Rails 在jsonb多个where条件下查找子串

Question

假设我的 table recipes 列类型为 ingredients、jsonb。示例记录：

{
  id: 1,
  ingredients: [
    'eggs',
    'fragrant bread',
    'fresh tomatoes'
  ]
}

如何在where条件下检索带子字符串的记录？例如：

ingredients = ['egg', 'tomato']
Recipe.where('ingredients ?& array[:keys]', keys: ingredients)

我正在尝试：

ingredients = ['egg', 'tomato']
Recipe.where("ingredients @> ARRAY[?]::varchar[]", ingredients).count

但是我收到这个错误：

ERROR:  operator does not exist: jsonb @> character varying[] (PG::UndefinedFunction)

Answer 1

我真的会考虑只使用两个表来代替，因为这让人讨厌 JSON 反模式。

class Recipe
  has_many :recipe_ingredients
  has_many :recipes, through: :recipe_ingredients

  def self.with_ingredients(*ingredients)
    binds = Array.new(ingredients.length, '?')
    sql = "ingredients.name ILIKE ANY(ARRAY[#{binds.join(,)}])"
    joins(:ingredients)
      .where(
        sql,
        *ingredients.map { |i| "'%#{i}%'" }
      )
  end
end

class RecipeIngredient
  belongs_to :ingredient
  belongs_to :recipe
end

class Ingredient
  has_many :recipe_ingredients
  has_many :recipes: through: :recipe_ingredients
end

这让您可以在 recipies.name 上使用有效的索引，合理的查询并避免非规范化。

Rails 在jsonb多个where条件下查找子串

Rails find substring in jsonb multiple where conditions

sql

ruby-on-rails

activerecord

jsonb