How to combine multiple resources into one feed? - ruby-on-rails

Question

How can we combine all these resources into one feed, with the most recent submission showing at the top?
user.rb
# Returns status feed.
def feed
following_ids = "SELECT followed_id FROM relationships
WHERE follower_id = :user_id"
Habit.where("user_id IN (#{following_ids})
OR user_id = :user_id", user_id: id)
Valuation.where("user_id IN (#{following_ids})
OR user_id = :user_id", user_id: id)
Goal.where("user_id IN (#{following_ids})
OR user_id = :user_id", user_id: id)
Quantified.where("user_id IN (#{following_ids})
OR user_id = :user_id", user_id: id)
end
schema.rb
ActiveRecord::Schema.define(version: 20150311202504) do
create_table "authentications", force: true do |t|
t.integer "user_id"
t.string "provider"
t.string "uid"
t.string "index"
t.string "create"
t.string "destroy"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "days", force: true do |t|
t.integer "level_id"
t.integer "habit_id"
t.boolean "missed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "goals", force: true do |t|
t.string "name"
t.date "deadline"
t.boolean "accomplished"
t.text "comment"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "goals", ["user_id", "created_at"], name: "index_goals_on_user_id_and_created_at"
add_index "goals", ["user_id"], name: "index_goals_on_user_id"
create_table "habits", force: true do |t|
t.datetime "left"
t.integer "level"
t.text "committed"
t.datetime "date_started"
t.string "trigger"
t.string "target"
t.string "reward"
t.text "comment"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "habits", ["user_id", "created_at"], name: "index_habits_on_user_id_and_created_at"
add_index "habits", ["user_id"], name: "index_habits_on_user_id"
create_table "levels", force: true do |t|
t.integer "user_id"
t.integer "habit_id"
t.integer "days_needed"
t.boolean "passed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "quantifieds", force: true do |t|
t.string "categories"
t.string "metric"
t.text "comment"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "quantifieds", ["user_id", "created_at"], name: "index_quantifieds_on_user_id_and_created_at"
add_index "quantifieds", ["user_id"], name: "index_quantifieds_on_user_id"
create_table "relationships", force: true do |t|
t.integer "follower_id"
t.integer "followed_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "relationships", ["followed_id"], name: "index_relationships_on_followed_id"
add_index "relationships", ["follower_id", "followed_id"], name: "index_relationships_on_follower_id_and_followed_id", unique: true
add_index "relationships", ["follower_id"], name: "index_relationships_on_follower_id"
create_table "results", force: true do |t|
t.integer "user_id"
t.string "result_value"
t.date "date_value"
t.integer "quantified_id"
t.boolean "good"
t.text "comment"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "taggings", force: true do |t|
t.integer "tag_id"
t.integer "taggable_id"
t.string "taggable_type"
t.integer "tagger_id"
t.string "tagger_type"
t.string "context", limit: 128
t.datetime "created_at"
end
add_index "taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "taggings_idx", unique: true
add_index "taggings", ["taggable_id", "taggable_type", "context"], name: "index_taggings_on_taggable_id_and_taggable_type_and_context"
create_table "tags", force: true do |t|
t.string "name"
t.integer "taggings_count", default: 0
end
add_index "tags", ["name"], name: "index_tags_on_name", unique: true
create_table "users", force: true do |t|
t.string "name"
t.string "email"
t.text "missed_days"
t.text "missed_levels"
t.string "provider"
t.string "uid"
t.string "oauth_token"
t.datetime "oauth_expires_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest"
t.string "remember_digest"
t.boolean "admin", default: false
t.string "activation_digest"
t.boolean "activated", default: false
t.datetime "activated_at"
t.string "reset_digest"
t.datetime "reset_sent_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
create_table "valuations", force: true do |t|
t.string "name"
t.text "comment"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "valuations", ["user_id", "created_at"], name: "index_valuations_on_user_id_and_created_at"
add_index "valuations", ["user_id"], name: "index_valuations_on_user_id"
end
pages_controller.rb
class PagesController < ApplicationController
def home
if logged_in?
#habits = current_user.habits.build
#valuations = current_user.valuations.build
#accomplished_goals = current_user.goals.accomplished
#unaccomplished_goals = current_user.goals.unaccomplished
#averaged_quantifieds = current_user.quantifieds.averaged
#instance_quantifieds = current_user.quantifieds.instance
#feed_items = current_user.feed.paginate(page: params[:page])
end
end
def about
end
end
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Thanks so much for your time! So far Infused's answer isn't working.

Answer 1

The simplest way to handle it is to combine the collections with +:
cond = ["user_id IN (#{following_ids}) OR user_id = :user_id", user_id: id]
Habit.where(cond) + Valuation.where(cond) + Goal.where(cond) + Quantified.where(cond)
As Matt Brictson mentioned in a comment, there may be a better way to aggregate the various models, but simply using + to join the collections will do the trick.