I'm trying to change a column called "description" in my table called "posts" to a .text rather than a .string so I can avoid getting errors for the value being too long.
I generated a new migration and ran rake db:migrate after having this:
class ChangePostsFormatInMyTable < ActiveRecord::Migration
def self.up
change_column :posts, :description, :text, :limit => nil
end
def self.down
change_column :posts, :description, :string
end
end
But the schema file doesn't show any changes and my column won't change. Am I missing something?
Schema:
ActiveRecord::Schema.define(version: 20140125221803) do
create_table "posts", force: true do |t|
t.string "description"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "user_id"
t.string "image_file_name"
t.string "image_content_type"
t.integer "image_file_size"
t.datetime "image_updated_at"
t.string "title"
t.string "image"
end
end
Related
I am trying to add created at for a value in a column
for example if I added a new invoice it will show me the date that I add the invoice not the date I add the case
<%= #case.invoice.created_at %>
This gives me null
in my database
class AddAttachmentInvoiceToCases < ActiveRecord::Migration
def self.up
change_table :cases do |t|
t.attachment :invoice
end
end
def self.down
remove_attachment :cases, :invoice
end
end
in my schema
create_table "cases", force: :cascade do |t|
t.string "pt_first_name"
t.string "pt_last_name"
t.date "date_received"
t.date "due_date"
t.string "shade"
t.string "mould"
t.string "upper_lower"
t.integer "user_id"
t.string "invoice_file_name"
t.string "invoice_content_type"
t.integer "invoice_file_size", limit: 8
t.datetime "invoice_updated_at"
t.string "implant_brand"
t.string "implant_quantity"
t.integer "number"
t.boolean "finished"
t.boolean "ship"
t.boolean "outsourced"
t.string "invoice2_file_name"
t.string "invoice2_content_type"
t.integer "invoice2_file_size", limit: 8
t.datetime "invoice2_updated_at"
t.string "invoice3_file_name"
t.string "invoice3_content_type"
t.integer "invoice3_file_size", limit: 8
t.datetime "invoice3_updated_at"
t.string "invoice4_file_name"
t.string "invoice4_content_type"
t.integer "invoice4_file_size", limit: 8
t.datetime "invoice4_updated_at"
t.string "invoice5_file_name"
t.string "invoice5_content_type"
t.integer "invoice5_file_size", limit: 8
t.datetime "invoice5_updated_at"
t.datetime "created_at"
t.datetime "updated_at"
end
In the migration for the Invoice do you have t.timestamps?
For example:
class CreateInvoices < ActiveRecord::Migration
def change
create_table :invoices do |t|
t.string :name
t.text :description
t.timestamps
end
end
end
If not you may need to add those
class AddTimestampsToInvoice < ActiveRecord::Migration
def change
add_column :invoices, :created_at, :datetime, null: false
add_column :invoices, :updated_at, :datetime, null: false
end
end
class CreateMessages < ActiveRecord::Migration[5.2]
def change
create_table :messages do |t|
t.text :body
t.integer :user_id
t.timestamps
end
end
end
After running rails db:migrate my schema looks like this...
ActiveRecord::Schema.define(version: 2020_03_20_063104) do
create_table "messages", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "users", force: :cascade do |t|
t.string "username"
t.string "password_digest"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
end
I am wondering where the t.text "body" is and where the t.integer "user_id"is and why it isn't showing up in my schema under messages table.
I have checked migration status and all migrations have been ran.
If you ran something like this in your migration file
class CreateMessages < ActiveRecord::Migration[5.2]
def change
create_table :messages do |t|
t.timestamps
end
end
end
Messages table is created and after this you can't create another migration with create_table :messages. Like #Marek Lipka wrote on comments. Either you need to rollback your CreateMessages migration and chance file and run your migration again. Or you need to write another migration to change existing table like this.
class AddBodyAndUserIdToMessages < ActiveRecord::Migration[5.2]
def change
add_column :messages, :body, :text
add_column :messages, :user_id, :integer
end
end
I've been having trouble to do a challenge with Active Records, I read the documentation, and seen other examples with belongs_to that I remade and worked, I have no clue anymore about what I'm doing wrong here when I try to call recipe.recipe_type.name I get the error Rails NoMethodError: undefined method `name' for "#":String
schema.rb
create_table "recipe_types", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "recipe_type_id"
t.index ["recipe_type_id"], name: "index_recipe_types_on_recipe_type_id"
end
create_table "recipes", force: :cascade do |t|
t.string "title"
t.string "cuisine"
t.string "difficulty"
t.integer "cook_time"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.text "ingredients"
t.text "cook_method"
end
end
migrations
def change
create_table :recipes do |t|
t.string :title
t.string :cuisine
t.string :difficulty
t.integer :cook_time
t.timestamps
end
end
end
class AddFieldsToRecipe < ActiveRecord::Migration[5.2]
def change
add_column :recipes, :ingredients, :text
add_column :recipes, :cook_method, :text
end
end
class CreateRecipeTypes < ActiveRecord::Migration[5.2]
def change
create_table :recipe_types do |t|
t.string :name
t.timestamps
end
end
end
class AddRecipeRefToRecipeType < ActiveRecord::Migration[5.2]
def change
add_reference :recipe_types, :recipe_type, foreign_key: true
end
end
You seemed to have added the recipe_type reference to the wrong table. Your last migration should probably have been
add_reference :recipes, :recipe_type, foreign_key: true
because as it is, you have added the reference_type reference to ReferenceType.
