本文介绍了ActiveRecord中的PostgreSQL jsonb字段belongs_to关联的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我可以在belongs_to 关联中使用jsonb 字段作为foreign_key 吗?类似的东西:
Can I use a jsonb field as a foreign_key in a belongs_to association? Something along the lines of:
belongs_to :product, class_name: "Product", foreign_key: "data ->'product_id'"
推荐答案
引用只能在列(或列组)之间定义，正如 文档:
References can be defined only between columns (or groups of columns), as it is stated in the documentation:
FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn[, ... ] ) ]
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