I am trying to establish relationship between two tables in rails so
that I can share data between the two tables. However,am not able to
enter data into the operating tables. Any help would be highly appreciated.
#below are models#
class Location < ApplicationRecord
has_many :operatings
end
class Operating < ApplicationRecord
belongs_to :location
end
##below are my tables##
enable_extension "plpgsql"
create_table "locations", force: :cascade do |t|
t.string "country"
t.string "supra_region"
t.string "region"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "operatings", force: :cascade do |t|
t.string "operating_company_name"
t.string "address"
t.date "year_formed"
t.string "other_operational_countries"
t.string "about_company"
t.string "current_focus"
t.string "incumbent_irm_contractor"
t.string "irm_frame_agreements"
t.text "estimated_irm_budgets"
t.integer "location_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["location_id"], name: "index_operatings_on_location_id", using: :btree
end
add_foreign_key "operatings", "locations"
###below is my operating controller###
def create
#operating = Operating.new(op_company)
if #operating.save
flash[:success] = "A recorded has been successfully Saved"
redirect_to operatings_path
else
render 'new'
end
end
####routes####
resources :offshores, :index, :show, :new, :create, :destroy
resources :locations, :index, :show, :new, :create, :destroy
Try
class Operating < ApplicationRecord
belongs_to :location, :optional => true
end
belongs_to will check is the association present, you can debug by printing the Operating's errors
operating = Operating.create
operating.errors.messages
Related
I'm a beginner in rails and am making a card app. I have a user, card, and user_card models with a many to many, through relationship set up between the cards and users. My problem is that when I return the card table and try to include: the users I get an empty array. I've tried resetting the database but still nothing.
ActiveRecord::Schema.define(version: 2022_06_15_200100) do
create_table "cards", force: :cascade do |t|
t.string "name"
t.string "image"
t.string "text"
t.integer "level"
t.string "types"
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
t.integer "quantity", default: 0
end
create_table "user_cards", force: :cascade do |t|
t.integer "user_id"
t.integer "card_id"
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
t.index ["card_id"], name: "index_user_cards_on_card_id"
t.index ["user_id"], name: "index_user_cards_on_user_id"
end
create_table "users", force: :cascade do |t|
t.string "username"
t.string "password_digest"
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
end
class User < ApplicationRecord
has_secure_password
has_many :user_cards
has_many :cards, through: :user_cards
end
class Card < ApplicationRecord
has_many :user_cards
has_many :users, through: :user_cards
end
class UserCard < ApplicationRecord
belongs_to :user
belongs_to :card
end
controller
class CardsController < ApplicationController
wrap_parameters false
def create
card = Card.create(card_params)
if card.valid?
render json: card, status: :created, include: :users
else
render json:{errors: card.errors}
end
def index
card = Card.all
render json: card, include: :users
end
In order for the User.first.cards to work, you need to ensure the application is inserting data in the user_cards table.
You may check if there are any records in there by doing UserCard.all in your rails console.
Coming to the controller, after creating a card record, you have to assign it to a user record in order for the relationship to be established.
def create
card = Card.create(card_params)
if card.valid?
card.users << current_user # Or card.users << (any user object like) User.first
render json: card, status: :created, include: :users
else
render json:{errors: card.errors}
end
end
card.users << user object will create the necessary record in the user_cards table and you'll be able to access them using includes: :user
You may refer the examples given - here in the Rails API guide
I have 3 models, Challenge, Pun, User (managed by Clearance gem)
A User can create a Challenge. A Challenge contains many puns. A User can also create a Pun.
Everything is fine until I set a Pun to belong_to a User, then suddenly Puns are no longer saved.
class User < ApplicationRecord
include Clearance::User
has_many :challenges
has_many :puns
end
class Challenge < ApplicationRecord
has_many :puns, :dependent => :delete_all
belongs_to :user
end
class Pun < ApplicationRecord
belongs_to :challenge
belongs_to :user
end
In my PunController I have tried to establish the current_user id
def create
#pun = #challenge.puns.create(pun_params)
#pun.user_id = current_user.id if current_user
redirect_to #challenge
end
private
def set_challenge
#challenge = Challenge.find(params[:challenge_id])
end
def pun_params
params[:pun].permit(:pun_text,:user_id)
end
What am I doing wrong? I'm trying to keep it as simple as possible, but seems like Users don't want to be associated with more than one thing, particularly if nested. Is this a Clearance issue?
DB setup:
create_table "challenges", force: :cascade do |t|
t.text "title"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.datetime "start_time"
t.datetime "end_time"
t.bigint "user_id"
t.index ["user_id"], name: "index_challenges_on_user_id"
end
create_table "puns", force: :cascade do |t|
t.text "pun_text"
t.bigint "challenge_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.bigint "user_id"
t.index ["challenge_id"], name: "index_puns_on_challenge_id"
t.index ["user_id"], name: "index_puns_on_user_id"
end
create_table "users", force: :cascade do |t|
t.string "name"
t.string "email"
t.string "tagline"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "encrypted_password", limit: 128
t.string "confirmation_token", limit: 128
t.string "remember_token", limit: 128
t.index ["email"], name: "index_users_on_email"
t.index ["remember_token"], name: "index_users_on_remember_token"
end
Well in you currrent code you don't save user_id after setting it. And if you do not expect creation to fail you can do "create!".
