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--- transformations:iterate [2016/09/20 23:02] – dmitry
+++ transformations:iterate [2021/06/06 20:15] – craigt
@@ Line 1: / Line 1: @@
-===== Iterate =====
+{{ transformations:IterateAction.png}}
+====== ITERATE ======
+Category: Workflow / Internal \\
-This transformation calls another project once for each row in a table. Parameters of the called project are assigned using the table's fields.
+\\
+=====Description=====
+This action calls another project once for each row in a table. Parameters of the called project are assigned using the calling table's fields.\\
-This transformation is used for arranging loops in EasyMorph.
+\\
+=====Use cases=====
+//Iterate// is used to create ''FOR…EACH'' and ''FOR…NEXT'' types of loops within EasyMorph.
+\\
+=====Action settings=====
+^Setting^Description^
+|Module/Project to run<sup>*</sup>|Select whether to call a module (within the current project), or an external project (.morph file), then select the\\ module, or browse to the project file.|
+|Iteration mode|Choose whether to just iterate the called module (or project) and //not// return any results, or iterate and return\\ a dataset.  Options:  //Iterate// or //Iterate and append results// (and select the Result table from the called module or project).|
+|Assign parameters|Select the parameters in the called module (or project) to pass values in with, and the associated columns<sup>*</sup> in the\\ calling dataset that contains the values being passed.|
+|When an iteration fails|Select how EasyMorph will handle situations when iterations fail.  Options:  //Halt project// or //Collect errors and continue//\\ (a new column, "Iteration errors", will be created in the dataset to capture any errors that occurred\\ during the iterations).|
+<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\
+\\
+=====Remarks=====
+Appending the result datasets is similar to the [[transformations:append|Append another table]] action. Columns with the same name are concatenated into one column while columns with unique names are extended with empty cells.\\
+To create a ''FOR...NEXT'' type of loop, generate a sequence of numbers from 1 to N using the [[transformations:sequence|Sequence]] action, then iterate across the sequence using //Iterate//.\\
+\\
+=====Examples=====
+**Iterate** — do not return anything from the iterated module, i.e. just run it one or several times.
+{{  https://easymorph.com/images/learn/iterate-mode1.png  }}
+\\ \\
+**Iterate and append results** — run the module one or several times, return a table (the result dataset) from each iteration, and append all result datasets into one, which becomes the output of the "Iterate" action.
+{{  https://easymorph.com/images/learn/iterate-mode2.png  }}
+\\
+=====More examples=====
+Read [[http://easymorph.com/learn/iterations.html|Iterations and loops in EasyMorph]] for more details regarding this action.
+\\
+=====See also=====
+  * [[transformations:iteratecolumns|Iterate columns]]
+  * [[transformations:iteratetable|Iterate table]]
-Read [[http://blog.easymorph.com/2015/06/iterations-and-loops-in-easymorph.html|Iterations and loops in EasyMorph]] to understand this transformation.