Augmenting Datasources via “CreateContent.lua”

Incoming data can be manipulated via a script which is executed before EasyCatalog attempts to load data from a data source. A ‘createcontent.lua’ script, located in the data sources scripts folder,  is called immediately before data is loaded. The script is passed a ‘records’ variable which is a RECORDSET object.

Take this data for example:

simple example.xls

When loaded into EasyCatalog, with field 1 as the key, it looks like this:

When implementing the following ‘createcontent.lua’ script:

-- this can be used to access data source options
-- this_local =  DATASOURCE.get():getoption("locale", "US");

-- Rename an existing file
records:renamefield("Field 2", "f2");

-- Create a new field and add content
records:addfield("Regular Field");

for i = 1,records:size() do
   r = records:getrecord(i);
   r:field("Regular Field"):setcontent(i);
end

-- create a new tabular and add content
records:addfield("Tabular Field");
t = TABLE.new();
t:cell(1,1):setcontent("1");
t:cell(2,1):setcontent("2");
t:cell(3,1):setcontent("3");
t:cell(4,1):setcontent("4");

for i = 1,records:size() do
   r = records:getrecord(i);
   r:field("Tabular Field"):setcontent(t);
end
-- Remove a field
records:removefield("Field 3");

-- Duplicate each record and create a valid key
 for i = 1,records:size() do
   nr = records:duplicaterecord(i);
   nr:field("Field 1"):setcontent( nr:field("Field 1"):content() .. "-1");
end

The result after synchronizing is:

Notice the indicators on the fields that didn’t originate from the original data. Fields created in this way are treated as regular fields, with the exception of tabular fields which are stored in binary format within the snapshot file.

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