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這可能是一個基本的問題,但它目前讓我瘋狂......也許我失去了一些東西,因爲我在代碼中跳得太深,但問題是:與協會創建新的紅寶石模型實例
如何使我的對象與關聯?
我有以下遷移腳本:
class CreateConcepts < ActiveRecord::Migration
def self.up
create_table :concepts do |t|
t.integer :language_id, :null => false
t.string :uri
t.integer :isco_code
t.timestamps
end
end
def self.down
drop_table :concepts
end
end
class CreatePrefLabels < ActiveRecord::Migration
def self.up
create_table :pref_labels do |t|
t.integer :language_id
t.integer :concept_id
t.string :value
t.timestamps
end
end
def self.down
drop_table :pref_labels
end
end
class CreateLanguages < ActiveRecord::Migration
def self.up
create_table :languages do |t|
t.string :code
t.timestamps
end
end
def self.down
drop_table :languages
end
end
這些對象的類如下所示:
class Concept < ActiveRecord::Base
belongs_to :language
has_one :pref_label
validates_uniqueness_of :isco_code
end
class PrefLabel < ActiveRecord::Base
belongs_to :language
belongs_to :concept
validates_uniqueness_of :value
end
class Language < ActiveRecord::Base
has_many :concepts
has_many :pref_labels
validates_uniqueness_of :code
end
所以,如果我沒有記錯我的紅寶石的經驗教訓,下面的代碼應該是完美的罰款:
concept = Concept.first
concept.pref_label
language = Language.find(:code => "en")
language.pref_labels
language.concepts
所以我寫了下面的代碼行。內部有點暗,但我100%肯定從JSON數據生成的哈希是正確的。與調試器選中此:
# This function will retrieve all the top most concepts from the ESCO API in the
# specified language as an array of Ruby objects, each represented by the relevant class.
# If the relevant concept does not exist in the database, the entry is automatically created.
# The function will fall back to English by default if no language is specified
def self.top_concepts(lang = Language.find_by_code('en') || Language.create(:code => 'en'))
concepts = []
json = HTTParty.get "#{Setting[:api]}/getTopmostConcepts?language=#{lang.code}"
collection = JSON.parse json.parsed_response
collection.each do |c|
language = Language.find_by_code c['language'] || Language.create(:code => c['language'])
concept = Concept.create(:language => language, :uri => c['uri']['uri'], :isco_code => c['iscoCode'].to_i)
label = PrefLabel.find_by_concept_id(concept.id) || PrefLabel.create(:language_id => language.id, :concept_id => concept.id, :value => c['prefLabel']['string'])
concept.pref_label= label
concept.save
concepts << concept
end
return concepts
end
我現在遇到的問題是,我的PrefLabels是: 1)不beeing創造了所有的時間 2)永遠不會鏈接到我的概念的對象。
我錯過了什麼?
你是對的,範圍缺失 – 2011-05-04 14:31:55