Class: CouchRest::Database

Inherits:
Object show all
Defined in:
lib/couchrest/core/database.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server, name) ⇒ Database

Create a CouchRest::Database adapter for the supplied CouchRest::Server and database name.

Parameters

server<CouchRest::Server>

database host

name<String>

database name



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# File 'lib/couchrest/core/database.rb', line 16

def initialize(server, name)
  @name = name
  @server = server
  @host = server.uri
  @uri = @root = "#{host}/#{name.gsub('/','%2F')}"
  @streamer = Streamer.new(self)
  @bulk_save_cache = []
  @bulk_save_cache_limit = 500  # must be smaller than the uuid count
end

Instance Attribute Details

#bulk_save_cache_limit ⇒ Object

Returns the value of attribute bulk_save_cache_limit.



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# File 'lib/couchrest/core/database.rb', line 7

def bulk_save_cache_limit
  @bulk_save_cache_limit
end

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/couchrest/core/database.rb', line 6

def host
  @host
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/couchrest/core/database.rb', line 6

def name
  @name
end

#root ⇒ Object (readonly)

Returns the value of attribute root.



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# File 'lib/couchrest/core/database.rb', line 6

def root
  @root
end

#server ⇒ Object (readonly)

Returns the value of attribute server.



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# File 'lib/couchrest/core/database.rb', line 6

def server
  @server
end

#uri ⇒ Object (readonly)

Returns the value of attribute uri.



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# File 'lib/couchrest/core/database.rb', line 6

def uri
  @uri
end

Instance Method Details

#bulk_save(docs = nil, use_uuids = true) ⇒ Object Also known as: bulk_delete

POST an array of documents to CouchDB. If any of the documents are missing ids, supply one from the uuid cache.

If called with no arguments, bulk saves the cache of documents to be bulk saved.



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# File 'lib/couchrest/core/database.rb', line 168

def bulk_save(docs = nil, use_uuids = true)
  if docs.nil?
    docs = @bulk_save_cache
    @bulk_save_cache = []
  end
  if (use_uuids) 
    ids, noids = docs.partition{|d|d['_id']}
    uuid_count = [noids.length, @server.uuid_batch_count].max
    noids.each do |doc|
      nextid = @server.next_uuid(uuid_count) rescue nil
      doc['_id'] = nextid if nextid
    end
  end
  CouchRest.post "#{@uri}/_bulk_docs", {:docs => docs}
end

#compact! ⇒ Object

Compact the database, removing old document revisions and optimizing space use.



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# File 'lib/couchrest/core/database.rb', line 228

def compact!
  CouchRest.post "#{@uri}/_compact"
end

#copy(doc, dest) ⇒ Object

DEPRECATION NOTICE



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# File 'lib/couchrest/core/database.rb', line 222

def copy(doc, dest)
  puts "CouchRest::Database's copy method is being deprecated, please use copy_doc instead"
  copy_doc(doc, dest)
end

#copy_doc(doc, dest) ⇒ Object

COPY an existing document to a new id. If the destination id currently exists, a rev must be provided. dest can take one of two forms if overwriting: “id_to_overwrite?rev=revision” or the actual doc hash with a ‘_rev’ key

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/core/database.rb', line 210

def copy_doc(doc, dest)
  raise ArgumentError, "_id is required for copying" unless doc['_id']
  slug = escape_docid(doc['_id'])        
  destination = if dest.respond_to?(:has_key?) && dest['_id'] && dest['_rev']
    "#{dest['_id']}?rev=#{dest['_rev']}"
  else
    dest
  end
  CouchRest.copy "#{@uri}/#{slug}", destination
end

#create! ⇒ Object

Create the database



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# File 'lib/couchrest/core/database.rb', line 233

def create!
  bool = server.create_db(@name) rescue false
  bool && true
end

#delete(doc, bulk = false) ⇒ Object

DEPRECATION NOTICE



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# File 'lib/couchrest/core/database.rb', line 202

def delete(doc, bulk=false)
  puts "CouchRest::Database's delete method is being deprecated, please use delete_doc instead"
  delete_doc(doc, bulk)
end

#delete! ⇒ Object

DELETE the database itself. This is not undoable and could be rather catastrophic. Use with care!



