Class: CouchTap::Destroyers::Table

Inherits:
Object
  • Object
show all
Defined in:
lib/couch_tap/destroyers/table.rb

Overview

The table destroyer will go through a table definition and make sure that all rows that belong to the document’s id are deleted from the system.

It’ll automatically go through each collection definition and recursively ensure that everything has been cleaned up.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, name, opts = {}, &block) ⇒ Table

Returns a new instance of Table.



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# File 'lib/couch_tap/destroyers/table.rb', line 17

def initialize(parent, name, opts = {}, &block)
  @_collections = []

  @parent = parent
  @name   = name

  @primary_keys = parent.primary_keys.dup

  # As we're deleting, only assign the primary key for the first table
  if @primary_keys.empty?
    @primary_keys << (opts[:primary_key] || "#{@name.to_s.singularize}_id").to_sym
  end

  instance_eval(&block) if block_given?
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/couch_tap/destroyers/table.rb', line 15

def name
  @name
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/couch_tap/destroyers/table.rb', line 15

def parent
  @parent
end

#primary_keys ⇒ Object (readonly)

Returns the value of attribute primary_keys.



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# File 'lib/couch_tap/destroyers/table.rb', line 15

def primary_keys
  @primary_keys
end

Instance Method Details

#collection(field, opts = {}, &block) ⇒ Object

DSL methods



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# File 'lib/couch_tap/destroyers/table.rb', line 54

def collection(field, opts = {}, &block)
  @_collections << Collection.new(self, opts, &block)
end

#column(*args) ⇒ Object

Dummy helper methods



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# File 'lib/couch_tap/destroyers/table.rb', line 60

def column(*args)
  nil
end

#data ⇒ Object 



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# File 'lib/couch_tap/destroyers/table.rb', line 69

def data
  {}
end

#document ⇒ Object Also known as: doc 



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# File 'lib/couch_tap/destroyers/table.rb', line 64

def document
  {}
end

#execute ⇒ Object 



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# File 'lib/couch_tap/destroyers/table.rb', line 33

def execute
  dataset = handler.database[name]
  dataset.where(key_filter).delete
  @_collections.each do |collection|
    collection.execute
  end
end

#handler ⇒ Object 



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# File 'lib/couch_tap/destroyers/table.rb', line 41

def handler
  parent.handler
end

#key_filter ⇒ Object

Unlike building new rows, delete only requires the main primary key to be available.



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# File 'lib/couch_tap/destroyers/table.rb', line 46

def key_filter
  {
    @primary_keys.first => handler.id
  }
end