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Support mapping of post IDs within content

v0.8 of oik-clone is planned to support the mapping of post IDs within content. This means that post IDs used in the source content will be altered to the post IDs of the target content.

Requirements

  • Target to map source post IDs to target post IDs within post content
  • Post content fields supported to include: post_content, post_excerpt, post_title and (possibly) post_content_filtered
  • Mapping should also be performed on postmeta fields which support links and/or shortcode expansion: text, textarea and other specialized fields
  • Mapping to be performed against integers which can be identified as IDs by the context in which they’re used; parameters to shortcodes, within links.
  • Optional mapping of source to target URLs
  • Ability to prevent mapping, for certain edge cases

Example

Suppose the post content contains the [gallery] shortcode using the ids= parameter. which contains a sequence of post IDs of the attached images to display. Each of the source image’s post IDs will need to be mapped to a different target post ID. So “gallery ids=s1,s2,s3″ will become “gallery ids=t1,t2,t3″ Note: I’ve used prefixes to the post IDs to prevent mapping when this requirement gets cloned.

Other examples

There are zillions of shortcodes which use IDs to identify the content to be included or excluded. Here are just a few examples, again using sn for post IDs and http://example.com for the source domain which may also need to be mapped.

[bw_link s1]
[nivo ids=s1,s2,s3]
 

<a href="http://example.com?p=s1">Link to s1 on http://example.com</li>
 
And here are examples where we should not perform mapping since the post IDs are “out of context”

<a href="http://elsewhere.com?p=s1">Link to a different s1 on another domain</li>
I have been thinking about addressing this problem for nearly s2 years now.
[bw_pages posts_per_page=s3]
 
There are also examples where we don’t want mapping

e.g. The source of this page is http://example.com/?p=s1
It has been cloned to http://example.biz/?p=t1
 

Proposed solution

Source
  • Parse for IDs in the content
  • For each ID found determine the target mapping
  • Include this in the ‘mapping’ array
Target
  • Parse for IDs in the content
  • For each ID found lookup the target mapping
  • Verify the target mapping
  • Apply the mapping to the content
The behaviour when the mapping cannot be completed is currently unspecified.

Exclusions

The proposed solution doesn’t take into account all the other instances where unique IDs are used to identify content:

  • IDs associated with taxonomies
  • IDs associated with users
  • IDs associated with WordPress Multisite blogs
  • IDs associated with Comments
  • IDs which reference content in custom tables
  • IDs stored in the options table

The proposed solution doesn’t cater for logic which ensures that slug names are unique

oik-clone – Technical requirements

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