I recently updated my Rails app from 4.0 to 4.1. Everything seems to work fine, except this one line in my Search Model that was working before.
Essentially, I want to search/find District_Resources by Tag Name and by the District_Resource Name.
**ex.**
If I search the word "Tutoring"
*I should get all District_Resources with the Resource_Tag "Tutoring"
*And all District Resources that include the word Tutoring in it's Name.
(i.e Tutoring Services)
For some reason, I keep getting this error:
(Mysql2::Error: Unknown column 'resource_tags.name' in 'where
clause': SELECT `district_resources`.* FROM `district_resources`
WHERE (resource_tags.name like '%Tutoring%' OR district_resources.name like '%Tutoring%')
ORDER BY `district_resources`.`name` ASC):
But that column does exist in the Resource_Tags table.
MODELS
class DistrictResource < ActiveRecord::Base
has_many :district_mappings, dependent: :destroy
has_many :resource_tags, through: :district_mappings
accepts_nested_attributes_for :resource_tags
end
class ResourceTag < ActiveRecord::Base
has_many :district_mappings, dependent: :destroy
has_many :district_resources, through: :district_mappings
end
class Search < ActiveRecord::Base
def district_resources
#district_resources ||= find_district_resources
end
def find_district_resources
district_resources = DistrictResource.order(:name)
district_resources = district_resources.includes(:resource_tags).where("resource_tags.name like :name OR district_resources.name like :name", {:name => "%#{name}%" })
district_resources
end
end
SCHEMA
create_table "district_resources", force: true do |t|
t.string "name"
t.string "description"
t.string "website"
t.string "phone"
t.string "email"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "district_mappings", force: true do |t|
t.integer "district_resource_id"
t.integer "resource_tag_id"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "resource_tags", force: true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
end
You are referencing district_resources in where clause but this is not joined in query as you are eager loading resource_tags so here are two solutions for this
1.
district_resources = district_resources.joins(:resource_tags).where("resource_tags.name like :name OR district_resources.name like :name", {:name => "%#{name}%" })
2.
district_resources = district_resources.includes(:resource_tags).refereces(resource_tags).where("resource_tags.name like :name OR district_resources.name like :name", {:name => "%#{name}%" })
In both of these cases we are telling rails that we are using resource_tags table in where clause so join district_resources with it
Fixed it!!
district_resources = district_resources.includes(:resource_tags).where("resource_tags.name like :name OR district_resources.name like :name", {:name => "%#{name}%" }).references(:resource_tags)
I had to reference the Resource_Tags Model
Related
i'm learning Rails and i'm doing an exercise to practice associations and migration files.
Currently, trying to make a models between users, auction item, and bids.
So far for the migrate files I have the following:
class CreateItem < ActiveRecord::Migration
def change
create_table :auction do |t|
t.string :item_name
t.string :condition
t.date :start_date
t.date :end_date
t.text :description
t.timestamps
end
end
end
class CreateBids < ActiveRecord::Migration
def change
create_table :bids do |t|
t.integer :user_id
t.integer :auction_id
t.timestamps
end
end
end
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :email
t.string :username
t.string :password_digest
t.timestamps
end
end
end
These are the following models:
class Bid < ActiveRecord::Base
belongs_to :bidder, class_name: "User", foreign_key: "bidder_id"
belongs_to :auction
end
class User < ActiveRecord::Base
has_many :bids
has_many :auctions, :foreign_key => 'bidder_id'
has_secure_password
end
class Auction < ActiveRecord::Base
belongs_to :seller, class_name: "User", foreign_key: :user_id
has_many :bids
has_many :bidders, through: :bids
end
Any suggestions or opinions? I'm currently trying to test the tables but auctions doesn't seem to be working...
Specifically, my auction table can't seem to find a user_id and therefore a user doesn't have any auctions.
foreign_key refers to the _id (by default) or any unique attribute used to associate the models.
I can't see bidder model, you need to replace them with user_id as they are associated to user model.
