Question

我有两个模型，Clinician和Patient。 clinician has_many: patients和patient belongs_to :clinician。

除了临床医生，患者belongs_to患者还有一个名为shared_with的列，该列是一个包含clinician.id数组的字符串。这是使用serialize :shared_with, Array完成的。

我希望能够从临床医生的full_name下拉菜单中选择仅id数组中包含shared_with {{}}}的临床医生。

<%= form_for [@clinician, @comment] do |form| %>

<div class="form-group">
  <%= form.label :clinician_id %>
  <%= form.collection_select :clinician_id, Clinician.all.order("last_name asc"), :id, :full_name, class: "form-control" %>
</div>

<div class="form-group">
  <%= form.label :general_comment %>
  <%= form.text_area :general_comment, class: "form-control", rows: 5, placeholder: "Leave a comment" %>
</div>

<%= form.button 'Submit Comment', class: "btn btn-u btn-success" %>

我目前在哪里Clinician.all.order("last_name asc")我想对它进行排序，以便我只有这个较短的列表。

我认为用@clinicians取代我现在所拥有的并将其定义为：

@patient = Patient.find_by(user_id: current_user.patient.id).shared_with
@clinicians = a list of clinicians where id: @patient.each

并使用一些能够为我做到这一点的方法。

任何建议都将不胜感激。感谢

Answer 1

which is a string holding an array of clinician.id

This terrible! Do not store the ids this way. You are trying to solve the wrong problem with your question.

Your array of shared_with ids should be a many to many relationship in the database with it's own table (Rails calls this has_and_belongs_to_many). A patient can be shared with many clinicians and a clinician may share many patients. Read the Rails guide on many to many relationships before going further: http://guides.rubyonrails.org/association_basics.html#has-and-belongs-to-many-association-reference

You should end up being able to call @patient.shared_clinicians or similar to get a list of the clinicians for the dropdown.

Your models would look something like this:

class Patient < ActiveRecord::Base
  belongs_to :clinician
  has_and_belongs_to_many :shared_clinicians, join_table: 'shared_patients'
end

class Clinician < ActiveRecord::Base
  has_many :patients
  has_and_belongs_to_many :shared_patients, join_table: 'shared_patients'
end

Then a database table shared_patients with two columns: clinician_id and patient_id

从数组值rails

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