Commit a2a536b5 by David Ormsbee

Add docs sketching data formats.

parent ae681a52
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# -*- coding: utf-8 -*-
#
# edX Docs documentation build configuration file, created by
# sphinx-quickstart on Mon Feb 25 16:55:22 2013.
#
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#
# Note that not all possible configuration values are present in this
# autogenerated file.
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# serve to show the default.
import sys, os
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
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# -- General configuration -----------------------------------------------------
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#needs_sphinx = '1.0'
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# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx.ext.intersphinx', 'sphinx.ext.pngmath', 'sphinx.ext.mathjax']
# Add any paths that contain templates here, relative to this directory.
templates_path = ['_templates']
# The suffix of source filenames.
source_suffix = '.rst'
# The encoding of source files.
#source_encoding = 'utf-8-sig'
# The master toctree document.
master_doc = 'index'
# General information about the project.
project = u'edX Docs'
copyright = u'2013, edX Team'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
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#today_fmt = '%B %d, %Y'
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exclude_patterns = ['_build']
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#default_role = None
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#add_function_parentheses = True
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# unit titles (such as .. function::).
#add_module_names = True
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# output. They are ignored by default.
#show_authors = False
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pygments_style = 'sphinx'
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#modindex_common_prefix = []
# -- Options for HTML output ---------------------------------------------------
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#html_theme_path = []
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html_static_path = ['_static']
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#html_last_updated_fmt = '%b %d, %Y'
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# typographically correct entities.
#html_use_smartypants = True
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#html_sidebars = {}
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# template names.
#html_additional_pages = {}
# If false, no module index is generated.
#html_domain_indices = True
# If false, no index is generated.
#html_use_index = True
# If true, the index is split into individual pages for each letter.
#html_split_index = False
# If true, links to the reST sources are added to the pages.
#html_show_sourcelink = True
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#html_show_sphinx = True
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#html_file_suffix = None
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htmlhelp_basename = 'edXDocsdoc'
# -- Options for LaTeX output --------------------------------------------------
latex_elements = {
# The paper size ('letterpaper' or 'a4paper').
#'papersize': 'letterpaper',
# The font size ('10pt', '11pt' or '12pt').
#'pointsize': '10pt',
# Additional stuff for the LaTeX preamble.
#'preamble': '',
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, documentclass [howto/manual]).
latex_documents = [
('index', 'edXDocs.tex', u'edX Docs Documentation',
u'edX Team', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
#latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
#latex_use_parts = False
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#latex_show_pagerefs = False
# If true, show URL addresses after external links.
#latex_show_urls = False
# Documents to append as an appendix to all manuals.
#latex_appendices = []
# If false, no module index is generated.
#latex_domain_indices = True
# -- Options for manual page output --------------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
('index', 'edxdocs', u'edX Docs Documentation',
[u'edX Team'], 1)
]
# If true, show URL addresses after external links.
#man_show_urls = False
# -- Options for Texinfo output ------------------------------------------------
# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
# dir menu entry, description, category)
texinfo_documents = [
('index', 'edXDocs', u'edX Docs Documentation',
u'edX Team', 'edXDocs', 'One line description of project.',
'Miscellaneous'),
]
# Documents to append as an appendix to all manuals.
#texinfo_appendices = []
# If false, no module index is generated.
#texinfo_domain_indices = True
# How to display URL addresses: 'footnote', 'no', or 'inline'.
#texinfo_show_urls = 'footnote'
# Example configuration for intersphinx: refer to the Python standard library.
intersphinx_mapping = {'http://docs.python.org/': None}
######################
Discussion Forums Data
######################
Discussions in edX are stored in a MongoDB database as collections of JSON documents.
The primary collection holding all posts and comments written by users is `contents`. There are two types of objects stored here, though they share much of the same structure. A `CommentThread` represents a comment that opens a new thread -- usually a student question of some sort. A `Comment` is a reply in the conversation started by a `CommentThread`.
*****************
Shared Attributes
*****************
The attributes that `Comment` and `CommentThread` objects share are listed below.
`_id`
-----
The 12-byte MongoDB unique ID for this collection. Like all MongoDB IDs, they are monotonically increasing and the first four bytes are a timestamp.
`_type`
-------
`CommentThread` or `Comment` depending on the type of object.
`anonymous`
-----------
If true, this `Comment` or `CommentThread` will show up as written by anonymous, even to those who have moderator privileges in the forums.
`anonymous_to_peers`
--------------------
The idea behind this field was that `anonymous_to_peers = true` would make the the comment appear anonymous to your fellow students, but would allow the course staff to see who you were. However, that was never implemented in the UI, and only `anonymous` is actually used. The `anonymous_to_peers` field is always false.
`at_position_list`
------------------
No longer used. Child comments (replies) are just sorted by their `created_at` timestamp instead.
`author_id`
-----------
The user who wrote this. Corresponds to the user IDs we store in our MySQL database as `auth_user.id`
`body`
------
Text of the comment in Markdown. UTF-8 encoded.
