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PORails 3: Many to many relationship with polymorphic association
 

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  1. PORails 3: Many to many relationship with polymorphic association
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    <p>I have 2 models e.g task model and task_relation model Task has many parent tasks and child tasks.</p> <p>Have added following associations -</p> <p><strong>Task.rb</strong></p> <pre><code> has_many :from_tasks, :as =&gt; :relation, :class_name =&gt; "TaskRelation", :foreign_key =&gt; "task_from_id", :source =&gt; :parent, :conditions =&gt; {:relation_type =&gt; 'Parent'}, :dependent =&gt; :destroy has_many :to_tasks , :as =&gt; :relation, :class_name =&gt; "TaskRelation", :foreign_key =&gt; "task_to_id", :source =&gt; :child, :conditions =&gt; {:relation_type =&gt; 'Child'}, :dependent =&gt; :destroy has_many :child_tasks, :through =&gt; :from_tasks, :dependent =&gt; :destroy has_many :parent_tasks, :through =&gt; :to_tasks, :dependent =&gt; :destroy accepts_nested_attributes_for :to_tasks, :reject_if =&gt; :all_blank, :allow_destroy =&gt; true accepts_nested_attributes_for :from_tasks, :reject_if =&gt; :all_blank, :allow_destroy =&gt; true </code></pre> <p><strong>TaskRelation.rb</strong></p> <pre><code> belongs_to :parent_task, :class_name =&gt; "Task", :foreign_key =&gt; "task_from_id" belongs_to :child_task, :class_name =&gt; "Task", :foreign_key =&gt; "task_to_id" belongs_to :relation, :polymorphic =&gt; true </code></pre> <p>When I save task form, it also saves parent_tasks and child tasks in task_relations table with relation_type as 'Task' but I want to store relation_type as 'Parent' for parent tasks and 'Child' for child tasks.</p> <p>Can anyone please help me on this.</p>
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    1. USVadim Chumel
    1. USSailee Reddy
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      1. PORails 3: Many to many relationship with polymorphic association
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    1. COThis model looks needlessly complex - can you clarify (in words, not code) precisely what a task needs to be associated with?
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      1. USPinnyM
    2. COWant to associate task model with task as parent task and child task. Need to store this association in task_relation model as which task is parent task and which is child task.
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      1. PORails 3: Many to many relationship with polymorphic association
      1. USSailee Reddy
    3. COAre there expected to be more than one parent and child per task?
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      1. PORails 3: Many to many relationship with polymorphic association
      1. USPinnyM
 

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