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# File 'lib/couchrest/core/database.rb', line 261

def delete!
  CouchRest.delete @uri
end

#delete_attachment(doc, name) ⇒ Object

DELETE an attachment directly from CouchDB



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# File 'lib/couchrest/core/database.rb', line 112

def delete_attachment doc, name
  uri = uri_for_attachment(doc, name)
  # this needs a rev
  JSON.parse(RestClient.delete(uri))
end

#delete_doc(doc, bulk = false) ⇒ Object

DELETE the document from CouchDB that has the given _id and _rev.

If bulk is true (false by default) the deletion is recorded for bulk-saving (bulk-deletion :) later. Bulk saving happens automatically when #bulk_save_cache limit is exceded, or on the next non bulk save.

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/core/database.rb', line 190

def delete_doc(doc, bulk = false)
  raise ArgumentError, "_id and _rev required for deleting" unless doc['_id'] && doc['_rev']      
  if bulk
    @bulk_save_cache << { '_id' => doc['_id'], '_rev' => doc['_rev'], '_deleted' => true }
    return bulk_save if @bulk_save_cache.length >= @bulk_save_cache_limit
    return { "ok" => true } # Mimic the non-deferred version
  end
  slug = escape_docid(doc['_id'])        
  CouchRest.delete "#{@uri}/#{slug}?rev=#{doc['_rev']}"
end

#documents(params = {}) ⇒ Object

Query the _all_docs view. Accepts all the same arguments as view.



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# File 'lib/couchrest/core/database.rb', line 37

def documents(params = {})
  keys = params.delete(:keys)
  url = CouchRest.paramify_url "#{@uri}/_all_docs", params
  if keys
    CouchRest.post(url, {:keys => keys})
  else
    CouchRest.get url
  end
end

#fetch_attachment(doc, name) ⇒ Object

GET an attachment directly from CouchDB



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# File 'lib/couchrest/core/database.rb', line 95

def fetch_attachment(doc, name)
  # slug = escape_docid(docid)        
  # name = CGI.escape(name)
  uri = uri_for_attachment(doc, name)
  RestClient.get uri
  # "#{@uri}/#{slug}/#{name}"
end

#get(id, params = {}) ⇒ Object

GET a document from CouchDB, by id. Returns a Ruby Hash.



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# File 'lib/couchrest/core/database.rb', line 80

def get(id, params = {})
  slug = escape_docid(id)
  url = CouchRest.paramify_url("#{@uri}/#{slug}", params)
  result = CouchRest.get(url)
  return result unless result.is_a?(Hash)
  doc = if /^_design/ =~ result["_id"]
    Design.new(result)
  else
    Document.new(result)
  end
  doc.database = self
  doc
end

#info ⇒ Object

GET the database info from CouchDB



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# File 'lib/couchrest/core/database.rb', line 32

def info
  CouchRest.get @uri
end

#put_attachment(doc, name, file, options = {}) ⇒ Object

PUT an attachment directly to CouchDB



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# File 'lib/couchrest/core/database.rb', line 104

def put_attachment(doc, name, file, options = {})
  docid = escape_docid(doc['_id'])
  name = CGI.escape(name)
  uri = uri_for_attachment(doc, name)       
  JSON.parse(RestClient.put(uri, file, options))
end

#recreate! ⇒ Object

Delete and re create the database



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# File 'lib/couchrest/core/database.rb', line 239

def recreate!
  delete!
  create!
rescue RestClient::ResourceNotFound
ensure
  create!
end

#replicate_from(other_db) ⇒ Object

Replicates via “pulling” from another database to this database. Makes no attempt to deal with conflicts.