`course_id`
-----------
The full course_id of the course that this comment was made in, including org and run. This value can be seen in the URL when browsing the courseware section. Example: `BerkeleyX/Stat2.1x/2013_Spring`
`created_at`
------------
Timestamp in UTC. Example: `ISODate("2013-02-21T03:03:04.587Z")`
`updated_at`
------------
Timestamp in UTC. Example: `ISODate("2013-02-21T03:03:04.587Z")`
`votes`
-------
Both `CommentThread` and `Comment` objects support voting. `Comment` objects that are replies to other comments still have this attribute, even though there is no way to actually vote on them in the UI. This attribute is a dictionary that has the following inside:
* `up` = list of User IDs that up-voted this comment or thread.
* `down` = list of User IDs that down-voted this comment or thread (no longer used).
* `up_count` = total upvotes received.
* `down_count` = total downvotes received (no longer used).
* `count` = total votes cast.
* `point` = net vote, now always equal to `up_count`.
A user only has one vote per `Comment` or `CommentThread`. Though it's still written to the database, the UI no longer displays an option to downvote anything.
*************
CommentThread
*************
The following fields are specific to `CommentThread` objects. Each thread in the forums is represented by one `CommentThread`.
`closed`
--------
If true, this thread was closed by a forum moderator/admin.
`comment_count`
---------------
The number of comment replies in this thread. This includes all replies to replies, but does not include the original comment that started the thread. So if we had::
CommentThread: "What's a good breakfast?"
* Comment: "Just eat cereal!"
* Comment: "Try a Loco Moco, it's amazing!"
* Comment: "A Loco Moco? Only if you want a heart attack!"
* Comment: "But it's worth it! Just get a spam musubi on the side."
In that exchange, the `comment_count` for the `CommentThread` is `4`.
`commentable_id`
----------------
We can attach a discussion to any piece of content in the course, or to top level categories like "General" and "Troubleshooting". When the `commentable_id` is a high level category, it's specified in the course's policy file. When it's a specific content piece (e.g. `600x_l5_p8`, meaning 6.00x, Lecture Sequence 5, Problem 8), it's taken from a discussion module in the course.
`last_activity_at`
------------------
Timestamp in UTC indicating the last time there was activity in the thread (new posts, edits, etc). Closing the thread does not affect the value in this field.
`tags_array`
------------
Meant to be a list of tags that were user definable, but no longer used.
`title`
-------
Title of the thread, UTF-8 string.
*******
Comment
*******
The following fields are specific to `Comment` objects. A `Comment` is a reply to a `CommentThread` (so an answer to the question), or a reply to another `Comment` (a comment about somebody's answer). It used to be the case that `Comment` replies could nest much more deeply, but we later capped it at just these three levels (question, answer, comment) much in the way that StackOverflow does.
`endorsed`
----------
Boolean value, true if a forum moderator or instructor has marked that this `Comment` is a correct answer for whatever question the thread was asking. Exists for `Comments` that are replies to other `Comments`, but in that case `endorsed` is always false because there's no way to endorse such comments through the UI.
`comment_thread_id`
-------------------
What `CommentThread` are we a part of? All `Comment` objects have this.
`parent_id`
-----------
The `parent_id` is the `_id` of the `Comment` that this comment was made in reply to. Note that this only occurs in a `Comment` that is a reply to another `Comment`; it does not appear in a `Comment` that is a reply to a `CommentThread`.
`parent_ids`
------------
The `parent_ids` attribute appears in all `Comment` objects, and contains the `_id` of all ancestor comments. Since the UI now prevents comments from being nested more than one layer deep, it will only ever have at most one element in it. If a `Comment` has no parent, it's an empty list.
.. edX documentation master file, created by
sphinx-quickstart on Fri Nov 2 15:43:00 2012.
You can adapt this file completely to your liking, but it should at least
contain the root `toctree` directive.
common-lib.rst
djangoapps.rst
xml_formats.rst
edX Data Formats
================
Internal Formats
----------------
These document describe how we store course structure, student state/progress, and events internally. Useful for developers or researchers who interact with our raw data exports.
.. toctree::
:maxdepth: 2
sql_schema.rst
discussion_data.rst
tracking_logs.rst
Indices and tables
==================
.. * :ref:`genindex`
* :ref:`modindex`
* :ref:`search`
#############
Tracking Logs
#############
* Tracking logs are made available as separate tar files on S3 in the course-data bucket.
* They are represented as JSON files that catalog all user interactions with the site.
* To avoid filename collisions the tracking logs are organized by server name, where each directory corresponds to a server where they were stored.
