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ActiveRecord如何将哈希转换为JSONB？

[英]How does ActiveRecord convert a hash to JSONB?

原文 2018-09-05 19:33:30 5 1 ruby-on-rails/ ruby-on-rails-4/ rails-activerecord/ pg

I have a hash that contains only string keys and simple datatypes that are compatible with JSON (numeric values, arrays, string, and objects containing the same). 我有一个哈希，其中仅包含与JSON兼容的字符串键和简单数据类型（数字值，数组，字符串和包含它们的对象）。

I'd like to know what ActiveRecord (or any other layers involved) does to translate that ruby hash into the SQL statement that stores it in a JSONB column. 我想知道ActiveRecord（或涉及的其他任何层）如何将红宝石哈希值转换为将其存储在JSONB列中的SQL语句。

Using rails 4.2.7.1 , and pg 0.20.0 使用rails 4.2.7.1和pg 0.20.0

Does ActiveRecord just call #to_json on the hash, and the resulting String is put in the SQL query, and that's it? ActiveRecord是否仅在哈希上调用#to_json ，并将生成的String放入SQL查询中，仅此而已？

1 个解决方案

They called ActiveSupport::JSON.encode method, as you can see from lines . 他们调用了ActiveSupport::JSON.encode方法，正如您在lines中看到的那样。

But later it was changed in this commit , which caused problems mentioned in the bug ticket , and the notes . 但是后来在此提交中进行了更改，导致了错误单和注释中提到的问题。

如何将activerecord结果转换为哈希？ - How to convert activerecord result into a hash?

当将JSONB /哈希与数组一起使用时，ActiveRecord构造不正确的SQL - ActiveRecord constructs incorrect SQL when using JSONB/Hash with Array

ActiveRecord :: Relation转换为哈希缓慢 - ActiveRecord::Relation convert to hash slow

SQL 语句将 jsonb hash 转换为 json 字符串 - SQL statement to convert jsonb hash to json string

如何将两个ActiveRecord查询合并为一个哈希并转换为JSON？ - How to merge two ActiveRecord queries into one hash and convert to JSON?

如何从Rails控制台中的ActiveRecord类访问此哈希？ - How does one access this hash from an ActiveRecord class in the Rails console?

将ActiveRecord关系转换为特定键控哈希 - Convert an ActiveRecord relation to a specifically keyed Hash

ActiveRecord的方法不暗示数据库或转换为哈希/数组 - Methods for ActiveRecord that not implies database or convert into Hash/Array

Ruby：将数组或散列转换为activerecord关系 - Ruby: Convert an array or hash to an activerecord relation

如何将哈希或json字符串保存到jsonb字段中 - How to save a hash or json string into a jsonb field

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相关问题 如何将activerecord结果转换为哈希？ - How to convert activerecord result into a hash? 当将JSONB /哈希与数组一起使用时，ActiveRecord构造不正确的SQL - ActiveRecord constructs incorrect SQL when using JSONB/Hash with Array ActiveRecord :: Relation转换为哈希缓慢 - ActiveRecord::Relation convert to hash slow SQL 语句将 jsonb hash 转换为 json 字符串 - SQL statement to convert jsonb hash to json string 如何将两个ActiveRecord查询合并为一个哈希并转换为JSON？ - How to merge two ActiveRecord queries into one hash and convert to JSON? 如何从Rails控制台中的ActiveRecord类访问此哈希？ - How does one access this hash from an ActiveRecord class in the Rails console? 将ActiveRecord关系转换为特定键控哈希 - Convert an ActiveRecord relation to a specifically keyed Hash ActiveRecord的方法不暗示数据库或转换为哈希/数组 - Methods for ActiveRecord that not implies database or convert into Hash/Array Ruby：将数组或散列转换为activerecord关系 - Ruby: Convert an array or hash to an activerecord relation 如何将哈希或json字符串保存到jsonb字段中 - How to save a hash or json string into a jsonb field

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