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Write a rails generator that can be used to generate a filter.

Write better documentation explaining both basic filtering features better and explaining how to implement advanced filtering features.

Not sure if I did not set it up correctly. But I failed to get the expected result set from self-referential association.

I have a Category model, which has many sub-categories:

class Category < ActiveRecord::Base
  belongs_to :parent_category, class_name: :Category
  has_many :child_categories, class_name: :Category, foreign_key: "parent_category_id"
end

Then in my filter class:

class CategoriesFilter < FilterMe::ActiveRecordFilter
  model Category
  association :parent_category, filter_class: CategoriesFilter

  field :name, [:eq]
end

Then when I do the filter with the following filter params:

{ filters: { parent_category: { name: { eq: "Category 1" } } } }

But this generates the following SQL query:

SELECT "categories".* FROM "categories"
    INNER JOIN "categories" "parent_categories_categories"
    ON "parent_categories_categories"."id" = "categories"."parent_category_id"
    WHERE "categories"."name" = 'Category 1'

Guess the WHERE clause should be "parent_categories_categories"."name" instead of "categories"."name".

Any idea?

Currently trying to use one of Arel's grouping predications for a filter fails. These Arel predications should be supported. http://rdoc.info/github/rails/arel/master/Arel/Predications