*************
Common Fields
*************
.. list-table::
:widths: 10 40 10 25
:header-rows: 1
* - field
- details
- type
- values/format
* - `username`
- username of the user who triggered the event, empty string for anonymous events (not logged in)
- string
-
* - `session`
- key identifying the user's session, may be undefined
- string
- 32 digits key
* - `time`
- GMT time the event was triggered
- string
- `YYYY-MM-DDThh:mm:ss.xxxxxx`
* - `ip`
- user ip address
- string
-
* - `agent`
- users browser agent string
- string
-
* - `page`
- page the user was visiting when the event was generated
- string
- `$URL`
* - event_source
- event source
- string
- `browser`, `server`
* - `event_type`
- type of event triggered, values depends on `event_source`
- string
- *more details listed below*
* - `event`
- specifics of the event (dependenty of the event_type)
- string/json
- *the event string may encode a JSON record*
*************
Event Sources
*************
The `event_source` field identifies whether the event originated in the browser (via javascript) or on the server (during the processing of a request).
Server Events
=============
.. list-table::
:widths: 20 10 10 10 50
:header-rows: 1
* - event_type
- event fields
- type
- values/format
- details
* - `show_answer`
- `problem_id`
- string
-
- id of the problem being shown. Ex: `i4x://MITx/6.00x/problem/L15:L15_Problem_2`
* - `save_problem_check`
- `problem_id`
- string
-
- id of the problem being shown
* -
- `success`
- string
- correct, incorrect
- whether the problem was correct
* -
- `attempts`
- integer
- number of attempts
-
* -
- `correct_map`
- string/json
-
- see details below
* -
- `state`
- string/json
-
- current problem state
* -
- `answers`
- string/json
-
- students answers
* -
- `reset_problem`
- problem_id
- string
- id of the problem being shown
`correct_map` details
---------------------
.. list-table::
:widths: 15 10 15 10
:header-rows: 1
* - correct_map fields
- type
- values/format
- null allowed?
* - hint
- string
-
-
* - hintmode
- boolean
-
- yes
* - correctness
- string
- correct, incorrect
-
* - npoints
- integer
-
- yes
* - msg
- string
-
-
* - queuestate
- string/json
- keys: key, time
-
Browser Events
==============
.. list-table::
:widths: 10 10 8 12 20 10
:header-rows: 1
* - event_type
- fields
- type
- values/format
- details
- example
* - `book`
- `type`
- string
- `gotopage`
-
-
* -
- `old`
- integer
- `$PAGE`
- from page number
- `2`
* -
- `new`
- integer
- `$PAGE`
- to page number
- `25`
* - `book`
- `type`
- string
- `nextpage`
-
-
* -
- new
- integer
- `$PAGE`
- next page number
- `10`
* - `page_close`
- *empty*
- string
-
- 'page' field indicates which page was being closed
-
* - play_video
- `id`
- string
-
- edX id of the video being watched
- `i4x-HarvardX-PH207x-video-Simple_Random_Sample`
* -
- code
- string
-
- youtube id of the video being watched
- `FU3fCJNs94Y`
* -
- `currentTime`
- float
-
- time the video was paused at, in seconds
- `1.264`
* -
- `speed`
- string
- `0.75, 1.0, 1.25, 1.50`
- video speed being played
- `"1.0"`
* - `pause_video`
- `id`
- string
-
- edX id of the video being watched
-
* -
- `code`
- string
-
- youtube id of the video being watched
-
* -
- `currentTime`
- float
-
- time the video was paused at
-
* -
- `speed`
- string
- `0.75, 1.0, 1.25, 1.50`
- video speed being played
-
* - `problem_check`
- *none*
- string
-
- event field contains the values of all input fields from the problem being checked (in the style of GET parameters (`key=value&key=value`))
-
* - `problem_show`
- `problem`
- string
-
- id of the problem being checked
-
* - `seq_goto`
- `id`
- string
-
- edX id of the sequence
-
* -
- `old`
- integer
-
- sequence element being jumped from
- `3`
* -
- `new`
- integer
-
- sequence element being jumped to
- `5`
* - `seq_next`
- `id`
- string
-
- edX id of the sequence
-
* -
- `old`
- integer
-
- sequence element being jumped from
- `4`
* -
- `new`
- integer
-
- sequence element being jumped to
- `6`
* - `rubric_select`
- `location`
- string
-
- location of the rubric's problem
- `i4x://MITx/6.00x/problem/L15:L15_Problem_2`
* -
- `category`
- integer
-
- category number of the rubric selection
-
* -
- `value`
- integer
-
- value selected within the category
-
* - `(oe / peer_grading / staff_grading)`
`_show_problem`
- `location`
- string
-
- the location of the problem whose prompt we're showing
-
* - `(oe / peer_grading / staff_grading)`
`_hide_problem`
- `location`
- string
-
- the location of the problem whose prompt we're hiding
-
* - `oe_show_full_feedback`
- *empty*
-
-
- the page where they're showing full feedback is already recorded
-
* - `oe_show_respond_to_feedback`
- *empty*
-
-
- the page where they're showing the feedback response form is already recorded
-
* - `oe_feedback_response_selected`
- `value`
- integer
-
- the value selected in the feedback response form
-
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