Class: Raamen::SQLObject

Inherits:
Object
  • Object
show all
Extended by:
Associatable, Searchable
Defined in:
lib/raamen/sql_object.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Searchable

where

Methods included from Associatable

assoc_options, belongs_to, has_many, has_one_through

Constructor Details

#initialize(params = {}) ⇒ SQLObject

Returns a new instance of SQLObject.



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# File 'lib/raamen/sql_object.rb', line 68

def initialize(params = {})
  params.each do |col, value|
    col = col.to_sym
    raise "unknown attribute '#{col}'" unless self.class.columns.include?(col)
    self.send("#{col}=", value)
  end
end

Class Method Details

.all ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 42

def self.all
  parse_all(results = DBConnection.execute(<<-SQL))
    SELECT
      *
    FROM
      #{self.table_name}
  SQL
end

.columns ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 11

def self.columns
  @columns ||= DBConnection.execute2(<<-SQL).first.map(&:to_sym)
    SELECT
      *
    FROM
      #{self.table_name}
    LIMIT
      0
  SQL
end

.finalize! ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 22

def self.finalize!
  self.columns.each do |col|
    define_method(col) do
      attributes[col]
    end

    define_method("#{col}=") do |value|
      attributes[col] = value
    end
  end
end

.find(id) ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 57

def self.find(id)
  parse_all(DBConnection.execute(<<-SQL, id)).first
    SELECT
      *
    FROM
      #{self.table_name}
    WHERE
      id = ?
  SQL
end

.parse_all(results) ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 51

def self.parse_all(results)
  results.map do |result|
    self.new(result)
  end
end

.table_name ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 38

def self.table_name
  @table_name || self.name.tableize
end

.table_name=(table_name) ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 34

def self.table_name=(table_name)
  @table_name = table_name
end

Instance Method Details

#attribute_values ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 80

def attribute_values
  self.class.columns.map do |col|
    self.send(col)
  end
end

#attributes ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 76

def attributes
  @attributes ||= {}
end

#insert ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 86

def insert
  columns = self.class.columns.drop(1)
  col_names = columns.map(&:to_sym).join(", ")
  question_marks = (["?"] * columns.count).join(", ")

  DBConnection.execute(<<-SQL, attribute_values.drop(1))
    INSERT INTO
      #{self.class.table_name} (#{col_names})
    VALUES
      (#{question_marks})
  SQL

  self.id = DBConnection.last_insert_row_id
end

#save ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 116

def save
  id.nil? ? insert : update
end

#update ⇒ Object 



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# File 'lib/raamen/sql_object.rb', line 101

def update
  set_line = self.class.columns.map do |col|
    "#{col}= ?"
  end.join(", ")

  DBConnection.execute(<<-SQL, *attribute_values, id)
    UPDATE
      #{self.class.table_name}
    SET
      #{set_line}
    WHERE
      id = ?
  SQL
end