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POSuggest OOP analysis/design - break my procedural habits
 

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  1. POSuggest OOP analysis/design - break my procedural habits
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    <p>I would like to use OOP/OOD as an exercise for a small project, but I often find myself using a procedural approach when coding. I use Python in combination with Flask (web framework)</p> <p>In essence my app is a kind of spider that reads an rss feed for new movie releases. For each new movie release it uses the imdb link to gather information from two different web services (imdbapi and TMDb) regarding plot, year, genre, poster and info like that. If the preferred service cannot provide the information, then use the other service. Finally save all the info in a db. I then use Flask to present the information on a website</p> <p>I have created a Spider class for now. It contains the following methods (code removed for clarity):</p> <pre><code>class Spider(): """ Spider Class """ def __init__(self, rssfeed): def run_update(self): movie_list = self.get_entries_from_feed() self.get_imdb_json(movie_list) def get_entries_from_feed(self): """ reads an rss feed and return a list of lists with imdb id, title, and added date time """ def get_imdb_json(self, movie_list): """ get json data from imdbapi based on list with imdb id""" if not in db: save_to_db def save_to_db(self, key, nzb_title, added, data): """ save entry to db from json data""" </code></pre> <p>The "problem" is that I use the <strong>run_update()</strong> method to carry out all the steps in a procedural way. I also find the design inflexible. E.g if I can't get movie information for one service i'd like to try the other service, but this is not very easy to implement in the current format.</p> <p>What I have thought about is to create a Movie class, representing each movie found in the rssfeed. Maybe also to create classes for each of the services I use for gathering information about each movie, imdbapi and TMDb?</p> <p>So, how would you go about and design an app like this in an OOP/OOD fashion? I find it a little hard to identify classes, when we are beyond the simple examples used in text books - like cars, books, fruits and etc.</p>
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    1. CONot a solution, but a general suggestion on OO. I've always found using (so called) "real world" examples like cars e.t.c. when explaining OO just about as confusing as using bags to explain sets. If you make sure not apply the individual solutions too dogmatically you might want to look up some tutorial/book on design patterns; I remember finding at least some of them quite enlightening examples of how the kind of polymorphism used by OO systems can help you express the points at which your program can change and allow you to change the behaviour of your program in a modular fashion.
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      1. USTilo Wiklund
 

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