So the final schema was:
ActiveRecord::Schema.define(version: 2020_03_26_013134) do
create_table "recipe_types", force: :cascade do |t|
t.string "name"
t.integer "recipe_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["recipe_id"], name: "index_recipe_types_on_recipe_id"
end
create_table "recipes", force: :cascade do |t|
t.string "title"
t.string "cuisine"
t.string "difficulty"
t.integer "cook_time"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.text "ingredients"
t.text "cook_method"
t.integer "recipe_type_id"
t.index ["recipe_type_id"], name: "index_recipes_on_recipe_type_id"
end
end
and with
models/recipe_type
class RecipeType < ApplicationRecord
has_many :recipes
end
models/recipe
class Recipe < ApplicationRecord
belongs_to :recipe_type
end
You can start a simple has_many belongs_to active record association, I hope this helps as many people as those who helped me, in the beginning of this journey, strongly recommend to study db:migrate, db:rollback, db:create and db:drop for those who encounter some trouble.
A very similar question was already asked, bud I can't solve the problem anyway. I am trying to create a new record in rails console and I get this error:
2.1.2 :001 > subject = Subject.new
Mysql2::Error: Table 'simple_cms_development.subjects' doesn't exist: SHOW FULL FIELDS FROM `subjects`
ActiveRecord::StatementInvalid: Mysql2::Error: Table 'simple_cms_development.subjects' doesn't exist: SHOW FULL FIELDS FROM `subjects`
Can somebody please very specifically tell my what should I do?
Here's subject.rb:
class Subject < ActiveRecord::Base
end
and schema.rb:
ActiveRecord::Schema.define(version: 20140617074943) do
create_table "admin_users", force: true do |t|
t.string "first_name", limit: 25
t.string "last_name", limit: 50
t.string "email", default: "", null: false
t.string "username", limit: 25
t.string "password", limit: 40
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "pages", force: true do |t|
t.integer "subject_id"
t.string "name"
t.string "permalink"
t.integer "position"
t.boolean "visible", default: false
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "pages", ["permalink"], name: "index_pages_on_permalink", using: :btree
add_index "pages", ["subject_id"], name: "index_pages_on_subject_id", using: :btree
create_table "sections", force: true do |t|
t.integer "page_id"
t.string "name"
t.integer "position"
t.boolean "visible", default: false
t.string "content_tipe"
t.text "content"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "sections", ["page_id"], name: "index_sections_on_page_id", using: :btree
end
create_subjects.rb:
class CreateSubjects < ActiveRecord::Migration
def up
create_table :subjects do |t|
t.string "name"
t.integer "position"
t.boolean "visible" :default => false
t.timestamps
end
end
def down
drop_table :subjects
end
end
Add a comma in
t.boolean "visible" :default => false`
as in
t.boolean "visible", :default => false`
and then run rake db:migrate
Making sure that config/database.yml file has a valid entry for a database connection on your machine. Look at the development stanza.
More on migrations at guides.rubyonrails.org/migrations.html
More on configuring a database and the database.yml file at
http://edgeguides.rubyonrails.org/configuring.html#configuring-a-database
You need to create a subjects table that defines the attributes you want to persist in the Subject instances.
So say you want title and description. Use this command to create the migration:
rails generate migration subjects title:string description:text
And then run the command
rake db:migrate
Then try your Subject.new command
Alternatively, if you do not want to persist any subject attributes, change the subject class definition to:
class Subject
end
The question can't be explained more.
db/migrate/20140415150026_create_poll_answers.rb
class CreatePollAnswers < ActiveRecord::Migration
def change
create_table :poll_answers do |t|
t.string :content
t.integer :counter
t.boolean :instant_value
t.timestamps
end
end
end
db/schema
create_table "poll_answers", force: true do |t|
t.string "content"
t.integer "counter"
t.boolean "instant_value"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "poll_question_id"
end
I found an answer to this but I am not sure it works for rails 4 and I also don't know where I should write it !!!
add_column :Table_name, :colman_name, :data_type, :default => "default"
You can simply set defaults like this for new migrations:
create_table :poll_answers, force: true do |t|
t.string :content, default: 'no_text'
t.integer :counter, default: 0
t.float :money_in_pocket, default: 0.0
end
Or you can change existing migrations like this:
def change
change_column :poll_answers, :counter, :integer, default: 100
end
Or even shorter:
change_column_default(:poll_answers, :counter, 3000)