testing, including on some rather complex schemas.

Note this diff is not safe to integrate, as it broke most of the unit tests

[nelhage-stripe]

Hey @awreece,

Unfortunately, Stripe hasn't used this project in some time and so it's been mostly unmaintained. If you happen to be interested in taking on ownership+maintenance, we'd potentially be willing to chat about that, but otherwise we probably won't be able to review this PR.

[awreece]

Thanks for the quick reply!

Good to know. We're not the right long term maintainers of this tool -- we view it as a way to migrate off of mongodb and so we'd abandon maintenance shortly as well.

Feel free to close the PR, but I'm also happy to just leave it open and visible in the main project -- maybe some future company will see it and want to pick up where we leave off.

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