變更爲許多一對多的關係

與José's upserts post沿繼我有很多一對多的兩個模式之間的關係 - 技術和人才招聘，像這樣：變更爲許多一對多的關係

defmodule JobJawn.Listing.Job do 
    @moduledoc """ 
    A job is a position for which a JobJawn user might want to apply. This is the 
    central model for the system - meaning it's the reason a user might want to 
    visit the system. 
    """ 

    use Ecto.Schema 

    alias JobJawn.Directory.Company 
    alias JobJawn.Listing.{ 
      Discipline, 
      EmploymentType, 
      RoleType, 
      Technology, 
      Title} 

    schema "listing_jobs" do 
    field :date_missing, :naive_datetime 
    field :name, :string 
    field :url, :string 

    belongs_to :company, Company 
    belongs_to :discipline, Discipline 
    belongs_to :employment_type, EmploymentType 
    belongs_to :role_type, RoleType 
    belongs_to :title, Title 

    many_to_many :technologies, 
       Technology, 
       join_through: "listing_jobs_technologies" 

    timestamps() 
    end 
end 


defmodule JobJawn.Listing.Technology do 
    @moduledoc """ 
    Technology serves as a tag to help JobJawn users interested in a certain 
    technlogy (Elixir, Erlang, Python, C#, F#, etc) locate relevant positions 
    """ 

    use Ecto.Schema 

    schema "listing_technologies" do 
    field :name, :string 
    field :job_count, :integer, virtual: true 

    many_to_many :jobs, JobJawn.Listing.Job, join_through: "listing_jobs_technologies" 

    timestamps() 
    end 
end

我把創建變更時得到驗證錯誤找工作...

tech = JobJawn.Listing.Technology |> limit(1) |> JobJawn.Repo.one 
JobJawn.Listing.Job 
|> limit(1) 
|> preload(:technologies) 
|> JobJawn.Repo.one 
|> change 
|> put_assoc(:technologies, with: [tech])

會遞給我一個無效的變更：

#Ecto.Changeset<action: nil, changes: %{}, 
errors: [technologies: {"is invalid", [type: {:array, :map}]}], 
data: #JobJawn.Listing.Job<>, valid?: false>

我不知道爲什麼。

這是回購公衆是否有幫助：https://github.com/mcelaney/job_jawn/commit/f408505d165ae71947858676922cf067fe1cc413

來源

2017-06-21 Mac

我想調用'put_assoc'應該是：' |> put_assoc（技術，[技術]）' –

呃 - 我是個白癡...... – Mac

put_assoc有一個不同於cast_assoc的語法 - 你可以改爲一個答案，所以我可以接受它嗎？ – Mac

構建變更要經過的[tech]名單，作爲最後一個參數put_assoc

tech = JobJawn.Listing.Technology |> limit(1) |> JobJawn.Repo.one 

JobJawn.Listing.Job 
|> limit(1) 
|> preload(:technologies) 
|> JobJawn.Repo.one 
|> change 
|> put_assoc(:technologies, [tech]) # <-- with: keyword removed

來源

2017-06-22 05:40:52

變更爲許多一對多的關係

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