So you can try:
def create
#challenge.puns.create!(pun_params.merge(user_id: current_user.id))
redirect_to #challenge
end
You can do this using simply hidden_field like in the form
<%= object.hidden_field :user_id, value: current_user.id %>
it won't work without user session because the relationship does not optional, and remove this line from the controller
#pun.user_id = current_user.id if current_user
and redirect
redirect_to #pun
it will work
I am trying to link the location and the operating tables so that I can display some data in location table in the operatings views. However, I am stuck and don't know what to do. Any help would be appreciated.
#below are models#
class Location < ApplicationRecord
has_many :operatings
end
class Operating < ApplicationRecord
belongs_to :location
end
##below are my tables##
enable_extension "plpgsql"
create_table "locations", force: :cascade do |t|
t.string "country"
t.string "supra_region"
t.string "region"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "operatings", force: :cascade do |t|
t.string "operating_company_name"
t.string "address"
t.date "year_formed"
t.string "other_operational_countries"
t.string "about_company"
t.string "current_focus"
t.string "incumbent_irm_contractor"
t.string "irm_frame_agreements"
t.text "estimated_irm_budgets"
t.integer "location_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["location_id"], name: "index_operatings_on_location_id", using: :btree
end
add_foreign_key "operatings", "locations"
###below is my operating controller###
def create
#operating = Operating.new(op_company)
if #operating.save
flash[:success] = "A recorded has been successfully Saved"
redirect_to operatings_path
else
render 'new'
end
end
####routes####
resources :offshores, :index, :show, :new, :create, :destroy
resources :locations, :index, :show, :new, :create, :destroy
Since your Location and Operating models are linked together using has_many and belongs_to, if you have an operating object in your template, you can easily access the attributes of its location:
<% #operatings.each do |operating| %>
<div>The name of its location: <%= operating.location.name %></div>
<% end %>
You need to be careful with this though. If you only fetch the operatings from the database, accessing each operating's location attribute in that each loop will trigger a separate database query for every operating item. This is called an N+1 query, and it is very inefficient. To fix the problem, make sure to pre-fetch the associated location as well when loading operatings using includes:
# in the controller
#operatings = Operating.all.includes(:location)
This way the associated locations of every operating will be fetched using just a single query.
In my app User can have many Companies and vice versa. In Accounts table id of User and id of its Company is stored.
I want to find all Users who belong to Companies, which belong to current_user. Let's assume that the current_user is like master User (not Admin, as that would be system Admin) of those companies.
How do I do this? My guess is to do it with Arel, but then how should it look in Model, Controller, View? Many thanks for any help. I'm on Rails 5.
models/user.rb
class User < ApplicationRecord
has_many :accounts, dependent: :destroy
has_many :companies, through: :accounts
models/account.rb
class Account < ApplicationRecord
belongs_to :company
belongs_to :user
accepts_nested_attributes_for :company, :user
models/company.rb
class Company < ApplicationRecord
has_many :accounts, dependent: :destroy
has_many :users, through: :accounts
accepts_nested_attributes_for :accounts, :users
My schema.rb looks like this:
create_table "accounts", force: :cascade do |t|
t.integer "company_id"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["company_id"], name: "index_accounts_on_company_id"
t.index ["user_id"], name: "index_accounts_on_user_id"
end
create_table "companies", force: :cascade do |t|
t.string "name"
t.string "legal_name"
t.string "reg_number"
t.string "address"
t.string "bank_acc"
t.string "description"
t.string "website"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "role", default: 0
t.integer "currency", default: 0
end
create_table "users", force: :cascade do |t|
t.string "name"
t.string "email"
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.index ["email"], name: "index_users_on_email", unique: true
end
You can find current user's companies, and eager load users who belong to those companies
#companies = current_user.companies.includes(:users)
To list all users(may be in a view), loop through #companies and all its users
#companies.each do |company|
company.users.each do |user|
puts user.name
end
end
Or use map/collect to assign them to a variable.
#users = #companies.map(&:users).flatten
Iv'e gotten myself into a bit of a brain mess up these past two days. I'd like to be able to allow my users to create a campaign (same concept as surveys), it will allow them to request certain data they wish such as an email address. This will then allow the person completing the form to proceed and receive a download link after entering an email. The email entered should be stored for the person who created the campaign to view.
Iv'e taken the approach with nested forms, however I ran into the trouble of allowing emails to be entered and saved for the campaign creator to view.
Any help is appreciated, thanks.
campaign.rb model
class Campaign < ActiveRecord::Base
belongs_to :user
has_many :queries
accepts_nested_attributes_for :queries
end
query.rb model
class Query < ActiveRecord::Base
belongs_to :campaign
has_many :results
end
result.rb model
class Result < ActiveRecord::Base
attr_accessible :content, :email, :query_id
belongs_to :query
end
schema.rb
create_table "campaigns", force: :cascade do |t|
t.string "title"
t.text "description"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "campaigns", ["user_id"], name: "index_campaigns_on_user_id", using: :btree
create_table "queries", force: :cascade do |t|
t.integer "campaign_id"
t.text "content"
t.string "email"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "queries", ["campaign_id"], name: "index_queries_on_campaign_id", using: :btree
create_table "results", force: :cascade do |t|
t.integer "query_id"
t.text "content"
t.string "email"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "results", ["query_id"], name: "index_results_on_query_id", using: :btree
Part of campaign_controller.rb
private
# Use callbacks to share common setup or constraints between actions.
def set_campaign
#campaign = Campaign.find(params[:id])
end
def campaign_params
params.require(:campaign).permit(:title, :description, :queries_attributes)
end
def query_params
params.require(:query).permit(:content, :email, :campaign_id)
end