module CQL::Record(Pk)

Write documentation for Record module

Example Using the Record module

AcmeDB = CQL::Schema.define(:acme_db, adapter: CQL::Adapter::Postgres,
  uri: "postgresql://example:example@localhost:5432/example") do
  table :posts do
    primary :id, Int64, auto_increment: true
    text :title
    text :body
    timestamp :published_at
  end

  table :comments do
    primary
    bigint :post_id
    text :body
  end
end

struct Post < CQL::Record(Int64)

  db_context AcmeDB, :posts

  getter id : Int64?
  getter title : String
  getter body : String
  getter published_at : Time

  def initialize(@title : String, @body : String, @published_at : Time = Time.utc)
  end
end

struct Comment < CQL::Record(Int64)
  db_context AcmeDB, :comments

  getter id : Int64?
  getter post_id : Int64
  getter body : String

  def initialize(@post_id : Int64, @body : String)
  end
end

Instance Methods

def attributes(attrs : Hash(Symbol, DB::Any))

Set the record's attributes from a hash

• @param attrs [Hash(Symbol, DB::Any)] The attributes to set

• @return [Nil]

Example Setting the record's attributes

user.attributes = {name: "Alice", email: "[email protected]"}

def attributes

Define instance-level methods for querying and manipulating data Fetch the record's ID or raise an error if it's nil

• @return [PrimaryKey] The ID

Example Fetching the record's ID

user.attributes
-> { id: 1, name: "Alice", email: " [email protected]" }

def delete

Delete the record from the database

• @return [Nil]

Example Deleting the record

user.delete

def id

Identity method for the record ID

• @return [PrimaryKey] The ID

Example Fetching the record's ID

user.id

def id=(id : Pk)

Set the record's ID

• @param id [PrimaryKey] The ID

Example Setting the record's ID

user.id = 1

def persisted?

Check if the record has been persisted to the database

• @return [Bool] True if the record has an ID, false otherwise

Example Checking if the record is persisted

user.persisted?

def reload!

Define instance-level methods for querying and manipulating data Fetch the record's ID or raise an error if it's nil

• @return [PrimaryKey] The ID

Example Fetching the record's ID

user.reload!

def save

Define instance-level methods for saving and deleting records Save the record to the database or update it if it already exists

• @return [Nil]

Example Saving the record

user.save

def update(fields : Hash(Symbol, DB::Any))

Delete the record from the database if it exists

• @return [Nil]

Example Deleting the record

user.delete

def update

Update the record with the given record object

Example Updating the record

bob = User.new(name: "Bob", email: " [email protected]")
id = bob.save

bob.reload!
bon.name = "Juan"

bob.update

def update

Update the record with the given fields

• @param fields [Hash(Symbol, DB::Any)] The fields to update

• @return [Nil]

Example Updating the record

user.update(name: "Alice", email: " [email protected]")