Hi John,

Thansk for the feedback.  Righto, I saw abundant use of "trans" in core galaxy 
code; and problem is I'd wanted access from a tool wrapper's python code.  
Basically I'm trying to get more out of .loc files, for example this field 
specification for blast report data:

   #value       type    subtype sort    filter  default min     max     choose  
   # Remember to edit tool_data_table_conf.xml for column spec!
   length       numeric int     1       1                               1       
Alignment length
   qstart       numeric int     1       1                               1       
Alignment start in query
   qend numeric int     1       1                               1       
Alignment end in query
   sstart       numeric int     1       1                               1       
Alignment start in subject
   send numeric int     1       1                               1       
Alignment end in subject
   qseq text    atgc    0       1                               1       Aligned 
part of query sequence
   sseq text    atgc    0       1                               1       Aligned 
part of subject sequence
   mseq text    atgc    0       1                               1       
Alignment, matched part
   pident       numeric float   1       1       97      90      100     1       
Percentage of identical matches

This data is being accessed in our tool xml code via a too_data_table entry and 
is handily providing field lists for sorting, filtering, and searching input 

In our python code I'd like to just say
    blastfieldspec = app.tool_data_tables[ 'blast_report_fields' ]

And then go to town on sorting, filtering, validation etc. as desired in 
python, using this spec.  I don't want the python code to be specifying the 
.loc path directly (which I have to do now), I'd much rather take advantage of 
what tool_data_tables could provide.

Our second desired use of tool_data_tables info is a case where some tools 
would be making use of 3rd party datasets that another tool manages.  We want 
to set up a tool/system that manages 3rd party reference databases (e.g. for 
particular specialized gene "universal target" databases like Chaperonin cpn60 
or Legionella mip).  This system would periodically get and process fasta data 
online from sources listed in a .loc file.  We'd process and use these 
databases in pulldown menus, but each of these reference database will need 
management through a Galaxy interface via a plugin tool I guess.  Someone has 
done a prototype for this for database specific to NCBI.  We'd target other 
niche data sources.  I realise another hurdle is getting modified .loc file 
info refreshed back into galaxy without having to stop/restart the server.  
Hoping an extension to the tool_data_tables class could do this too.




Message: 1
Date: Fri, 10 Jan 2014 16:56:56 -0800
From: "Dooley, Damion" <damion.doo...@bccdc.ca>
To: "galaxy-dev@lists.bx.psu.edu" <galaxy-dev@lists.bx.psu.edu>
Subject: [galaxy-dev] referring to tool_data_tables[] structure

Content-Type: text/plain; charset="us-ascii"

I've seen

   $__app__.tool_data_tables[ 'all_fasta' ].get_fields() )[0][-1]

in tool xml templates.  Is there a way I can access the tool_data_tables 
structure from python code too?

I see all the initialization stuff happening in 
But not seeing where one can access any of these app variables?




Message: 2
Date: Fri, 10 Jan 2014 20:42:50 -0600
From: John Chilton <chil...@msi.umn.edu>
To: "Dooley, Damion" <damion.doo...@bccdc.ca>
Cc: "galaxy-dev@lists.bx.psu.edu" <galaxy-dev@lists.bx.psu.edu>
Subject: Re: [galaxy-dev] referring to tool_data_tables[] structure
Content-Type: text/plain; charset=ISO-8859-1

Just to clarify do you want to access them from Galaxy web server code
or from a Galaxy tool wrapper written in Python?

Nearly every part of the Galaxy source code has access to app and
everything inside of it, for instance all controller methods take in a
trans variable that contains a reference to app (trans.app).

I suspect you want to access it from a tool wrapper though? This is
not possible. If this is the case - what are you hoping to accomplish?
Do you want to access to the all_fasta data table information in the

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