[英]Using named scopes in Ruby on Rails 4 on associated models
我的應用程序包含3個模型:
FashionModel
Measurement
ModelProfile
class FashionModel < ActiveRecord::Base
has_secure_password
has_one :model_profile
has_one :measurement
accepts_nested_attributes_for :model_profile
accepts_nested_attributes_for :measurement
end
class ModelProfile < ActiveRecord::Base
belongs_to :fashion_model
end
class Measurement < ActiveRecord::Base
belongs_to :fashion_model
end
該模式大致如下:
create_table "fashion_models", force: :cascade do |t|
t.string "first_name", limit: 25
t.string "last_name", limit: 25
t.string "email", limit: 255, null: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest", limit: 255
t.string "password_reset_token", limit: 255
t.datetime "password_reset_sent_at"
end
create_table "measurements", force: :cascade do |t|
t.integer "fashion_model_id", limit: 4
t.decimal "feet", precision: 10
t.decimal "inches", precision: 10
t.decimal "bust", precision: 10, default: 36
t.decimal "waist", precision: 10, default: 28
t.decimal "hips", precision: 10, default: 36
t.decimal "shoes", precision: 10
t.integer "dress", limit: 4
t.string "eyes", limit: 255
t.string "hair", limit: 255
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "model_profiles", force: :cascade do |t|
t.integer "fashion_model_id", limit: 4
t.string "phone_number", limit: 255
t.date "birthdate"
t.text "bio", limit: 65535
t.string "location", limit: 255, default: "Venice"
t.string "gender", limit: 255
t.decimal "rate", precision: 10, default: 100
t.string "profile_picture", limit: 255
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "model_profiles", ["fashion_model_id"], name: "index_model_profiles_on_fashion_model_id", using: :btree
add_foreign_key "bookings", "fashion_models"
add_foreign_key "fashion_model_photos", "fashion_models"
end
我正在嘗試根據輸入過濾掉數據。 例如,有人搜索身高5'8“,黑眼睛,棕色頭發的模型,我應該通過查詢數據庫僅顯示那些模型。
因此,我試圖在模型中使用命名作用域。 我不確定如何通過在FashionModel
模型中編寫作用域來限制measurement
表的屬性。
我在線閱讀了一些資源,據我了解,我寫了類似
scope :eye_color, includes(:measurement).where(measurement: { eyes: "Amber" })
盡管我不想將Amber
硬編碼到eyes字段中,但是在嘗試訪問該作用域時,控制台中出現錯誤。 我做類似的事情
a = FashionModel.all
a.eye_color
這給了我一個and ArgumentError: wrong number of arguments (given 0, expected 1)
。
我也嘗試這樣做
scope :eye_color, -> (eye_color) { where eyes: eye_color }
然后通過a.eye_color("Amber")
調用它,這又給了我NoMethodError: undefined method 'measurement' for Class
。
因此,基本上我想將范圍從父模型擴展到子模型。 任何幫助深表感謝! 謝謝
將范圍定義為:
scope :eye_color, ->(eye_color) {
includes(:measurements).where(measurements: {eyes: eye_color})
}
然后使用以下參數進行查詢:
FashionModel.eye_color("Amber")
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