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/core/database.rb', line 248

def replicate_from other_db
  raise ArgumentError, "must provide a CouchReset::Database" unless other_db.kind_of?(CouchRest::Database)
  CouchRest.post "#{@host}/_replicate", :source => other_db.root, :target => name
end

#replicate_to(other_db) ⇒ Object

Replicates via “pushing” to another database. Makes no attempt to deal with conflicts.

Raises:

  • (ArgumentError) 


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# File 'lib/couchrest/core/database.rb', line 254

def replicate_to other_db
  raise ArgumentError, "must provide a CouchReset::Database" unless other_db.kind_of?(CouchRest::Database)
  CouchRest.post "#{@host}/_replicate", :target => other_db.root, :source => name
end

#save(doc, bulk = false) ⇒ Object

DEPRECATION NOTICE



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# File 'lib/couchrest/core/database.rb', line 158

def save(doc, bulk=false)
  puts "CouchRest::Database's save method is being deprecated, please use save_doc instead"
  save_doc(doc, bulk)
end

#save_doc(doc, bulk = false) ⇒ Object

Save a document to CouchDB. This will use the _id field from the document as the id for PUT, or request a new UUID from CouchDB, if no _id is present on the document. IDs are attached to documents on the client side because POST has the curious property of being automatically retried by proxies in the event of network segmentation and lost responses.

If bulk is true (false by default) the document is cached for bulk-saving later. Bulk saving happens automatically when #bulk_save_cache limit is exceded, or on the next non bulk save.



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# File 'lib/couchrest/core/database.rb', line 127

def save_doc(doc, bulk = false)
  if doc['_attachments']
    doc['_attachments'] = encode_attachments(doc['_attachments'])
  end
  if bulk
    @bulk_save_cache << doc
    return bulk_save if @bulk_save_cache.length >= @bulk_save_cache_limit
    return {"ok" => true} # Compatibility with Document#save
  elsif !bulk && @bulk_save_cache.length > 0
    bulk_save
  end
  result = if doc['_id']
    slug = escape_docid(doc['_id'])        
    CouchRest.put "#{@uri}/#{slug}", doc
  else
    begin
      slug = doc['_id'] = @server.next_uuid
      CouchRest.put "#{@uri}/#{slug}", doc
    rescue #old version of couchdb
      CouchRest.post @uri, doc
    end
  end
  if result['ok']
    doc['_id'] = result['id']
    doc['_rev'] = result['rev']
    doc.database = self if doc.respond_to?(:database=)
  end
  result
end

#slow_view(funcs, params = {}) ⇒ Object Also known as: temp_view

POST a temporary view function to CouchDB for querying. This is not recommended, as you don’t get any performance benefit from CouchDB’s materialized views. Can be quite slow on large databases.



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# File 'lib/couchrest/core/database.rb', line 50

def slow_view(funcs, params = {})
  keys = params.delete(:keys)
  funcs = funcs.merge({:keys => keys}) if keys
  url = CouchRest.paramify_url "#{@uri}/_temp_view", params
  JSON.parse(RestClient.post(url, funcs.to_json, {"Content-Type" => 'application/json'}))
end

#to_s ⇒ Object

returns the database’s uri



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# File 'lib/couchrest/core/database.rb', line 27

def to_s
  @uri
end

#view(name, params = {}, &block) ⇒ Object

Query a CouchDB view as defined by a _design document. Accepts paramaters as described in wiki.apache.org/couchdb/HttpViewApi



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# File 'lib/couchrest/core/database.rb', line 62

def view(name, params = {}, &block)
  keys = params.delete(:keys)
  name = name.split('/') # I think this will always be length == 2, but maybe not...
  dname = name.shift
  vname = name.join('/')
  url = CouchRest.paramify_url "#{@uri}/_design/#{dname}/_view/#{vname}", params
  if keys
    CouchRest.post(url, {:keys => keys})
  else
    if block_given?
      @streamer.view("_design/#{dname}/_view/#{vname}", params, &block)
    else
      CouchRest.get url
    end
  end
end