Class: Wings::Model::SQLite

Inherits:
Object show all
Defined in:
lib/wings/sqlite_model.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = nil) ⇒ SQLite

Returns a new instance of SQLite.



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# File 'lib/wings/sqlite_model.rb', line 66

def initialize(data = nil)
  @data = data
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object

column accessor



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# File 'lib/wings/sqlite_model.rb', line 102

def method_missing(name, *args)
  unless self.class.schema.keys.include?(name.to_s)
    return super
  end

  self.class.define_method(name.to_sym) do
    @data[name.to_s]
  end
  @data[name.to_s]
end

Class Method Details

.all ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 38

def self.all
  all_rows = db.execute "    SELECT * FROM \#{table};\n"

  all_rows.map do |row|
    data = Hash[schema.keys.zip(row)]
    self.new(data)
  end
end

.count ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 49

def self.count
  sql = "    SELECT COUNT(*) FROM \#{table};\n"
  db.execute(sql)[0][0]
end

.create(values) ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 8

def self.create(values)
  keys_without_id = schema.keys - ['id']

  db_attributes = keys_without_id.reduce({}) do |memo, key|
    memo[key] = values[key] ? to_sql(values[key]) : 'null'
    memo
  end

  db.execute "    INSERT INTO \#{table} (\#{db_attributes.keys.join(',')})\n    VALUES (\#{db_attributes.values.join(',')});\n"

  data = keys_without_id.reduce({}) do |memo, key|
    memo[key] = values[key]
    memo
  end
  data['id'] = db.execute('SELECT last_insert_rowid();')[0][0]
  self.new(data)
end

.find(id) ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 29

def self.find(id)
  target = db.execute "    SELECT * FROM \#{table} WHERE id = \#{id};\n"

  data = Hash[schema.keys.zip(target[0])]
  self.new(data)
end

.schema ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 56

def self.schema
  return @schema if @schema

  @schema = {}
  db.table_info(table) do |row|
    @schema[row['name']] = row['type']
  end
  @schema
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 70

def [](name)
  @data[name.to_s]
end

#[]=(name, value) ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 74

def []=(name, value)
  @data[name.to_s] = value
end

#save ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 97

def save
  self.save! rescue false
end

#save! ⇒ Object 



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# File 'lib/wings/sqlite_model.rb', line 78

def save!
  unless @data['id']
    self.class.create(@data)
    return true
  end

  fields = @data.map do |key, value|
    "#{key}=#{self.class.to_sql(value)}"
  end.join(',')

  self.class.db.execute "    UPDATE \#{self.class.table}\n    SET \#{fields}\n    WHERE id = \#{@data['id']};\n"

  true
end