Refer for more details belongs_to
class CreateBids < ActiveRecord::Migration
def change
create_table :bids do |t|
t.integer :user_id **do not think this is correct**
t.integer :auction_id **or this one**
t.timestamps
end
end
end
You want to use something more along the lines of the following
class CreateGames < ActiveRecord::Migration[5.0]
def change
create_table :games do |t|
t.integer :total_time
t.references :version, foreign_key: true **#this is how a foreign key should be declared**
t.integer :total_points
t.timestamps
end
end
end
Alternatively, if you want to change things in future migrations you can always add a reference:
def change
add_reference :levels, :version, foreign_key: true
end
I'm trying to create some referential integrity across several tables, and am tripping over the placement of add foreign keys. At best the statement is ignored, worst it throws an error.
class CreateCantons < ActiveRecord::Migration
def change
create_table :cantons do |t|
t.integer :canton_id
t.string :canton_name
t.timestamps null: false
end
end
end
class CreateResources < ActiveRecord::Migration
def change
create_table :resources do |t|
t.integer :resource_id
t.string :resource_name
t.integer :type_id
t.integer :canton_id
t.string :url
t.string :address
t.string :city
t.string :state
t.string :zip
add_foreign_key :cantons, :canton_id #ignored
add_foreign_key :types, :type_id #ignored
t.timestamps null: false
end
end
end
class CreateResourceContacts < ActiveRecord::Migration
def change
create_table :resource_contacts do |t|
t.integer :contact_id
t.integer :resource_id
add_foreign_key :resources, :resource_id
add_foreign_key :contacts, :contact_id
t.timestamps null: false
end
end
end
adding a t in front throws an error
t.add_foreign_key :contacts, :contact_id #error
How do I properly use this command?
you need to move the foreign_keys outside of the create table
class CreateResources < ActiveRecord::Migration
def change
create_table :resources do |t|
t.integer :resource_id
t.string :resource_name
t.integer :type_id
t.integer :canton_id
t.string :url
t.string :address
t.string :city
t.string :state
t.string :zip
t.timestamps null: false
end
add_foreign_key :resources, :cantons
add_foreign_key :resources, :types
end
end
see http://edgeapi.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_foreign_key
And also you need to tell it what tables you are adding it to.
These are my tables:
create_table :messages do |t|
t.integer :type
t.string :text
t.datetime :sent_date
t.string :sender
t.timestamps
end
create_table :users do |t|
t.integer :phone
t.string :fullname
t.string :profile_image
t.timestamps
end
create_table :send_tos do |t|
t.string :receiver
t.belongs_to :message
t.boolean :is_received
end
and these are the model classes:
class User < ActiveRecord::Base
has_many :send_tos, :foreign_key => 'receiver'
has_many :messages, :foreign_key => 'sender'
end
class Message < ActiveRecord::Base
belongs_to :user, :foreign_key => 'sender'
has_many :send_tos
end
class Send_to < ActiveRecord::Base
belongs_to :user, :foreign_key => "receiver"
belongs_to :message
end
When I run these commands on rails console:
m = Message.new
m.save
s = Send_to.new
s.message = m
s.save
m.send_tos
After command m.send_tos I get this error:
RuntimeError: Circular dependency detected while autoloading constant
SendTo
Why am I getting this error? What should I do to change it?
Change the name of the Send_to class to SendTo. This follows the naming convention that Rails assumes for its relationships. The name of the file it is in should be send_to.rb
Here is how to join two models
User.where(:id => 1).joins(:posts)
but how to join two models with module/namspace
#schedules= Swimming::Classschedule.joins(:Swimming::Slot).where(:date => #date)
seems not working properly (with error message)
:Swimming is not a class/module
UPDATE
I have updated to
#schedules= Swimming::Classschedule.joins(:swimming_slots).where(:date => #date)
and I do have this table
create_table :swimming_classschedules do |t|
t.integer :slot_id
t.integer :coach_id
t.integer :level_id
t.string :note
t.timestamps
end
create_table :swimming_slots do |t|
t.string :date
t.string :start
t.string :end
t.timestamps
end
Howcome I got this error
Association named 'swimming_slots' was not found; perhaps you misspelled it?
update 2
add this line to Swimming::Classschedule module
belongs_to :swimming_slots ,:class_name=>'Swimming::Slot',:foreign_key => "slot_id"
and
change joins to
#schedules= Swimming::Classschedule.joins(:swimming_slots).where(:swimming_slots =>{:date => #date})
Now it works
you pass the association name to joins. for example, if you have an association like
has_many :swimming_slots, class_name: 'Swimming::Classschedule'
then you pass swimming_slots and rails will do the joins for you.
User.joins(:swimming_slots)
UPDATE:
if slot_id refers to a record in the swimming_slots table, you should have something like
belongs_to :slot, class_name: 'Swimming::Slot'
in your class schedule model. If you have that, you should be able to do
Swimming::Classschedule.joins(:slot)
How can I set one of my database table to created_at as default value. I did this but didn't work, I have checked in the DB and the value of code is null.
class CreateEvents < ActiveRecord::Migration
def change
create_table :events do |t|
t.string :title
t.string :location
t.text :description
t.date :occurs_on
t.string :code, :default => Event::created_at
t.timestamps
end
end
end