ActiveRecord或查询哈希符号

问题描述

我知道有3种主要的符号用于为 ActiveRecord方法：

I know there are 3 main notations for supplying arguments to the where ActiveRecord method:

1. 纯字符串


2. Array


3. 哈希

指定和表示其中方法很简单：

# Pure String notation
Person.where("name = 'Neil' AND age = 27")

# Array notation
Person.where(["name = ? AND age = ?", 'Neil', 27])

# Hash notation
Person.where({name: "Neil", age: 27})

为此指定或，其中方法让我很讨厌哈希语法。

Specifying or for this same where method is stumping me for the hash syntax. Is it possible?

# Pure String notation
Person.where("name = 'Neil' OR age = 27")

# Array notation
Person.where(["name = ? OR age = ?", 'Neil', 27])

# Hash notation DOESN'T WORK
Person.where({name: "Neil" OR age: 27})

推荐答案

可以将5个选项视为哈希表示法的实现（后两个选项有点像hash- ish ）：

There are 5 options that could be considered as implementations of «Hash notation» (the last two are kinda hash-ish):

1. 使用Ruby on Rails 5，您可以使用方法：

Person.where(name: 'Neil').or(Person.where(age: 27))

使用以及。 才能确保 default_scope 不包含在 where_values 中。否则来自 default_scope 和的谓词，其中将与或运算符：

Use where_values together with reduce. The unscoped method is necessary only for Rails 4.1+ to ensure default_scope is not included in the where_values. Otherwise predicates from both default_scope and where would be chained with the or operator:

Person.where(
  Person.unscoped.where(name: ['Neil'], age: [27]).where_values.reduce(:or)
)

安装实现这些或类似功能的第三方插件，例如：

Install third-party plugins that implement these or similar features, for example:

• （Ruby on Rails 5的backport .or

Person.where{(name == 'Neil') | (age == 27)}

Person.where(name: 'Neil').or(age: 27)

Person.where.anyof(name: 'Neil', age: 27)

Person.where(
  (SmartTuple.new(' or ') << {name: 'Neil', age: 27}).compile
)

使用：

Person.where(
  Person.arel_table[:name].eq('Neil').or(
    Person.arel_table[:age].eq(27)
  )
)

使用带名称par的准备好的语句ameters：

Use prepared statements with named parameters:

Person.where('name = :name or age = :age', name: 'Neil', age: 27)

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