Rails 5连接关联的过滤器
Rails 5 joins filter associated

Question

如何使用联接查询Rails 5中的关联模型？ 在查看文档和这个问题之后，我尝试过的是DoctorLocation.joins(:location).where(:location => {:confidence => 2}) 。 我究竟做错了什么？ 我的查询未返回任何结果。

pry(main)> DoctorLocation.joins(:locations).where(:locations => {:confidence => 2})
=> #<DoctorLocation::ActiveRecord_Relation:0x3ff735a09d8c>

class DoctorLocation
   belongs_to :location

end

class Location
   has_many :doctor_locations, dependent: :destroy

end

移民

   create_table :doctor_locations do |t|
      t.integer :doctor_profile_id
      t.integer :location_id
      t.text :uuid
      t.timestamps null: false
    end


 create_table :locations do |t|
      t.string   :address
      t.integer  :ordinal, :default => 1
      t.integer  :doctor_profile_id
      t.text     :uuid
      t.timestamps
    end

 add_column :locations, :confidence, :integer

Answer 1

您实际上有正确的查询。 而是您的测试方法已损坏。

class DoctorLocation < ApplicationRecord
  belongs_to :location
  def self.with_confidence(c)
    DoctorLocation.joins(:location).where(locations: { confidence: c })
  end
end

通过的规范确认它可以按预期工作：

require 'rails_helper'

RSpec.describe DoctorLocation, type: :model do

  after(:each) { DoctorLocation.destroy_all }
  it "includes locations with the correct confidence" do
    dl = DoctorLocation.create!(location: Location.create!(confidence: 2))
    DoctorLocation.create!(location: Location.create!(confidence: 1))
    expect(DoctorLocation.with_confidence(2)).to include dl
    expect(DoctorLocation.with_confidence(2).count).to eq 1
  end
  it "does not include rows without a match in the join table" do
    dl = DoctorLocation.create!(location: Location.create!(confidence: 1))
    expect(DoctorLocation.with_confidence(2)).to_not include dl
  end
end

Answer 2

在joins及其where （散列参数）中，您需要声明关联名称（ location ），而不是表名称（ locations ）：

DoctorLocation.joins(:location).where(location: { confidence: 2 })

这通常是造成混乱的原因。

Rails 5连接关联的过滤器
Rails 5 joins filter associated

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Rails 5连接关联的过滤器 Rails 5 joins filter associated

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Rails 5连接关联的过滤器
Rails 5 joins filter associated

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