In ActiveAdmin, if your resource model is deriving some data from other models, using some kind of relationship(has_one or has_many).
In this scenarios where you want to search and filter the resource based on the data in its related table, you can follow below:
Suppose you have a model School, and a model Student, now you want to search or filter students based on the school name.
We can filter using join(:schools).where("schools.name like") or say an In Query which is inefficient.
Either way ActiveAdmin does not provide default filters based on your associations.
or taking the complex route here: https://github.com/gregbell/active_admin/issues/45
We can achieve this by a simple approach:
When you write filter :first_name, if first\_name is a string, activeadmin looks for a method first\_name\_contains inside the resource model. The method first\_name\_contains is provided using meta\_search gem.
This is how filters work in AA, using the meta\_search gem. Now if we can define an equivalent method for search in model, we can achieve what we need.
Define filter :name_of_filter, and specify as string, so filter name would name_of_filter_contains.
Now define this as a class method inside your model or as a scope, your query to fetch records.
Now your custom search work as a normal filter in AA.
filter :last_name, :as => :string, :label => 'Last Name'
def self.last_name_contains end
Other important AA links:
For Filter: https://gist.github.com/rdj/1057991
For Adding Autocomplete for fields: https://gist.github.com/bbonamin/1258276
For Adding tokeninput to ActiveAdmin: https://gist.github.com/abhijitsinha/8b6871cfda555d305be8
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