My first first showing my ability to create simple app using RoR/database/CSS/JQuery/AJAX technologies.
Use cases:
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user clicks on the grid and can create a spot that appears on the screen
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user can add a name for the spot (when no name supplied, the spot will have name with an ID number)
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spots can not interfere with each other
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user can move spots with drag-drop feature
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spots appear in the screen without page reload