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Queries Find: where: pluck and scope: Read More

1:1 embedded relationship: M:1 linked relationship(one_direction): child uses belongs_to parent uses has_many 1:M embedded relationship: M:1 embedded Read More

Mongoid: object-document-mapper(ODM) Mongoid Configuration: rails g mongoid:config Document: Documents are the core objects in Mongoid Mongoid::Docume Read More

#explain command pp db[:zips].find(:state => 'MD').explain #List all indexes: db[:zips].indexes.each do |index| p index #drop_one db[:zips].indexes.drop_one('state_1') #unique command d... Read More

GridFS - specification for storing and retrieving large files... images,audio file, video files... File system to store the chunks. Data is stored wit Read More

Normalization: ...... Relationships: One-to-One relationship: 1-to-many: many-to-many: Read More

Aggregation Framework: $project: a document stream by renaming, adding, or removing fields $group: $match: $unwind: Read More

MongoDB:以BSON(Binary JSON)方式存储数据 Mapping： SQL vs. Mongo(Sampe Query): MongoDB基础： MongoDB Ruby Driver Setup： mongo-ruby driver *gem update -system *gem Read More

NoSQL(Not Only SQL)入门： *没有Fixed Schema *没有关系型数据储存在系统中 * 在大数据方面NoSQL有更好的表现 * 支持unstructured data - 不同的NoSQL种类： 1. Key/Value 2.document: 3. Column: 4.Gr Read More

root to: 'xxx' 默认root路径 Nested Resource: content_tag: simple_format: Formats new lines as <br> Authentication: HTTP Sessions and cookies: HTTP is a st Read More