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我有一個用戶和一個角色模型,兩者都通過habtm關聯,並且有一個與角色關聯的論壇模型。在針對論壇的搜索表單中,我希望由具有特定角色的用戶(按名稱:主持人)進行過濾。如何在ransack上設置字段名的默認條件?
來源是這樣的:
class User < ActiveRecord::Base
has_and_belongs_to_many :roles, :join_table => :users_roles
rolify
class Role < ActiveRecord::Base
has_and_belongs_to_many :users, :join_table => :users_roles
belongs_to :resource, :polymorphic => true
class Forum < ActiveRecord::Base
has_many :roles, :as => :resource
...
<%= simple_form_for @forums, :html => { :class => 'form-horizontal' } do |f| %>
...
<%= f.input :roles_users_id_in,
:collection => User.joins(:roles)
.where(:roles => {:name => :moderator}) %>
是否有可能這個組合成字段名,我需要設置一些與定製preciated或我怎麼能預設條件搜索(role.name = =:主持人)?
更新
它seesm像我必須使用自定義的ransacker,我想出了以下內容:
class Forum < ActiveRecord::Base
..
ransacker :moderator_users, :formatter => proc { |v|
Role.joins(:users).where(:roles => { :name => :moderator,
:resource_type => :forum},
:users => {:id => v}).map(&:resource_id)
} do |parent|
parent.table[:id]
end
<%= search_form_for @q, :builder => SimpleForm::FormBuilder do |f| %>
<%= f.input :moderator_users_in,
:collection => User.joins(:roles)
.where(:roles => {:name => :moderator}),
...
有了解決方法上面有一個論壇的SQL查詢和查詢每個用戶。
SELECT DISTINCT `forums`.* FROM `forums`
LEFT OUTER JOIN `roles` ON `roles`.`resource_id` = `forums`.`id` AND
`roles`.`resource_type` = 'Forum'
LEFT OUTER JOIN `users_roles` ON `users_roles`.`role_id` = `roles`.`id`
LEFT OUTER JOIN `users` ON `users`.`id` = `users_roles`.`user_id`
WHERE `roles`.`name` = 'responsible' AND `users`.`id` IN (1,3,6)
參見::是否可以這樣像這樣結合起來,並設置SQL查詢的東西https://github.com/ernie/ransack/issues/103