是否有 Rails 列類型的文檔？ - Is there documentation for the Rails column types?

問題：

I'm looking for more than the simple type listing that is found on this page :我正在尋找的不僅僅是此頁面上的簡單類型列表：

:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean :primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean

But is there any documentation that actually defines these fields?但是是否有任何文檔實際定義了這些字段？

Specifically:具體來說：

• What's the difference between :string and :text ? :string和:text什麼區別？
• Between :float and :decimal ?在:float和:decimal ？
• What are the distinguishing features of :time , :timestamp , and :datetime ? :time , :timestamp和:datetime的顯着特徵是什麼？

Are the nuances of these types documented anywhere?這些類型的細微差別是否記錄在任何地方？

EDIT: Points of DB-platform implementations are irrelevant to the question I'm trying to ask.編輯： DB 平臺實現的要點與我要問的問題無關。 If, say, :datetime does not have a defined intended meaning in Rails documentation, then what do db-adapter-writers go by when choosing a corresponding column type?例如，如果:datetime在 Rails 文檔中沒有定義的預期含義，那麼 db-adapter-writers 在選擇相應的列類型時會怎麼做？

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解決方案：

參考一： https://en.stackoom.com/question/nssq
參考二： https://stackoom.com/question/nssq